Arduino Kitchen Scale with binary display

Parts

1. 1x HX711 Load cell amplifier
2. 1x Straight bar load cell (2kg)
3. 1x Charlieplexed led array with 12 leds (See schematics)

Requirements

1. HX711_ADC library
2. CHPLX12 library

Calibrate

1. Upload calibration firmware

Define CALIBRATE_MODE in firmware.ino, complile and upload the firmware.

2. Put a known weightd item to the scale and use the serial interface for calibration

Connect to the serial port and use the following keys to adjust the measured weight:

Key	Calibration Value
h	+1
H	+10
l	-1
L	-10
t	Tare

3. Update the calibration factor

Update the DEFAULT_CAL_FACTOR in the firmware.ino with the new CalFactor value.

Display

Generate gerber files for production

1. Plot the PCB

   • Layers:
     • F.Cu
     • B.Cu
     • B.SilkS
     • F.SilkS
     • B.Mask
     • F.Mask
     • Edge.Cuts
   • Options:
     • Use Protel filename extensions
     • Include extended attributes
     • Subtract soldermask from silkscreen

2. Generate drill file with the following options:

   • Millimeters as drill units
   • Supress leading zeros as zeros format
   • PostScript as drill map format

3. Rename all files with the schematics/scripts/rename_gerber_files.sh script