We used a 1602 I2C LCD purchased from amazon. The LCD is clearly marked with GND, VCC SDA and SCL.
The LCD SDA > Pin 20 on the Arduino Mega
The LCD SCL > Pin 21 on the Arduino Mega
The LCD GND > GND on the Arduino Mega
The LCD VCC > +5V on the Arduino Mega
There is an adjustment for the backlight on a potentiometer on the back.
If you don't know the I2C address of the LCD display see the I2C Scanner Project here
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