I2C 16x2 Arduino LCD Display Module FAQ【DFR0063】

Q1.Why does my screen not light up or display very dimly after uploading the program? 

A1.Please check whether the backlight of the screen is on normally, and how to adjust the potentiometer on the back of the screen with a screwdriver until the characters are clearly displayed.

If you have other questions, just feel free to post them in our forum for consultation. We will reply them as soon as possible and improve the product FAQ gradually.