The key Switch module work as switch which is on when button is pressed and off when it’s not , so when the button is not pressed  high signal is received at the digital pin and when the button is pressed the current passes through the switch and a low signal is received at the digital pin ,advantage of using key switch module is ,  it has in built pull up resistor which will pull digital pin high when switch is not pressed.


Before proceeding further in to this tutorial go through  evive digital input and Tactile switch tutorials which will give you some idea about digital input and why we use pull-up and pull-down resistors.

Circuit Diagram

  • Connect signal pin of key switch module to pin number 10 of evive
  • Connect middle pin to VCC
  • Connect pin having ‘-‘ sign on board to GND 



So when switch of the key switch module  is pressed , digital pin will read low signal and high when switch is not pressed  , also the state of the digital pin will be displayed on TFT display.

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