have you connected pot on pin | Microcontroller › 8051 › 16*2 LCD displaying black boxes while interfacing with 8051 › have you connected pot on pin April 19, 2014 at 6:33 pm #11590 Ashutosh BhattParticipant have you connected pot on pin number 3 of LCD? if no then connect it if yes then vary it to change brightness ur program seems to be correct but you can test it on proteus simulator
