Simple on/off push button logic. Contribute to Nigel2392/arduino-uno-pushbutton-led development by creating an account on GitHub.

To read each button push, the Arduino brings one keypad input line high and checks the voltage of the four output lines in order. The diodes on the PC board prevent feedback across the rows and ...

Initially, one end of the push button was connected to pin 13 of the Arduino. However, this caused unreliable button behavior. This is because pin 13 is connected internally to the onboard LED, which ...