diff --git a/libraries/I2C_LCD/.arduino-ci.yml b/libraries/I2C_LCD/.arduino-ci.yml
new file mode 100644
index 000000000..77a333f93
--- /dev/null
+++ b/libraries/I2C_LCD/.arduino-ci.yml
@@ -0,0 +1,28 @@
+platforms:
+  rpipico:
+    board: rp2040:rp2040:rpipico
+    package: rp2040:rp2040
+    gcc:
+      features:
+      defines:
+        - ARDUINO_ARCH_RP2040
+      warnings:
+      flags:
+
+packages:
+  rp2040:rp2040:
+    url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+
+compile:
+  # Choosing to run compilation tests on 2 different Arduino platforms
+  platforms:
+    - uno
+    # - due
+    # - zero
+    # - leonardo
+    - m4
+    - esp32
+    - esp8266
+    # - mega2560
+    - rpipico
+
diff --git a/libraries/I2C_LCD/.github/FUNDING.yml b/libraries/I2C_LCD/.github/FUNDING.yml
new file mode 100644
index 000000000..90d9ab4c4
--- /dev/null
+++ b/libraries/I2C_LCD/.github/FUNDING.yml
@@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: RobTillaart
+
diff --git a/libraries/I2C_LCD/.github/workflows/arduino-lint.yml b/libraries/I2C_LCD/.github/workflows/arduino-lint.yml
new file mode 100644
index 000000000..8a26f14a5
--- /dev/null
+++ b/libraries/I2C_LCD/.github/workflows/arduino-lint.yml
@@ -0,0 +1,13 @@
+
+name: Arduino-lint
+
+on: [push, pull_request]
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: arduino/arduino-lint-action@v1
+        with:
+          library-manager: update
+          compliance: strict
diff --git a/libraries/I2C_LCD/.github/workflows/arduino_test_runner.yml b/libraries/I2C_LCD/.github/workflows/arduino_test_runner.yml
new file mode 100644
index 000000000..fadfa9043
--- /dev/null
+++ b/libraries/I2C_LCD/.github/workflows/arduino_test_runner.yml
@@ -0,0 +1,17 @@
+---
+name: Arduino CI
+
+on: [push, pull_request]
+
+jobs:
+  runTest:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+      - run: |
+          gem install arduino_ci
+          arduino_ci.rb
diff --git a/libraries/I2C_LCD/.github/workflows/jsoncheck.yml b/libraries/I2C_LCD/.github/workflows/jsoncheck.yml
new file mode 100644
index 000000000..37a11298c
--- /dev/null
+++ b/libraries/I2C_LCD/.github/workflows/jsoncheck.yml
@@ -0,0 +1,18 @@
+name: JSON check
+
+on:
+  push:
+    paths:
+      - '**.json'
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: json-syntax-check
+        uses: limitusus/json-syntax-check@v1
+        with:
+          pattern: "\\.json$"
+
diff --git a/libraries/I2C_LCD/CHANGELOG.md b/libraries/I2C_LCD/CHANGELOG.md
new file mode 100644
index 000000000..f7b2d08ce
--- /dev/null
+++ b/libraries/I2C_LCD/CHANGELOG.md
@@ -0,0 +1,12 @@
+# Change Log I2C_LCD
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [0.1.0] - 2023-12-16
+- initial version 
+- goal is to optimize footprint & performance
+
diff --git a/libraries/I2C_LCD/I2C_LCD.cpp b/libraries/I2C_LCD/I2C_LCD.cpp
new file mode 100644
index 000000000..7190f94bc
--- /dev/null
+++ b/libraries/I2C_LCD/I2C_LCD.cpp
@@ -0,0 +1,251 @@
+//
+//    FILE: I2C_LCD.cpp
+//  AUTHOR: Rob.Tillaart@gmail.com
+// VERSION: 0.1.0
+//    DATE: 2023-12-16
+// PUPROSE: Arduino library for I2C_LCD
+//     URL: https://github.com/RobTillaart/I2C_LCD
+
+
+#include "I2C_LCD.h"
+
+
+//  TODO redo simplify names shorter 
+//       or keep them compatible?
+#define I2C_LCD_CLEARDISPLAY        0x01
+#define I2C_LCD_RETURNHOME          0x02
+#define I2C_LCD_ENTRYMODESET        0x04
+#define I2C_LCD_DISPLAYCONTROL      0x08
+#define I2C_LCD_CURSORSHIFT         0x10
+#define I2C_LCD_FUNCTIONSET         0x20
+#define I2C_LCD_SETCGRAMADDR        0x40
+#define I2C_LCD_SETDDRAMADDR        0x80
+
+#define I2C_LCD_ENTRYRIGHT          0x00
+#define I2C_LCD_ENTRYLEFT           0x02
+#define I2C_LCD_ENTRYSHIFTINCREMENT 0x01
+#define I2C_LCD_ENTRYSHIFTDECREMENT 0x00
+
+#define I2C_LCD_DISPLAYON           0x04
+#define I2C_LCD_DISPLAYOFF          0x00
+#define I2C_LCD_CURSORON            0x02
+#define I2C_LCD_CURSOROFF           0x00
+#define I2C_LCD_BLINKON             0x01
+#define I2C_LCD_BLINKOFF            0x00
+
+#define I2C_LCD_DISPLAYMOVE         0x08
+#define I2C_LCD_CURSORMOVE          0x00
+#define I2C_LCD_MOVERIGHT           0x04
+#define I2C_LCD_MOVELEFT            0x00
+
+#define I2C_LCD_8BITMODE            0x10
+#define I2C_LCD_4BITMODE            0x00
+#define I2C_LCD_2LINE               0x08
+#define I2C_LCD_1LINE               0x00
+#define I2C_LCD_5x10DOTS            0x04
+#define I2C_LCD_5x8DOTS             0x00
+
+
+I2C_LCD::I2C_LCD(uint8_t address, TwoWire * wire)
+{
+  _address = address;
+  _wire = wire;
+}
+
+
+void I2C_LCD::config (uint8_t address, uint8_t enable, uint8_t readwrite, uint8_t registerselect, 
+                      uint8_t data4, uint8_t data5, uint8_t data6, uint8_t data7, 
+                      uint8_t backlight)  
+{
+  if (_address != address) return;  //  compatible
+  _enable         = ( 1 << enable);
+  _readWrite      = ( 1 << readwrite);
+  _registerSelect = ( 1 << registerselect);
+  _dataPin[0]     = ( 1 << data4);
+  _dataPin[1]     = ( 1 << data5);
+  _dataPin[2]     = ( 1 << data6);
+  _dataPin[3]     = ( 1 << data7);
+  _backLight      = ( 1 << backlight);
+
+  _pinsInOrder = ((data4 < data5) && (data5 < data6) && (data6 < data7));
+}
+
+
+void I2C_LCD::begin(uint8_t cols, uint8_t rows)
+{
+  _cols = cols;
+  _rows = rows;
+
+  //  ALL LOW.
+  _wire->beginTransmission(_address);
+  _wire->write(0x00);
+  _wire->endTransmission();
+
+  //  wait for 50 ms
+  delay(50);
+
+  //  Force 4 bit mode  //  todo timing...
+  write4bits(0x03);
+  delay(5);
+  write4bits(0x03);
+  delay(1);
+  write4bits(0x03);
+  delay(1);
+  write4bits(0x02);
+  delay(1);
+
+  //  set "two" lines LCD - always a 20 x 4 for now.
+  sendCommand(I2C_LCD_FUNCTIONSET | I2C_LCD_2LINE);
+}
+
+
+void I2C_LCD::setBacklight(bool on)
+{
+  if (on) display();   //  todo fix for real.
+  else noDisplay();
+}
+
+
+void I2C_LCD::display()
+{
+  sendCommand(I2C_LCD_DISPLAYCONTROL | I2C_LCD_DISPLAYON );
+}
+
+
+void I2C_LCD::noDisplay()
+{
+  sendCommand(I2C_LCD_DISPLAYCONTROL | I2C_LCD_DISPLAYOFF);
+}
+
+
+void I2C_LCD::clear()
+{
+  sendCommand(I2C_LCD_CLEARDISPLAY);
+  delay(2);
+}
+
+
+void I2C_LCD::home()
+{
+  sendCommand(I2C_LCD_RETURNHOME);
+  delay(2);
+}
+
+
+void I2C_LCD::setCursor(uint8_t col, uint8_t row)
+{
+  uint8_t startpos[4] = { 0x00, 0x40, 0x14, 0x54 };
+  sendCommand(I2C_LCD_SETDDRAMADDR | (startpos[row] + col) );
+}
+  
+
+size_t I2C_LCD::write(uint8_t c)
+{
+  sendData(c);  //  add timestamp..
+  return 1;
+};
+
+
+//////////////////////////////////////////////////////////
+//
+//  PRIVATE
+//
+
+//  TODO merge these two
+//  optimize 95% identical.
+void I2C_LCD::sendCommand(uint8_t value)
+{
+  uint8_t MSN = _backLight;
+  uint8_t LSN = MSN;
+
+  //  pins are in the right order.
+  //  TODO determine a flag and 
+  if (_pinsInOrder)
+  {
+    MSN |= value & 0xF0;
+    LSN |= value << 4;
+  }
+  else
+  {
+    uint8_t tmp = value >> 4;
+    for ( uint8_t i = 0; i < 4; i++ )
+    {
+      if ( tmp & 0x01 ) MSN |= _dataPin[i];
+      tmp >>= 1;
+    }
+    tmp = value & 0x0F;
+    for ( uint8_t i = 0; i < 4; i++ )
+    {
+      if ( tmp & 0x01 ) LSN |= _dataPin[i];
+      tmp >>= 1;
+    }
+  }
+
+  _wire->beginTransmission(_address);
+  _wire->write(MSN | _enable);
+  _wire->write(MSN);
+  _wire->write(LSN | _enable);
+  _wire->write(LSN);
+  _wire->endTransmission();
+}
+
+
+void I2C_LCD::sendData(uint8_t value)
+{
+  uint8_t MSN = _registerSelect | _backLight;
+  uint8_t LSN = MSN;
+
+  //  if pins are in the right order speed up.
+  //  todo determine a flag in config.
+  if (_pinsInOrder)
+  {
+    MSN |= value & 0xF0;
+    LSN |= value << 4;
+  }
+  else
+  {
+    uint8_t tmp = value >> 4;
+    for ( uint8_t i = 0; i < 4; i++ )
+    {
+      if ( tmp & 0x01 ) MSN |= _dataPin[i];
+      tmp >>= 1;
+    }
+    tmp = value & 0x0F;
+    for ( uint8_t i = 0; i < 4; i++ )
+    {
+      if ( tmp & 0x01 ) LSN |= _dataPin[i];
+      tmp >>= 1;
+    }
+  }
+
+  _wire->beginTransmission(_address);
+  _wire->write(MSN | _enable);
+  _wire->write(MSN);
+  _wire->write(LSN | _enable);
+  _wire->write(LSN);
+  _wire->endTransmission();
+}
+
+
+//  really needed for setup
+void I2C_LCD::write4bits(uint8_t value) 
+{
+  uint8_t cmd = _backLight;
+
+  for ( uint8_t i = 0; i < 4; i++ )
+  {
+    if ( value & 0x01 ) cmd |= _dataPin[i];
+    value >>= 1;
+  }
+  
+  _wire->beginTransmission(_address);
+  _wire->write(cmd | _enable);
+  // _wire->endTransmission();
+  // _wire->beginTransmission(_address);
+  _wire->write(cmd);
+  _wire->endTransmission();
+}
+
+
+//  -- END OF FILE --
+
diff --git a/libraries/I2C_LCD/I2C_LCD.h b/libraries/I2C_LCD/I2C_LCD.h
new file mode 100644
index 000000000..9866b9e00
--- /dev/null
+++ b/libraries/I2C_LCD/I2C_LCD.h
@@ -0,0 +1,69 @@
+#pragma once
+//
+//    FILE: I2C_LCD.h
+//  AUTHOR: Rob.Tillaart@gmail.com
+// VERSION: 0.1.0
+//    DATE: 2023-12-16
+// PUPROSE: Arduino library for I2C_LCD
+//     URL: https://github.com/RobTillaart/I2C_LCD
+
+
+#define I2C_LCD_LIB_VERSION     (F("0.1.0"))
+
+#include "Arduino.h"
+#include "Wire.h"
+
+
+class I2C_LCD : public Print
+{
+public:
+  explicit  I2C_LCD(uint8_t address, TwoWire * wire = &Wire);
+
+  void      config(uint8_t address, uint8_t enable, uint8_t readwrite, uint8_t registerselect, 
+                   uint8_t data4, uint8_t data5, uint8_t data6, uint8_t data7, uint8_t backlight);
+
+  void      begin(uint8_t cols = 20, uint8_t rows = 4);
+
+  void      setBacklight(bool on);   //  backlight() / noBacklight()
+
+  void      display();
+  void      noDisplay();
+
+  void      clear();
+  void      home();
+  void      setCursor(uint8_t col, uint8_t row);
+
+
+//  TODO private..
+
+  //  PRINT INTERFACE
+  size_t    write(uint8_t c);
+
+  void      sendData(uint8_t value);
+  void      sendCommand(uint8_t value);
+  void      write4bits(uint8_t value);
+
+
+private:
+  uint8_t   _address = 0;
+  TwoWire * _wire = NULL;
+
+  //  defaults
+  uint8_t   _enable;
+  uint8_t   _readWrite;
+  uint8_t   _registerSelect;
+  uint8_t   _backLight;
+  uint8_t   _dataPin[4];
+
+  //  TODO backlight status
+
+  uint8_t   _cols = 20;
+  uint8_t   _rows = 4;
+
+  bool      _pinsInOrder;
+  
+};
+
+
+//  -- END OF FILE --
+
diff --git a/libraries/I2C_LCD/LICENSE b/libraries/I2C_LCD/LICENSE
new file mode 100644
index 000000000..16ef15510
--- /dev/null
+++ b/libraries/I2C_LCD/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023-2023 Rob Tillaart
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/libraries/I2C_LCD/README.md b/libraries/I2C_LCD/README.md
new file mode 100644
index 000000000..02c06999e
--- /dev/null
+++ b/libraries/I2C_LCD/README.md
@@ -0,0 +1,155 @@
+
+[![Arduino CI](https://github.com/RobTillaart/I2C_LCD/workflows/Arduino%20CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)
+[![Arduino-lint](https://github.com/RobTillaart/I2C_LCD/actions/workflows/arduino-lint.yml/badge.svg)](https://github.com/RobTillaart/I2C_LCD/actions/workflows/arduino-lint.yml)
+[![JSON check](https://github.com/RobTillaart/I2C_LCD/actions/workflows/jsoncheck.yml/badge.svg)](https://github.com/RobTillaart/I2C_LCD/actions/workflows/jsoncheck.yml)
+[![GitHub issues](https://img.shields.io/github/issues/RobTillaart/I2C_LCD.svg)](https://github.com/RobTillaart/I2C_LCD/issues)
+
+[![License: MIT](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/RobTillaart/I2C_LCD/blob/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/RobTillaart/I2C_LCD.svg?maxAge=3600)](https://github.com/RobTillaart/I2C_LCD/releases)
+[![PlatformIO Registry](https://badges.registry.platformio.org/packages/robtillaart/library/I2C_LCD.svg)](https://registry.platformio.org/libraries/robtillaart/I2C_LCD)
+
+
+# I2C_LCD
+
+Arduino library for I2C_LCD  LCD displays.
+
+
+## Description
+
+Experimental library for the I2C LCD display, typical 20 x 4 characters.
+
+The goal of the library is to minimize footprint and improve performance.
+This is partly done by dedicate the library to I2C only.
+
+The library is inspired by the excellent LiquidCrystel_I2C library of F. Malpartida.
+- https://github.com/fmalpartida/New-LiquidCrystal
+
+The library implements the print interface, so all data types are printable.
+
+
+#### Compatibility
+
+Not 100% compatible with F. Malpartida's I2C library, however the differences are 
+not that large.
+Furthermore the 0.1.0 version does not support all functionality so there is still
+a lot to implement.
+So if you need such functionality, you still should use the **New-liquidCrystal** library.
+
+
+#### Tests
+
+Only tested on an UNO and a 20 x 4 character LCD.
+
+
+## Performance
+
+The most important optimization is to send a byte in a single I2C transaction.
+This takes 5 bytes to transport, which is 3 less than the reference.
+
+Furthermore there is an optimization if the pins are in order, as then
+it is far easier to get the nibble (half bytes).
+
+First performance tests are good. See example **I2C_LCD_performance.ino**.
+
+The performance measurement is done on an UNO, pins are in order.
+
+|  I2C clock  |  time (us)  |  notes  |
+|:-----------:|:-----------:|:-------:|
+|  100000     |     4316    |
+|  200000     |     2440    |
+|  300000     |     1780    |
+|  400000     |     1496    |  recommended 
+|  500000     |     1308    |
+|  600000     |     1176    |
+|  700000     |     1076    |
+|  800000     |     1024    |
+
+
+#### Related
+
+- https://github.com/fmalpartida/New-LiquidCrystal
+
+
+
+## Interface
+
+```cpp
+#include "I2C_LCD.h"
+```
+
+#### Constructor
+
+- **I2C_LCD(uint8_t address, TwoWire \* wire = &Wire)** Constructor, 
+mandatory address and optional alternative I2C bus.
+- **void config(uint8_t address, uint8_t enable, uint8_t readwrite, uint8_t registerselect, 
+                   uint8_t data4, uint8_t data5, uint8_t data6, uint8_t data7, 
+                   uint8_t backlight)** pin configuration.
+Will change in the future.
+- **void begin(uint8_t cols = 20, uint8_t rows = 4)** initializes library size.
+
+
+#### Other
+
+- **void setBacklight(bool on)** not implemented yet
+- **void display()** set display on
+- **void noDisplay()** set display off
+- **void clear()** clear the screen and set cursor to 0, 0.
+- **void home()** set cursor to 0, 0.
+- **void setCursor(uint8_t col, uint8_t row)** set cursor to given position.
+There is no check yet if this is out of range.
+
+
+#### Print interface
+
+- **size_t write(uint8_t c)**
+
+Array writing not supported.
+
+
+#### Low level API
+
+In the first version these are public, however they probably should be private.
+
+- **void sendData(uint8_t value)**
+- **void sendCommand(uint8_t value)**
+- **void write4bits(uint8_t value)**
+
+
+## Future
+
+#### Must
+
+- update documentation
+
+#### Should
+
+- fix TODO's in code
+- implement functional range
+- test with other platforms
+- test with other display sizes
+- test more
+- make a PR for New-LiquidCrystal library to implement there too.
+
+
+#### Could
+
+- implement unit tests (possible?)
+- add examples
+  - Wire1, Wire2 etc
+- solve MAGIC numbers (defaults)
+- add timestamp last print
+- position control in write().
+
+
+#### Wont
+
+
+
+## Support
+
+If you appreciate my libraries, you can support the development and maintenance.
+Improve the quality of the libraries by providing issues and Pull Requests, or
+donate through PayPal or GitHub sponsors.
+
+Thank you,
+
diff --git a/libraries/I2C_LCD/examples/I2C_LCD_demo/I2C_LCD_demo.ino b/libraries/I2C_LCD/examples/I2C_LCD_demo/I2C_LCD_demo.ino
new file mode 100644
index 000000000..eca4a6d5d
--- /dev/null
+++ b/libraries/I2C_LCD/examples/I2C_LCD_demo/I2C_LCD_demo.ino
@@ -0,0 +1,69 @@
+//    FILE: I2C_LCD_demo.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo I2C_LCD library
+//     URL: todo
+
+
+#include "Arduino.h"
+#include "Wire.h"
+
+#include "I2C_LCD.h"
+
+
+#define BACKLIGHT_PIN   3
+#define En_pin          2
+#define Rw_pin          1
+#define Rs_pin          0
+#define D4_pin          4
+#define D5_pin          5
+#define D6_pin          6
+#define D7_pin          7
+
+
+I2C_LCD lcd(39);
+
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println(__FILE__);
+  Serial.print("I2C_LCD_LIB_VERSION: ");
+  Serial.println(I2C_LCD_LIB_VERSION);
+  Serial.println();
+
+  lcd.config(39, En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin, BACKLIGHT_PIN);
+
+  Wire.begin();
+  Wire.setClock(400000);
+  lcd.begin(20, 4);
+
+  lcd.display();
+  delay(1000);
+  lcd.noDisplay();
+  delay(1000);
+  lcd.display();
+
+  lcd.clear();
+
+  lcd.home();
+  lcd.setCursor(3, 3);
+
+  uint32_t start = micros();
+  lcd.print(__TIME__);
+  uint32_t stop = micros();
+
+  lcd.setCursor(10, 0);
+  lcd.print(stop - start);
+}
+
+
+void loop()
+{
+  lcd.home();
+  lcd.print(millis());
+  delay(1000);
+}
+
+
+//  -- END OF FILE --
diff --git a/libraries/I2C_LCD/examples/I2C_LCD_performance/I2C_LCD_performance.ino b/libraries/I2C_LCD/examples/I2C_LCD_performance/I2C_LCD_performance.ino
new file mode 100644
index 000000000..c6eaf53a5
--- /dev/null
+++ b/libraries/I2C_LCD/examples/I2C_LCD_performance/I2C_LCD_performance.ino
@@ -0,0 +1,85 @@
+//    FILE: I2C_LCD_performance.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: per I2C_LCD library
+//     URL: https://github.com/RobTillaart/I2C_LCD
+
+
+#include "Arduino.h"
+#include "Wire.h"
+
+#include "I2C_LCD.h"
+
+
+#define BACKLIGHT_PIN   3
+#define En_pin          2
+#define Rw_pin          1
+#define Rs_pin          0
+#define D4_pin          4
+#define D5_pin          5
+#define D6_pin          6
+#define D7_pin          7
+
+
+I2C_LCD lcd(39);
+
+void performance(uint32_t speed)
+{
+  Serial.println(__FUNCTION__);
+  Serial.print("speed:\t");
+  Serial.println(speed);
+  delay(100);
+
+  Wire.setClock(speed);
+  lcd.setCursor(3, 3);
+
+  uint32_t start = micros();
+  lcd.print(__TIME__);
+  uint32_t stop = micros();
+
+  Serial.print("time (us): ");
+  Serial.println(stop - start);
+  Serial.println();
+  delay(100);
+}
+
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println(__FILE__);
+  Serial.print("I2C_LCD_LIB_VERSION: ");
+  Serial.println(I2C_LCD_LIB_VERSION);
+  Serial.println();
+
+  lcd.config(39, En_pin, Rw_pin, Rs_pin, D4_pin, D5_pin, D6_pin, D7_pin, BACKLIGHT_PIN);
+
+  Wire.begin();
+  Wire.setClock(400000);
+  lcd.begin(20, 4);
+
+  lcd.display();
+  delay(1000);
+  lcd.noDisplay();
+  delay(1000);
+  lcd.display();
+
+  lcd.clear();
+
+  for (uint32_t speed = 100000; speed <= 800000; speed += 100000)
+  {
+    performance(speed);
+  }
+  Wire.setClock(100000);
+}
+
+
+void loop()
+{
+  lcd.home();
+  lcd.print(millis());
+  delay(1000);
+}
+
+
+//  -- END OF FILE --
diff --git a/libraries/I2C_LCD/examples/I2C_LCD_performance/performance_0.1.0.txt b/libraries/I2C_LCD/examples/I2C_LCD_performance/performance_0.1.0.txt
new file mode 100644
index 000000000..72735ac2f
--- /dev/null
+++ b/libraries/I2C_LCD/examples/I2C_LCD_performance/performance_0.1.0.txt
@@ -0,0 +1,42 @@
+
+IDE:     1.8.19
+Board:   UNO
+
+
+I2C_LCD\examples\I2C_LCD_performance\I2C_LCD_performance.ino
+I2C_LCD_LIB_VERSION: 0.1.0
+
+performance
+speed:	100000
+time (us): 4316
+
+performance
+speed:	200000
+time (us): 2440
+
+performance
+speed:	300000
+time (us): 1780
+
+performance
+speed:	400000
+time (us): 1496
+
+performance
+speed:	500000
+time (us): 1308
+
+performance
+speed:	600000
+time (us): 1176
+
+performance
+speed:	700000
+time (us): 1076
+
+performance
+speed:	800000
+time (us): 1024
+
+
+
diff --git a/libraries/I2C_LCD/keywords.txt b/libraries/I2C_LCD/keywords.txt
new file mode 100644
index 000000000..c28355a2c
--- /dev/null
+++ b/libraries/I2C_LCD/keywords.txt
@@ -0,0 +1,40 @@
+# Syntax Colouring Map For I2C_LCD
+
+# Data types (KEYWORD1)
+I2C_LCD	KEYWORD1
+
+
+# Methods and Functions (KEYWORD2)
+begin	KEYWORD2
+config	KEYWORD2
+
+setBacklight	KEYWORD2
+
+display	KEYWORD2
+noDisplay	KEYWORD2
+
+clear	KEYWORD2
+home	KEYWORD2
+setCursor	KEYWORD2
+
+
+# LOW LEVEL API
+write	KEYWORD2
+sendData	KEYWORD2
+sendCommand	KEYWORD2
+write4bits	KEYWORD2
+
+
+
+# Constants (LITERAL1)
+I2C_LCD_LIB_VERSION	LITERAL1
+
+AD9833_MAX_FREQ	LITERAL1
+AD9833_MAX_PHASE	LITERAL1
+
+AD9833_OFF	LITERAL1
+AD9833_SINE	LITERAL1
+AD9833_SQUARE1	LITERAL1
+AD9833_SQUARE2	LITERAL1
+AD9833_TRIANGLE	LITERAL1
+
diff --git a/libraries/I2C_LCD/library.json b/libraries/I2C_LCD/library.json
new file mode 100644
index 000000000..a68c77dec
--- /dev/null
+++ b/libraries/I2C_LCD/library.json
@@ -0,0 +1,23 @@
+{
+  "name": "I2C_LCD",
+  "keywords": "HD44780, 20x4",
+  "description": "Arduino library for I2C_LCD.",
+  "authors":
+  [
+    {
+      "name": "Rob Tillaart",
+      "email": "Rob.Tillaart@gmail.com",
+      "maintainer": true
+    }
+  ],
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/RobTillaart/I2C_LCD.git"
+  },
+  "version": "0.1.0",
+  "license": "MIT",
+  "frameworks": "*",
+  "platforms": "*",
+  "headers": "I2C_LCD.h"
+}
diff --git a/libraries/I2C_LCD/library.properties b/libraries/I2C_LCD/library.properties
new file mode 100644
index 000000000..02a11c19f
--- /dev/null
+++ b/libraries/I2C_LCD/library.properties
@@ -0,0 +1,11 @@
+name=I2C_LCD
+version=0.1.0
+author=Rob Tillaart <rob.tillaart@gmail.com>
+maintainer=Rob Tillaart <rob.tillaart@gmail.com>
+sentence=Arduino library for I2C_LCD.
+paragraph=HD44780, 20x4
+category=Display
+url=https://github.com/RobTillaart/I2C_LCD
+architectures=*
+includes=I2C_LCD.h 
+depends=
diff --git a/libraries/I2C_LCD/test/unit_test_001.cpp b/libraries/I2C_LCD/test/unit_test_001.cpp
new file mode 100644
index 000000000..3c758d983
--- /dev/null
+++ b/libraries/I2C_LCD/test/unit_test_001.cpp
@@ -0,0 +1,59 @@
+//
+//    FILE: unit_test_001.cpp
+//  AUTHOR: Rob Tillaart
+//    DATE: 2023-12-17
+// PURPOSE: unit tests for the I2C_LCD 
+//          https://github.com/RobTillaart/I2C_LCD
+//          https://github.com/Arduino-CI/arduino_ci/blob/master/REFERENCE.md
+//
+
+// supported assertions
+// ----------------------------
+// assertEqual(expected, actual)
+// assertNotEqual(expected, actual)
+// assertLess(expected, actual)
+// assertMore(expected, actual)
+// assertLessOrEqual(expected, actual)
+// assertMoreOrEqual(expected, actual)
+// assertTrue(actual)
+// assertFalse(actual)
+// assertNull(actual)
+
+#include <ArduinoUnitTests.h>
+
+#include "Arduino.h"
+#include "I2C_LCD.h"
+
+
+unittest_setup()
+{
+  fprintf(stderr, "I2C_LCD_LIB_VERSION: %s\n", (char *) I2C_LCD_LIB_VERSION);
+}
+
+
+unittest_teardown()
+{
+}
+
+
+unittest(test_constants)
+{
+  assertEqual(1, 1);
+}
+
+
+unittest(test_constructor)
+{
+  I2C_LCD lcd(0x39);
+
+  assertEqual(1, 1);
+}
+
+
+
+unittest_main()
+
+
+//  -- END OF FILE --
+
+