From 950f4215d8e84347516fd68bbd2ee53c71bf631b Mon Sep 17 00:00:00 2001
From: Michael Hohenstein <michael@hohenste.in>
Date: Thu, 15 Feb 2024 16:53:03 +0100
Subject: [PATCH] [hard] footprint assignment and some Part Ordering numbers

---
 documentation/chap/hardware/schematics.tex |    2 +-
 hardware/afe.kicad_sch                     | 1377 ++++++++++++++------
 hardware/parallax.kicad_sch                |   90 ++
 3 files changed, 1067 insertions(+), 402 deletions(-)

diff --git a/documentation/chap/hardware/schematics.tex b/documentation/chap/hardware/schematics.tex
index 4279d1b..39f7eb2 100644
--- a/documentation/chap/hardware/schematics.tex
+++ b/documentation/chap/hardware/schematics.tex
@@ -19,7 +19,7 @@ \subsection{Analog Front-End}
 	\item \textbf{Calibration}: Some parts of the circuit may compensate for any inaccuracies introduced by the analog components or variations in manufacturing.
 \end{itemize}
 
-At first some global decisions have to be made: The Input ranges (and how many of them are going to be available) and the 
+At first some global decisions have to be made: Which input ranges (and how many) are going to be available.
 
 \todo[inline]{Explain how the schematics diagram works, how all values were calculated and why some test pins were placed on their locations. Maybe also write something about the pcb layout?}
 
diff --git a/hardware/afe.kicad_sch b/hardware/afe.kicad_sch
index 7569ba8..9738f0a 100644
--- a/hardware/afe.kicad_sch
+++ b/hardware/afe.kicad_sch
@@ -191,6 +191,101 @@
         )
       )
     )
+    (symbol "Connector:Conn_01x02_Pin" (pin_names (offset 1.016) hide) (in_bom yes) (on_board yes)
+      (property "Reference" "J" (at 0 2.54 0)
+        (effects (font (size 1.27 1.27)))
+      )
+      (property "Value" "Conn_01x02_Pin" (at 0 -5.08 0)
+        (effects (font (size 1.27 1.27)))
+      )
+      (property "Footprint" "" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "Datasheet" "~" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_locked" "" (at 0 0 0)
+        (effects (font (size 1.27 1.27)))
+      )
+      (property "ki_keywords" "connector" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_description" "Generic connector, single row, 01x02, script generated" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_fp_filters" "Connector*:*_1x??_*" (at 0 0 0)
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+            (xy 0.8636 -2.54)
+          )
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+          (fill (type none))
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+          (stroke (width 0.1524) (type default))
+          (fill (type outline))
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+          (fill (type outline))
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+      (property "Value" "TestPoint" (at 0 5.08 0)
+        (effects (font (size 1.27 1.27)))
+      )
+      (property "Footprint" "" (at 5.08 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
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@@ -309,108 +404,210 @@
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@@ -574,19 +798,31 @@
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-  (text "voltage follower as impedance changer" (at 55.88 102.87 0)
+  (text "voltage follower as impedance converter" (at 55.88 102.87 0)
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   )
-  (text "250 KHz Tiefpass-Filter:\n\nf = 1 / (2 * pi * R * C)\n  = 1 / (2 * pi * 680 * 10e-9)\n  = 234051 ca. 250 KHz"
+  (text "250 KHz lowpass-Filter:\n\nf = 1 / (2 * pi * R * C)\n  = 1 / (2 * pi * 680 * 10e-9)\n  = 234051 ca. 250 KHz"
     (at 201.93 93.98 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 1e237671-e7a0-47eb-abe9-c9ff51298c79)
   )
-  (text "TODO:\n- Tiefpass Filter behalten oder entfernen?\n- Test-Pads hinzufügen!"
+  (text "TODO:\n- Tiefpass Filter behalten oder entfernen?\n- Analoger Multiplexer: Trimer-Poti am Common GND Terminal hinzufügen?\n- Nach erfolgreichem Aufbau Test-Punkte verkleinern (nicht entfernen, nur kleinerer footprint)"
     (at 29.21 27.94 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 22629850-bf50-4684-8924-653488409d38)
@@ -862,18 +1182,31 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 3853026c-6a36-489d-a5af-38c678c663d0)
   )
-  (text "reference voltage selection" (at 55.88 116.84 0)
+  (text "ADC Inputs of Raspberry Pi Pico:\nhttps://forums.raspberrypi.com/viewtopic.php?t=344780\npost 598\ninput impedance: 100K\ninput capacitance: 1pF"
+    (at 226.06 29.21 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 397bd46a-16fe-4bd6-92f7-c87bc7e1478b)
+  )
+  (text "reference voltage selection" (at 85.09 115.57 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 3d38fa15-ab57-4744-a6bf-2d702d9d00c6)
   )
-  (text "analog multiplexer" (at 144.78 152.4 0)
+  (text "analog multiplexer" (at 144.78 161.29 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 3e8a32a6-bd8f-44f5-a69a-055fe147885e)
   )
-  (text "Clamping diode to prevent\nover- / undervoltage" (at 234.95 49.53 0)
+  (text "Clamping diode to prevent\nover- / undervoltage" (at 229.87 53.34 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 4196104f-ce69-4cd5-8386-819ab5e7d8fa)
   )
+  (text "TODO: Widerstände / kondensatoren berechnen" (at 29.21 17.78 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 7361363c-2853-4092-9237-9e928b685f22)
+  )
+  (text "AC/DC Coupling\nTODO: use analog switch instead?" (at 45.72 62.23 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 848d04f6-a2ea-4e3c-8407-730ac0d30fcf)
+  )
   (text "Frequency compensated attenuator" (at 78.74 44.45 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 86907fc5-3e0b-4705-86b1-cfa006a4ed04)
@@ -882,33 +1215,33 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 8f8581df-239a-4437-a404-f624973d86ee)
   )
-  (text "amplification selection" (at 158.75 116.84 0)
+  (text "amplification selection" (at 161.29 115.57 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid ae4b0ac1-ee89-4428-a855-51d806cbad14)
   )
+  (text "Clamping diode to prevent\nover- / undervoltage" (at 129.54 52.07 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid bb6be37f-f700-45ac-b743-0f49784e793a)
+  )
   (text "Analog Front-End" (at 186.69 190.5 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid cf2a4159-dc0a-4a42-b340-6e78f567d17f)
   )
-  (text "Spannungsversorgung Op-Amp" (at 238.76 121.92 0)
+  (text "Filter Supply-Voltage fpr the Op-Amp" (at 234.95 121.92 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid dc52d1a1-165f-46a4-aff4-955ae5f98211)
   )
-  (text "Clamping diode to prevent\nover- / undervoltage" (at 121.92 48.26 0)
-    (effects (font (size 1.27 1.27)) (justify left bottom))
-    (uuid e116ea8f-4be8-4d0b-843e-8fc23ec4379e)
-  )
   (text "stabilize reference voltage\n2 * 100nf is cheaper than\n  a single 200nf"
     (at 21.59 114.3 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid ff9be45f-cd3a-40d2-8870-122229c357e9)
   )
 
-  (hierarchical_label "analog_in" (shape input) (at 55.88 50.8 180) (fields_autoplaced)
+  (hierarchical_label "analog_in" (shape input) (at 40.64 50.8 180) (fields_autoplaced)
     (effects (font (size 1.27 1.27)) (justify right))
     (uuid 9df9a9af-05d8-48e9-ab41-81fd7249374c)
   )
-  (hierarchical_label "Mul_B" (shape input) (at 182.88 128.27 0) (fields_autoplaced)
+  (hierarchical_label "Mul_B" (shape input) (at 182.88 137.16 0) (fields_autoplaced)
     (effects (font (size 1.27 1.27)) (justify left))
     (uuid cbb9070f-6fe2-4097-b4e7-a4471bd2c670)
   )
@@ -916,24 +1249,100 @@
     (effects (font (size 1.27 1.27)) (justify left))
     (uuid cf4a3c76-f037-48af-a4eb-59da333e3ab1)
   )
-  (hierarchical_label "Mul_A" (shape input) (at 182.88 125.73 0) (fields_autoplaced)
+  (hierarchical_label "Mul_A" (shape input) (at 182.88 134.62 0) (fields_autoplaced)
     (effects (font (size 1.27 1.27)) (justify left))
     (uuid fdfbe73e-a988-4597-b1f2-c7dd86b68da4)
   )
 
-  (symbol (lib_id "power:GND") (at 241.3 74.93 0) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+  (symbol (lib_id "Connector:TestPoint") (at 96.52 92.71 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 0e1e7825-6f43-4e5d-b49e-cf577efd08aa)
+    (property "Reference" "TP2" (at 99.06 88.138 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Value" "TestPoint" (at 99.06 90.678 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 101.6 92.71 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 101.6 92.71 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid ee11e595-82ef-4329-a587-83697077514a))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "TP2") (unit 1)
+        )
+      )
+    )
+  )
+
+  (symbol (lib_id "Connector:Conn_01x02_Pin") (at 53.34 55.88 90) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 101da865-c0df-4b47-86c7-b5c1c678abee)
+    (property "Reference" "J2" (at 57.15 53.975 90)
+      (effects (font (size 1.27 1.27)) (justify right))
+    )
+    (property "Value" "Conn_01x02_Pin" (at 57.15 56.515 90)
+      (effects (font (size 1.27 1.27)) (justify right))
+    )
+    (property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" (at 53.34 55.88 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 53.34 55.88 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid c28ef683-8b53-437b-940b-3bdd260eb579))
+    (pin "2" (uuid 4eaaa970-a5be-48b3-9d62-13d6ff17db91))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "J2") (unit 1)
+        )
+      )
+    )
+  )
+
+  (symbol (lib_id "power:GND") (at 133.35 59.69 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no)
+    (uuid 10873f0e-cf02-4630-93eb-752fdaf74e07)
+    (property "Reference" "#PWR06" (at 133.35 66.04 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Value" "GND" (at 129.54 59.69 0)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Footprint" "" (at 133.35 59.69 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "" (at 133.35 59.69 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid df1be50b-7d6a-4c65-a675-92f070ea9f88))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "#PWR06") (unit 1)
+        )
+      )
+    )
+  )
+
+  (symbol (lib_id "power:GND") (at 232.41 62.23 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no)
     (uuid 16d550ac-44e6-4a3f-9a82-28b54c1ea922)
-    (property "Reference" "#PWR014" (at 241.3 81.28 0)
+    (property "Reference" "#PWR014" (at 232.41 68.58 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "GND" (at 241.3 80.01 0)
+    (property "Value" "GND" (at 228.6 62.23 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 241.3 74.93 0)
+    (property "Footprint" "" (at 232.41 62.23 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 241.3 74.93 0)
+    (property "Datasheet" "" (at 232.41 62.23 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid fce27d21-c583-4ce7-afd6-8a3a21817b59))
@@ -946,19 +1355,44 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 134.62 121.92 0) (unit 1)
+  (symbol (lib_id "Connector:TestPoint") (at 63.5 50.8 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 18fbb75e-5dfd-4e06-bd37-daa38a9ed148)
+    (property "Reference" "TP9" (at 66.04 46.228 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Value" "TestPoint" (at 66.04 48.768 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 68.58 50.8 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 68.58 50.8 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid bb14ce22-3384-4e35-9841-24b0c0c80d67))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "TP9") (unit 1)
+        )
+      )
+    )
+  )
+
+  (symbol (lib_id "Device:R") (at 123.19 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 2208a072-4b74-43df-8562-fdf505c95ec5)
-    (property "Reference" "R7" (at 133.35 116.84 0)
+    (property "Reference" "R7" (at 121.92 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 134.62 123.19 90)
+    (property "Value" "R" (at 123.19 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 132.842 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 121.412 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 134.62 121.92 0)
+    (property "Datasheet" "~" (at 123.19 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 9f329fa3-93d6-492a-b26c-b765a8c74545))
@@ -987,6 +1421,9 @@
     (property "Datasheet" "http://ww1.microchip.com/downloads/en/DeviceDoc/21733j.pdf" (at 71.12 92.71 0)
       (effects (font (size 1.27 1.27)) hide)
     )
+    (property "Reichelt Part-Number" "MCP 6002-I/SN" (at 71.12 92.71 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
     (pin "2" (uuid efec5865-3a2c-48ca-ab2c-c2d55fde96ee))
     (pin "1" (uuid 2a4aa5a4-cc95-4472-a132-ac528170bca9))
     (pin "6" (uuid ea9aac6c-f52e-4699-a552-4080eb00c961))
@@ -1005,19 +1442,19 @@
     )
   )
 
-  (symbol (lib_id "power:+3V3") (at 53.34 81.28 0) (unit 1)
+  (symbol (lib_id "power:+3V3") (at 53.34 73.66 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 29aa7970-fbc2-4e7c-890d-49b48caec14e)
-    (property "Reference" "#PWR03" (at 53.34 85.09 0)
+    (property "Reference" "#PWR03" (at 53.34 77.47 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "+3V3" (at 53.34 76.2 0)
+    (property "Value" "+3V3" (at 53.34 68.58 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 53.34 81.28 0)
+    (property "Footprint" "" (at 53.34 73.66 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 53.34 81.28 0)
+    (property "Datasheet" "" (at 53.34 73.66 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 3e95924c-76c8-4051-ac18-53f816fb50f7))
@@ -1030,6 +1467,32 @@
     )
   )
 
+  (symbol (lib_id "Device:C") (at 54.61 45.72 90) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 29b90cde-bfa9-4c1a-9ea9-5984c6225fe6)
+    (property "Reference" "C9" (at 54.61 38.1 90)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Value" "100nF" (at 54.61 40.64 90)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder" (at 58.42 44.7548 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 54.61 45.72 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "2" (uuid 66dc18fb-5bce-4deb-81c9-735da3e47bfa))
+    (pin "1" (uuid c06f13d7-b4d5-4bbd-b70b-a4cdc1fd2d5a))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "C9") (unit 1)
+        )
+      )
+    )
+  )
+
   (symbol (lib_id "Device:R") (at 102.87 54.61 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 2b8b21c9-c315-41ba-9edf-e83ee4736b51)
@@ -1056,6 +1519,31 @@
     )
   )
 
+  (symbol (lib_id "Connector:TestPoint") (at 240.03 67.31 180) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 30242003-49bd-4a61-a3a7-136a1783f0c2)
+    (property "Reference" "TP5" (at 242.57 69.342 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+    )
+    (property "Value" "TestPoint" (at 242.57 71.882 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+    )
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 234.95 67.31 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 234.95 67.31 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid 6f0cca19-7989-4879-b321-325a33ef8a4d))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "TP5") (unit 1)
+        )
+      )
+    )
+  )
+
   (symbol (lib_id "power:GND") (at 43.18 100.33 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 36cd75ea-de37-4e61-9f83-05db36cb4c3c)
@@ -1081,19 +1569,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 129.54 121.92 0) (unit 1)
+  (symbol (lib_id "Device:R") (at 118.11 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 376e956e-0020-415b-a0c7-1a3835d9ebcf)
-    (property "Reference" "R5" (at 128.27 116.84 0)
+    (property "Reference" "R5" (at 116.84 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 129.54 123.19 90)
+    (property "Value" "R" (at 118.11 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 127.762 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 116.332 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 129.54 121.92 0)
+    (property "Datasheet" "~" (at 118.11 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 49e8f119-2a7f-450d-ad06-3fe5c6b2eae5))
@@ -1107,19 +1595,19 @@
     )
   )
 
-  (symbol (lib_id "power:+3V3") (at 113.03 134.62 0) (unit 1)
+  (symbol (lib_id "power:+3V3") (at 113.03 143.51 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 38e1eaf4-ca3c-44b5-8b0b-3a018f51feed)
-    (property "Reference" "#PWR04" (at 113.03 138.43 0)
+    (property "Reference" "#PWR04" (at 113.03 147.32 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "+3V3" (at 113.03 129.54 0)
+    (property "Value" "+3V3" (at 113.03 138.43 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 113.03 134.62 0)
+    (property "Footprint" "" (at 113.03 143.51 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 113.03 134.62 0)
+    (property "Datasheet" "" (at 113.03 143.51 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid da44097b-b075-4f77-8239-e9d85aa4939c))
@@ -1132,19 +1620,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 132.08 121.92 0) (unit 1)
+  (symbol (lib_id "Device:R") (at 120.65 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 3c8d0303-adea-4c20-a6c2-414e0673215c)
-    (property "Reference" "R6" (at 130.81 116.84 0)
+    (property "Reference" "R6" (at 119.38 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 132.08 123.19 90)
+    (property "Value" "R" (at 120.65 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 130.302 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 118.872 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 132.08 121.92 0)
+    (property "Datasheet" "~" (at 120.65 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid d2546e97-6f1e-4e73-889c-1e7e21617a49))
@@ -1158,32 +1646,6 @@
     )
   )
 
-  (symbol (lib_id "Device:D_Schottky") (at 241.3 63.5 270) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no)
-    (uuid 40b64020-2908-47a7-848e-9cceb4f571b0)
-    (property "Reference" "D3" (at 242.57 63.5 90)
-      (effects (font (size 1.27 1.27)) (justify left))
-    )
-    (property "Value" "D_Schottky" (at 242.57 66.04 90)
-      (effects (font (size 1.27 1.27)) (justify left))
-    )
-    (property "Footprint" "" (at 241.3 63.5 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (property "Datasheet" "~" (at 241.3 63.5 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (pin "2" (uuid c906f671-806a-42b4-989d-b6cabf58aa19))
-    (pin "1" (uuid 161c9038-81a8-4291-b957-b89261304ecf))
-    (instances
-      (project "parallax"
-        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
-          (reference "D3") (unit 1)
-        )
-      )
-    )
-  )
-
   (symbol (lib_id "power:GND") (at 36.83 100.33 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 42d68a4a-075e-4da7-8b08-fa4d04f02217)
@@ -1209,19 +1671,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 158.75 125.73 90) (unit 1)
+  (symbol (lib_id "Device:R") (at 158.75 134.62 90) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 469c565f-e0d6-46c1-be77-54bfc706524b)
-    (property "Reference" "R12" (at 158.75 123.19 90)
+    (property "Reference" "R12" (at 158.75 132.08 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Value" "1K" (at 158.75 125.73 90)
+    (property "Value" "1K" (at 158.75 134.62 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 158.75 127.508 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 158.75 136.398 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 158.75 125.73 0)
+    (property "Datasheet" "~" (at 158.75 134.62 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 7a0d5423-c6fc-4e58-845c-30f74536a750))
@@ -1261,19 +1723,19 @@
     )
   )
 
-  (symbol (lib_id "power:+3V3") (at 241.3 59.69 0) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+  (symbol (lib_id "power:+3V3") (at 247.65 62.23 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no)
     (uuid 4e421a25-3f4c-43b1-a0be-7a6eb7f0ffb5)
-    (property "Reference" "#PWR013" (at 241.3 63.5 0)
+    (property "Reference" "#PWR013" (at 247.65 66.04 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "+3V3" (at 241.3 54.61 0)
+    (property "Value" "+3V3" (at 251.46 59.69 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 241.3 59.69 0)
+    (property "Footprint" "" (at 247.65 62.23 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 241.3 59.69 0)
+    (property "Datasheet" "" (at 247.65 62.23 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid c03ea9bf-8c83-42d2-9dcd-705aa2fef5d0))
@@ -1286,19 +1748,44 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 53.34 85.09 0) (unit 1)
+  (symbol (lib_id "Connector:TestPoint") (at 171.45 134.62 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 5019d0e8-7eb3-4da4-a9a8-3c586e5b9b38)
+    (property "Reference" "TP8" (at 173.99 130.048 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Value" "TestPoint" (at 173.99 132.588 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 176.53 134.62 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 176.53 134.62 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid 906808eb-9b59-4e08-a6da-82425b48b1d7))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "TP8") (unit 1)
+        )
+      )
+    )
+  )
+
+  (symbol (lib_id "Device:R") (at 53.34 77.47 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 56f958ee-3ff4-4df3-b822-9ed1b5a29eea)
-    (property "Reference" "R1" (at 55.88 83.82 0)
+    (property "Reference" "R1" (at 55.88 76.2 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 55.88 86.36 0)
+    (property "Value" "R" (at 55.88 78.74 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 51.562 85.09 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 51.562 77.47 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 53.34 85.09 0)
+    (property "Datasheet" "~" (at 53.34 77.47 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "2" (uuid 0af8bbea-c3f6-4902-9bd3-96d98e1637aa))
@@ -1312,19 +1799,44 @@
     )
   )
 
-  (symbol (lib_id "4xxx:4052") (at 142.24 140.97 90) (mirror x) (unit 1)
+  (symbol (lib_id "Connector:TestPoint") (at 182.88 67.31 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 58787147-2d1c-41c4-86b5-2374cd5a9426)
+    (property "Reference" "TP4" (at 185.42 62.738 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Value" "TestPoint" (at 185.42 65.278 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 187.96 67.31 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 187.96 67.31 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid 5056af80-f75d-48de-88b2-650a6af022d1))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "TP4") (unit 1)
+        )
+      )
+    )
+  )
+
+  (symbol (lib_id "4xxx:4052") (at 142.24 149.86 90) (mirror x) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 5a5391fd-873e-499b-b8c0-4c77014eb541)
-    (property "Reference" "U3" (at 123.19 142.24 90)
+    (property "Reference" "U3" (at 123.19 151.13 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Value" "4052" (at 120.65 140.6459 90)
+    (property "Value" "4052" (at 120.65 149.5359 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "Package_SO:SSOP-16_5.3x6.2mm_P0.65mm" (at 142.24 140.97 0)
+    (property "Footprint" "Package_SO:SSOP-16_5.3x6.2mm_P0.65mm" (at 142.24 149.86 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "http://www.intersil.com/content/dam/Intersil/documents/cd40/cd4051bms-52bms-53bms.pdf" (at 142.24 140.97 0)
+    (property "Datasheet" "http://www.intersil.com/content/dam/Intersil/documents/cd40/cd4051bms-52bms-53bms.pdf" (at 142.24 149.86 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "16" (uuid 404971d1-4069-49d9-8e20-10f64eaf1556))
@@ -1352,19 +1864,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 139.7 121.92 0) (unit 1)
+  (symbol (lib_id "Device:R") (at 151.13 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 61dbb224-a3f8-46ab-ab34-bae84db11cc7)
-    (property "Reference" "R9" (at 138.43 116.84 0)
+    (property "Reference" "R9" (at 149.86 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 139.7 123.19 90)
+    (property "Value" "R" (at 151.13 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 137.922 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 149.352 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 139.7 121.92 0)
+    (property "Datasheet" "~" (at 151.13 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid a5ae255f-6946-42a8-add4-746179dd22bb))
@@ -1378,6 +1890,31 @@
     )
   )
 
+  (symbol (lib_id "Connector:TestPoint") (at 49.53 85.09 90) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no)
+    (uuid 629e6e79-158b-42fa-94fb-f72f1ceacaab)
+    (property "Reference" "TP3" (at 44.958 82.55 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Value" "TestPoint" (at 47.498 82.55 0)
+      (effects (font (size 1.27 1.27)) (justify left))
+    )
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 49.53 80.01 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 49.53 80.01 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid 2acaea12-d136-413c-9690-dd0a876c9b9c))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "TP3") (unit 1)
+        )
+      )
+    )
+  )
+
   (symbol (lib_id "Amplifier_Operational:MCP6002-xMC") (at 167.64 67.31 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 6991f3d2-39ad-4cff-b208-1e44baca6bf6)
@@ -1393,6 +1930,9 @@
     (property "Datasheet" "http://ww1.microchip.com/downloads/en/DeviceDoc/21733j.pdf" (at 167.64 67.31 0)
       (effects (font (size 1.27 1.27)) hide)
     )
+    (property "Reichelt Part-Number" "MCP 6002-I/SN" (at 167.64 67.31 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
     (pin "9" (uuid 4d6b2679-3947-48ff-8e08-dd1c1848439f))
     (pin "7" (uuid 6b171588-eeda-4f17-ab02-f0fed5b91c9d))
     (pin "2" (uuid d17a7b91-2e9d-43e6-bbb4-19448684b78e))
@@ -1411,19 +1951,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 137.16 121.92 0) (unit 1)
+  (symbol (lib_id "Device:R") (at 148.59 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 6bc9db80-64e9-47f4-b888-3fb6f98db37e)
-    (property "Reference" "R8" (at 135.89 116.84 0)
+    (property "Reference" "R8" (at 147.32 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 137.16 123.19 90)
+    (property "Value" "R" (at 148.59 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 135.382 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 146.812 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 137.16 121.92 0)
+    (property "Datasheet" "~" (at 148.59 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 3227b796-de4a-4bdd-9a19-e4660e2721c5))
@@ -1437,19 +1977,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 142.24 121.92 0) (unit 1)
+  (symbol (lib_id "Device:R") (at 153.67 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 71060635-956f-4cc8-bf5d-4b4d5874e050)
-    (property "Reference" "R10" (at 140.97 116.84 0)
+    (property "Reference" "R10" (at 152.4 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 142.24 123.19 90)
+    (property "Value" "R" (at 153.67 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 140.462 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 151.892 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 142.24 121.92 0)
+    (property "Datasheet" "~" (at 153.67 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 1876d234-6864-4efe-9f81-40dc24540b57))
@@ -1463,19 +2003,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 204.47 120.65 90) (unit 1)
+  (symbol (lib_id "Device:R") (at 149.86 133.35 180) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid 85b91f6d-33fb-49e8-bbfd-f7ba762144b1)
-    (property "Reference" "R16" (at 204.47 118.11 90)
+    (property "Reference" "R16" (at 147.32 133.35 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Value" "10K" (at 204.47 120.65 90)
+    (property "Value" "10K" (at 149.86 133.35 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 204.47 122.428 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 151.638 133.35 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 204.47 120.65 0)
+    (property "Datasheet" "~" (at 149.86 133.35 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid a2beaf91-586e-4213-a6c7-869c2f43dda6))
@@ -1541,6 +2081,31 @@
     )
   )
 
+  (symbol (lib_id "power:+3V3") (at 148.59 59.69 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no)
+    (uuid 8bc1cb37-91d3-42b0-8684-84f5bb77c29c)
+    (property "Reference" "#PWR07" (at 148.59 63.5 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Value" "+3V3" (at 152.4 57.15 0)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Footprint" "" (at 148.59 59.69 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "" (at 148.59 59.69 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid c1c35cb6-1036-4e7b-b947-72766cb3dba0))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "#PWR07") (unit 1)
+        )
+      )
+    )
+  )
+
   (symbol (lib_id "Device:R") (at 182.88 74.93 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 909585f2-72eb-49d4-94c5-e980f9dad613)
@@ -1567,6 +2132,31 @@
     )
   )
 
+  (symbol (lib_id "Connector:TestPoint") (at 171.45 137.16 180) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 90b2cfe4-273f-416f-b17e-62fedf0ccd42)
+    (property "Reference" "TP7" (at 173.99 139.192 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+    )
+    (property "Value" "TestPoint" (at 173.99 141.732 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+    )
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 166.37 137.16 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "~" (at 166.37 137.16 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid 600b6a3e-5418-43ed-8b94-6a2571feff28))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "TP7") (unit 1)
+        )
+      )
+    )
+  )
+
   (symbol (lib_id "power:+3V3") (at 251.46 129.54 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 99daf875-87d2-4295-a048-048da0f54a82)
@@ -1618,19 +2208,19 @@
     )
   )
 
-  (symbol (lib_id "Device:C") (at 113.03 144.78 0) (mirror y) (unit 1)
+  (symbol (lib_id "Device:C") (at 113.03 153.67 0) (mirror y) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid a0a15276-5e48-4ccd-83c9-3cd712cb67bb)
-    (property "Reference" "C6" (at 109.22 143.51 0)
+    (property "Reference" "C6" (at 109.22 152.4 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "100nF" (at 109.22 146.05 0)
+    (property "Value" "100nF" (at 109.22 154.94 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder" (at 112.0648 148.59 0)
+    (property "Footprint" "Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder" (at 112.0648 157.48 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 113.03 144.78 0)
+    (property "Datasheet" "~" (at 113.03 153.67 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "2" (uuid b2226ff0-1938-432b-b0ba-567b25d46bc5))
@@ -1644,19 +2234,19 @@
     )
   )
 
-  (symbol (lib_id "power:GND") (at 137.16 153.67 0) (unit 1)
+  (symbol (lib_id "power:GND") (at 137.16 162.56 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid a10c528a-f7ee-4b6b-97f3-dab497468a9e)
-    (property "Reference" "#PWR08" (at 137.16 160.02 0)
+    (property "Reference" "#PWR08" (at 137.16 168.91 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "GND" (at 137.16 158.75 0)
+    (property "Value" "GND" (at 137.16 167.64 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 137.16 153.67 0)
+    (property "Footprint" "" (at 137.16 162.56 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 137.16 153.67 0)
+    (property "Datasheet" "" (at 137.16 162.56 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid e6b19060-b96b-4a2f-ae21-24b835f07681))
@@ -1669,52 +2259,51 @@
     )
   )
 
-  (symbol (lib_id "power:GND") (at 251.46 144.78 0) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
-    (uuid b2dbf128-2ff1-46f7-8d5a-28f43cb73004)
-    (property "Reference" "#PWR011" (at 251.46 151.13 0)
-      (effects (font (size 1.27 1.27)) hide)
+  (symbol (lib_id "Connector:TestPoint") (at 156.21 69.85 0) (mirror y) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no)
+    (uuid ab51803b-8d6f-4163-b52c-5b8b385e8bba)
+    (property "Reference" "TP6" (at 153.67 67.31 0)
+      (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "GND" (at 251.46 149.86 0)
-      (effects (font (size 1.27 1.27)))
+    (property "Value" "TestPoint" (at 153.67 69.85 0)
+      (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "" (at 251.46 144.78 0)
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 151.13 69.85 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 251.46 144.78 0)
+    (property "Datasheet" "~" (at 151.13 69.85 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (pin "1" (uuid 1e6e9710-70b9-4043-86ac-2208602bd6e7))
+    (pin "1" (uuid 9a9eb9b2-d237-4ca9-80dd-a4d421cffef2))
     (instances
       (project "parallax"
         (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
-          (reference "#PWR011") (unit 1)
+          (reference "TP6") (unit 1)
         )
       )
     )
   )
 
-  (symbol (lib_id "Device:D_Schottky") (at 130.81 60.96 270) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no)
-    (uuid b6de3780-3d7f-4c35-a528-d1526ac16786)
-    (property "Reference" "D1" (at 132.08 60.96 90)
-      (effects (font (size 1.27 1.27)) (justify left))
+  (symbol (lib_id "power:GND") (at 251.46 144.78 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid b2dbf128-2ff1-46f7-8d5a-28f43cb73004)
+    (property "Reference" "#PWR011" (at 251.46 151.13 0)
+      (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "D_Schottky" (at 132.08 63.5 90)
-      (effects (font (size 1.27 1.27)) (justify left))
+    (property "Value" "GND" (at 251.46 149.86 0)
+      (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 130.81 60.96 0)
+    (property "Footprint" "" (at 251.46 144.78 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 130.81 60.96 0)
+    (property "Datasheet" "" (at 251.46 144.78 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (pin "2" (uuid c86735fe-0b65-475e-a5d2-861595efe71a))
-    (pin "1" (uuid 6758a209-c020-4f33-b01a-3c6dc8a67074))
+    (pin "1" (uuid 1e6e9710-70b9-4043-86ac-2208602bd6e7))
     (instances
       (project "parallax"
         (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
-          (reference "D1") (unit 1)
+          (reference "#PWR011") (unit 1)
         )
       )
     )
@@ -1746,19 +2335,19 @@
     )
   )
 
-  (symbol (lib_id "power:GND") (at 208.28 123.19 0) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+  (symbol (lib_id "power:GND") (at 153.67 129.54 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no)
     (uuid c382b029-0bc1-4b45-b356-96a00076365a)
-    (property "Reference" "#PWR012" (at 208.28 129.54 0)
+    (property "Reference" "#PWR012" (at 153.67 135.89 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "GND" (at 208.28 128.27 0)
-      (effects (font (size 1.27 1.27)))
+    (property "Value" "GND" (at 153.67 129.54 0)
+      (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "" (at 208.28 123.19 0)
+    (property "Footprint" "" (at 153.67 129.54 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 208.28 123.19 0)
+    (property "Datasheet" "" (at 153.67 129.54 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 4149892c-e676-45ae-bcc8-8721bcb77bf6))
@@ -1771,19 +2360,19 @@
     )
   )
 
-  (symbol (lib_id "power:GND") (at 113.03 148.59 0) (unit 1)
+  (symbol (lib_id "power:GND") (at 113.03 157.48 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid ca48ab43-2263-4f51-a44d-947b0e8ca7cb)
-    (property "Reference" "#PWR022" (at 113.03 154.94 0)
+    (property "Reference" "#PWR022" (at 113.03 163.83 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "GND" (at 113.03 153.67 0)
+    (property "Value" "GND" (at 113.03 162.56 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 113.03 148.59 0)
+    (property "Footprint" "" (at 113.03 157.48 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 113.03 148.59 0)
+    (property "Datasheet" "" (at 113.03 157.48 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 818ed1d8-2f31-4daf-a672-bdefd7025b62))
@@ -1822,19 +2411,49 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 144.78 121.92 0) (unit 1)
+  (symbol (lib_id "Diode:BAS40-04") (at 240.03 64.77 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid d6fd84e2-6ccb-4031-a1c9-6c9f20950480)
+    (property "Reference" "D5" (at 240.03 55.88 0)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Value" "BAS40-04" (at 240.03 58.42 0)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Footprint" "Package_TO_SOT_SMD:SOT-23" (at 233.68 57.15 0)
+      (effects (font (size 1.27 1.27)) (justify left) hide)
+    )
+    (property "Datasheet" "http://www.vishay.com/docs/85701/bas40v.pdf" (at 236.982 62.23 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Reichelt Part-Number" "BAS 40-04 SMD" (at 240.03 64.77 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "3" (uuid 32dcb90d-d19e-44b0-99b6-ff537dcb114e))
+    (pin "1" (uuid b5279f86-16eb-48b7-8386-377b1787fa6b))
+    (pin "2" (uuid 2d682d7a-a47b-4d2d-9395-b97fb499f0ca))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
+          (reference "D5") (unit 1)
+        )
+      )
+    )
+  )
+
+  (symbol (lib_id "Device:R") (at 156.21 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid d7ad053e-e0e6-4546-b64f-5f649bf461ee)
-    (property "Reference" "R11" (at 143.51 116.84 0)
+    (property "Reference" "R11" (at 154.94 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 144.78 123.19 90)
+    (property "Value" "R" (at 156.21 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 143.002 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 154.432 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 144.78 121.92 0)
+    (property "Datasheet" "~" (at 156.21 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 7de7dd76-0250-4d89-bce4-04589e2a2f83))
@@ -1848,26 +2467,31 @@
     )
   )
 
-  (symbol (lib_id "power:GND") (at 130.81 72.39 0) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no)
-    (uuid dc10214e-d792-48be-8dbf-3357bb32ac03)
-    (property "Reference" "#PWR07" (at 130.81 78.74 0)
-      (effects (font (size 1.27 1.27)) hide)
+  (symbol (lib_id "Diode:BAS40-04") (at 140.97 62.23 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid db94a0f4-12f4-4241-9e01-9b2987cbc921)
+    (property "Reference" "D1" (at 140.97 53.34 0)
+      (effects (font (size 1.27 1.27)))
     )
-    (property "Value" "GND" (at 130.81 77.47 0)
+    (property "Value" "BAS40-04" (at 140.97 55.88 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 130.81 72.39 0)
+    (property "Footprint" "Package_TO_SOT_SMD:SOT-23" (at 134.62 54.61 0)
+      (effects (font (size 1.27 1.27)) (justify left) hide)
+    )
+    (property "Datasheet" "http://www.vishay.com/docs/85701/bas40v.pdf" (at 137.922 59.69 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 130.81 72.39 0)
+    (property "Reichelt Part-Number" "BAS 40-04 SMD" (at 140.97 62.23 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (pin "1" (uuid 1031a844-dafe-4692-9cc1-439d205bc1a9))
+    (pin "3" (uuid 3c87e0f8-c029-4f9f-9acd-9a41f5d1d1ef))
+    (pin "1" (uuid e49ad494-19bd-4319-8379-8e6d52779f06))
+    (pin "2" (uuid e5b98871-333a-4ad2-8dcb-649cf5e84d52))
     (instances
       (project "parallax"
         (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
-          (reference "#PWR07") (unit 1)
+          (reference "D1") (unit 1)
         )
       )
     )
@@ -1899,19 +2523,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 163.83 128.27 90) (mirror x) (unit 1)
+  (symbol (lib_id "Device:R") (at 163.83 137.16 90) (mirror x) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid e357739b-332c-4bf4-9f46-176df23acc3c)
-    (property "Reference" "R13" (at 163.83 130.81 90)
+    (property "Reference" "R13" (at 163.83 139.7 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Value" "1K" (at 163.83 128.27 90)
+    (property "Value" "1K" (at 163.83 137.16 90)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 163.83 126.492 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 163.83 135.382 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 163.83 128.27 0)
+    (property "Datasheet" "~" (at 163.83 137.16 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid cf2dc705-c7ca-4339-9eaf-ab64b8fcd081))
@@ -1925,27 +2549,26 @@
     )
   )
 
-  (symbol (lib_id "Device:D_Schottky") (at 130.81 68.58 270) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no)
-    (uuid e460e288-6acd-4c3f-86a7-48a40991af51)
-    (property "Reference" "D2" (at 132.08 68.58 90)
+  (symbol (lib_id "Connector:TestPoint") (at 113.03 64.77 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid e4e50623-febc-4d2a-88fb-5aa683eccb2c)
+    (property "Reference" "TP1" (at 115.57 60.198 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "D_Schottky" (at 132.08 71.12 90)
+    (property "Value" "TestPoint" (at 115.57 62.738 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "" (at 130.81 68.58 0)
+    (property "Footprint" "TestPoint:TestPoint_Pad_D1.5mm" (at 118.11 64.77 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 130.81 68.58 0)
+    (property "Datasheet" "~" (at 118.11 64.77 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (pin "2" (uuid 20e2d763-d6e7-4ae5-8928-19e98ff02b3d))
-    (pin "1" (uuid 20ddd895-60bc-485b-bbd1-4abcb7d1ec21))
+    (pin "1" (uuid 612eb5b8-9471-4dd5-ab0c-d6192e0d16dd))
     (instances
       (project "parallax"
         (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
-          (reference "D2") (unit 1)
+          (reference "TP1") (unit 1)
         )
       )
     )
@@ -2028,19 +2651,19 @@
     )
   )
 
-  (symbol (lib_id "Device:R") (at 127 121.92 0) (unit 1)
+  (symbol (lib_id "Device:R") (at 115.57 115.57 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no)
     (uuid e921b640-1664-4bf4-be64-44fa10450f92)
-    (property "Reference" "R4" (at 125.73 116.84 0)
+    (property "Reference" "R4" (at 114.3 110.49 0)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Value" "R" (at 127 123.19 90)
+    (property "Value" "R" (at 115.57 116.84 90)
       (effects (font (size 1.27 1.27)) (justify left))
     )
-    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 125.222 121.92 90)
+    (property "Footprint" "Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder" (at 113.792 115.57 90)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "~" (at 127 121.92 0)
+    (property "Datasheet" "~" (at 115.57 115.57 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 49e9d7f0-be6e-486c-a56a-dd31a5f0cc40))
@@ -2054,19 +2677,19 @@
     )
   )
 
-  (symbol (lib_id "power:GND") (at 127 153.67 0) (unit 1)
+  (symbol (lib_id "power:GND") (at 127 162.56 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid e9977788-9f3b-41bc-adec-83e1f7c6e167)
-    (property "Reference" "#PWR05" (at 127 160.02 0)
+    (property "Reference" "#PWR05" (at 127 168.91 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "GND" (at 127 158.75 0)
+    (property "Value" "GND" (at 127 167.64 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 127 153.67 0)
+    (property "Footprint" "" (at 127 162.56 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 127 153.67 0)
+    (property "Datasheet" "" (at 127 162.56 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 00164df0-7d66-4f96-9d34-f40c74c9ac22))
@@ -2094,6 +2717,9 @@
     (property "Datasheet" "http://ww1.microchip.com/downloads/en/DeviceDoc/21733j.pdf" (at 254 137.16 0)
       (effects (font (size 1.27 1.27)) hide)
     )
+    (property "Reichelt Part-Number" "MCP 6002-I/SN" (at 254 137.16 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
     (pin "8" (uuid 1189677e-e882-4421-8c2f-80d07cab4089))
     (pin "1" (uuid 423738ca-fd2d-4843-8293-d46188aa95d7))
     (pin "3" (uuid 345feb65-2028-4ef9-a24d-cf017d1e379d))
@@ -2112,19 +2738,19 @@
     )
   )
 
-  (symbol (lib_id "power:GND") (at 165.1 143.51 0) (unit 1)
+  (symbol (lib_id "power:GND") (at 165.1 152.4 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid f83d02d3-ce23-4a02-b31a-509513f55840)
-    (property "Reference" "#PWR09" (at 165.1 149.86 0)
+    (property "Reference" "#PWR09" (at 165.1 158.75 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Value" "GND" (at 165.1 148.59 0)
+    (property "Value" "GND" (at 165.1 157.48 0)
       (effects (font (size 1.27 1.27)))
     )
-    (property "Footprint" "" (at 165.1 143.51 0)
+    (property "Footprint" "" (at 165.1 152.4 0)
       (effects (font (size 1.27 1.27)) hide)
     )
-    (property "Datasheet" "" (at 165.1 143.51 0)
+    (property "Datasheet" "" (at 165.1 152.4 0)
       (effects (font (size 1.27 1.27)) hide)
     )
     (pin "1" (uuid 74b733ef-fa8c-4aff-aa5f-2fd1e025e40e))
@@ -2136,55 +2762,4 @@
       )
     )
   )
-
-  (symbol (lib_id "Device:D_Schottky") (at 241.3 71.12 270) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no)
-    (uuid f86fad7a-243c-48b7-ab59-4fdd81adcfe8)
-    (property "Reference" "D4" (at 242.57 71.12 90)
-      (effects (font (size 1.27 1.27)) (justify left))
-    )
-    (property "Value" "D_Schottky" (at 242.57 73.66 90)
-      (effects (font (size 1.27 1.27)) (justify left))
-    )
-    (property "Footprint" "" (at 241.3 71.12 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (property "Datasheet" "~" (at 241.3 71.12 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (pin "2" (uuid 89bc153d-aaba-44bf-8556-4cb64a39700e))
-    (pin "1" (uuid cec147f9-8861-40e0-a8dd-715c90891a51))
-    (instances
-      (project "parallax"
-        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
-          (reference "D4") (unit 1)
-        )
-      )
-    )
-  )
-
-  (symbol (lib_id "power:+3V3") (at 130.81 57.15 0) (unit 1)
-    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
-    (uuid fa794631-5084-4f76-acfa-c714ac210457)
-    (property "Reference" "#PWR06" (at 130.81 60.96 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (property "Value" "+3V3" (at 130.81 52.07 0)
-      (effects (font (size 1.27 1.27)))
-    )
-    (property "Footprint" "" (at 130.81 57.15 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (property "Datasheet" "" (at 130.81 57.15 0)
-      (effects (font (size 1.27 1.27)) hide)
-    )
-    (pin "1" (uuid 114e7425-e751-4119-968b-9da6736e8aa4))
-    (instances
-      (project "parallax"
-        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c/89a1e200-d02e-41b4-8035-131adfe663f2"
-          (reference "#PWR06") (unit 1)
-        )
-      )
-    )
-  )
 )
diff --git a/hardware/parallax.kicad_sch b/hardware/parallax.kicad_sch
index 9bbc8fa..ace3b9b 100644
--- a/hardware/parallax.kicad_sch
+++ b/hardware/parallax.kicad_sch
@@ -267,6 +267,58 @@
         )
       )
     )
+    (symbol "power:+3V3" (power) (pin_names (offset 0)) (in_bom yes) (on_board yes)
+      (property "Reference" "#PWR" (at 0 -3.81 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "Value" "+3V3" (at 0 3.556 0)
+        (effects (font (size 1.27 1.27)))
+      )
+      (property "Footprint" "" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "Datasheet" "" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_keywords" "global power" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (property "ki_description" "Power symbol creates a global label with name \"+3V3\"" (at 0 0 0)
+        (effects (font (size 1.27 1.27)) hide)
+      )
+      (symbol "+3V3_0_1"
+        (polyline
+          (pts
+            (xy -0.762 1.27)
+            (xy 0 2.54)
+          )
+          (stroke (width 0) (type default))
+          (fill (type none))
+        )
+        (polyline
+          (pts
+            (xy 0 0)
+            (xy 0 2.54)
+          )
+          (stroke (width 0) (type default))
+          (fill (type none))
+        )
+        (polyline
+          (pts
+            (xy 0 2.54)
+            (xy 0.762 1.27)
+          )
+          (stroke (width 0) (type default))
+          (fill (type none))
+        )
+      )
+      (symbol "+3V3_1_1"
+        (pin power_in line (at 0 0 90) (length 0) hide
+          (name "+3V3" (effects (font (size 1.27 1.27))))
+          (number "1" (effects (font (size 1.27 1.27))))
+        )
+      )
+    )
     (symbol "power:GND" (power) (pin_names (offset 0)) (in_bom yes) (on_board yes)
       (property "Reference" "#PWR" (at 0 -6.35 0)
         (effects (font (size 1.27 1.27)) hide)
@@ -338,6 +390,10 @@
     (stroke (width 0) (type default))
     (uuid 5fc4cc1e-ec8f-416e-b3fb-5edbac8846e3)
   )
+  (wire (pts (xy 222.25 77.47) (xy 232.41 77.47))
+    (stroke (width 0) (type default))
+    (uuid 751d2217-d5e7-4791-81fb-b146381f6b40)
+  )
   (wire (pts (xy 222.25 97.79) (xy 228.6 97.79))
     (stroke (width 0) (type default))
     (uuid 781c81cc-3385-400a-a59d-856144a20093)
@@ -363,6 +419,15 @@
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 0922be99-6b0e-4569-94a4-76aae6ba0a4b)
   )
+  (text "todo: add some status LEDs?" (at 102.87 128.27 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid 7e90c037-b40a-4cae-855a-87b288dc7938)
+  )
+  (text "todo: maybe add a signal genertor?\n(R2R Ladder DAC 12 Bit?)"
+    (at 100.33 139.7 0)
+    (effects (font (size 1.27 1.27)) (justify left bottom))
+    (uuid ffb2bd55-fd8c-4459-815d-c6b001f64175)
+  )
 
   (symbol (lib_id "power:GND") (at 228.6 72.39 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
@@ -532,6 +597,31 @@
     )
   )
 
+  (symbol (lib_id "power:+3V3") (at 232.41 77.47 0) (unit 1)
+    (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
+    (uuid 517188fa-072f-4489-b2d7-5378e979a3ff)
+    (property "Reference" "#PWR025" (at 232.41 81.28 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Value" "+3V3" (at 232.41 72.39 0)
+      (effects (font (size 1.27 1.27)))
+    )
+    (property "Footprint" "" (at 232.41 77.47 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (property "Datasheet" "" (at 232.41 77.47 0)
+      (effects (font (size 1.27 1.27)) hide)
+    )
+    (pin "1" (uuid f2c97a64-e5ff-4295-8c43-c7aa8a1f50e7))
+    (instances
+      (project "parallax"
+        (path "/9be75e04-ffa7-400b-a6f6-98cbc4c2c88c"
+          (reference "#PWR025") (unit 1)
+        )
+      )
+    )
+  )
+
   (symbol (lib_id "power:GND") (at 228.6 97.79 0) (unit 1)
     (in_bom yes) (on_board yes) (dnp no) (fields_autoplaced)
     (uuid 7efd6b29-20c5-4515-9b6c-77a13d3ee4ba)