I’m having trouble getting my 16x2 LCD to display anything when used with the Adafruit I2C LCD backpack on a Rpi Model A. I also have an Arduino Uno to compare with and I’ve successfully verified that both the backpack and LCD work.
On the Rpi I am using pin2 5v for VCC, pin 6 for GND, pin3 SDA for DAT and pin5 SCL for CLK. I’ve checked if the I2C device is active and it is at address 20, and also specified this in the library. I have tried 2 libraries (https://gist.github.com/DenisFromHR/cc863375a6e19dce359d) which run without errors but just nothing is displayed on screen. I have the LCD contrast turned right up too but still nothing. I’ve also moved VCC to pin 1 (3.3v) but the result was the same. Has anyone successfully used the LCD and backpack together on a RPi ? if so please help.