Some readers/keypads may want HIGH (5v) rather than LOW (0v) to activate the beep/LED.
This should be evaluated at init stage, NOT at an if statement stage when required (i.e. change the value written to the pin at init stage, and do this by variable)
Some readers/keypads may want HIGH (5v) rather than LOW (0v) to activate the beep/LED.
This should be evaluated at init stage, NOT at an if statement stage when required (i.e. change the value written to the pin at init stage, and do this by variable)