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  1. Hi, II've tested Lincomatic liquidTW2 library ( https://github.com/lincomatic/LiquidTWI2/ ) with an Adafuit i2c LCD backpack (http://www.adafruit.com/product/292 ). with a bidirectional i2c level translator, since backpack and lcd are 5V. Unfortunately, it does not works out of the box. However, this can be solved easily by inserting a delay BEFORE using the lcd.begin, an an other delay before sending first string. I suspect init time was shorted too much in the library, and because C3200 is much more fast than an arduino, fisrts strings where sent before complete lcd init; In bold in the following source, the two lines added from library example. /* Demonstration sketch for Adafruit i2c/SPI LCD backpack using MCP23008 I2C expander ( http://www.ladyada.net/products/i2cspilcdbackpack/index.html ) This sketch prints "Hello World!" to the LCD and shows the time. The circuit: * 5V to Arduino 5V pin * GND to Arduino GND pin * CLK to Analog #5 * DAT to Analog #4 */ // include the library code: #include <Wire.h> #include <LiquidTWI2.h> // Connect via i2c, default address #0 (A0-A2 not jumpered) LiquidTWI2 lcd(0); void setup() { // set the LCD type lcd.setMCPType(LTI_TYPE_MCP23008); delay(50); // lcd.setMCPType(LTI_TYPE_MCP23017); // set up the LCD's number of rows and columns: lcd.begin(20, 4); delay(50); // Print a message to the LCD. lcd.print("hello, world!"); } void loop() { // set the cursor to column 0, line 1 // (note: line 1 is the second row, since counting begins with 0): lcd.setCursor(0, 1); // print the number of seconds since reset: lcd.print(millis()/1000); lcd.setBacklight(HIGH); delay(500); lcd.setBacklight(LOW); delay(500); }