Push The Button Using The Key Switch Module

A key switch module is a push button device that would provide an output HIGH signal when the button has been pressed. The module contains a tactile push button switch and a resistor.

Connection
Connect the "-" pin to GND of Arduino, the middle pin to 5V of Arduino, ​and the "S" pin to any digital pin of Arduino. In our code example, the "S" pin is connected to digital pin 4 of Arduino.

Module	Arduino
"-"	GND
middle pin	5V
"S"	4

Upload the code and test the module. The LED should turned on when the button has been pressed, and turned off when it is not pressed.