New on this forum, I'd like ask question about using LCD 1602 keypad.
My problème is that I want to use digital pin 2 entry with a contact in pull up.
All works fine without LCD keypad, but with LCD keypad, the signal digitalRead(Contact) is sometime moving from 0 to 1 without pressing button or not moving at all when pressing
My pull up resistance is 10 K
Is there a problem using D2 or is the resistance OK
I tried 5K with the same issue
Thank you for your help