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  • I feel like I am really missing something here. I have a 1602 display with an ic2 backpack. I am connecting it to a MDBT42Q Breakout, and using this doc: http://www.espruino.com/HD44780

    I have tried different pins. I have also added pull up resistors from vcc (5v) to scl and sda

    Here is the error I get. ...

    >Uncaught InternalError: I2C Write Error 33281
     at line 2 col 13
    g|4,g|4,g,g])
                ^
    in function "a" called from line 1 col 7
    a(51,1);a(50,1);a(40,1);a(12,1);a(6,1);a­(1,1);return{write:a...
          ^
    in function "h" called from line 2 col 15
    g|4,g|4,g,g])})
                  ^
    in function "connectI2C" called from line 2 col 45
    var lcd = require("HD44780").connectI2C(I2C1);
                                                ^
    Uncaught Error: Cannot read property 'print' of undefined
     at line 3 col 4
    lcd.print("Hello World!");
       ^
    
  • The MDBT42Q is a 3.3V device, so it's possible that you won't be able to communicate with the 5V LCD.
    Maybe there is some solution for I2C level shifting?

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