i have connected a magstrip reader to my mega2650 i can get it to read most of the time one of the inputs it use is card detected. in my test proram i have led 13 lighting up when the input (using pin 4) detects the card in
when a card in inserted into reader it grounds that pin
the problem is if i move my hand close to the reader it will trigger that pin 4 input.
what can i do to the connection at pin 4 to keep the interference out and ensure it only detects when the switch is pushed
thanks in advance