Microcontroller › 8051 › 4×4 keypad with 8255 › Hi Nicolai,Ya, that might be
June 28, 2013 at 4:08 am #10046
Ya, that might be due to the absence of pullup/pulldown resistors. Could you please post your circuit also. Also tell me whether you are checking for a high value or low value to detect a key pressed.