Your problem in LCD contrast | Microcontroller › 8051 › problem in LCD and CIRCUIT in “Keypad based simple electronic lock using 8051 microcontroller (AT89C51) › Your problem in LCD contrast November 19, 2011 at 3:42 am #6852 utpal duttaParticipant Your problem in LCD contrast controll circuit. Have you use any preset in pin no. 3 of LCD. If yes, then controll it your letters will be illuminated.
