check the power supply if u | Miscellaneous › Others › Circuit diagram for 4*4 keypad interfaced with P89V51RD2 › check the power supply if u June 1, 2011 at 5:10 pm #6318 Ankit RakeshParticipant check the power supply if u are using and adaptor then change te adaptor and see if the numbers are already dispalying without any key is pressed
