Arduino and KY-004 Key Switch Module

Parts Required

You can connect to the module using dupont style jumper wire.

This should work with other Arduino board – I have tried an Uno and Mega

Name		Link
Arduino Uno		Aliexpress link Amazon Ebay
37 in one sensor kit		Aliexpress link Amazon link
Connecting cables		Aliexpress link Amazon Ebay

Schematic/Connection

Code Example

int led = 13; //Define the LED pin
int buttonpin = 3; //Define the push button pin
int val; //Define a numeric variable

void setup()
{
  pinMode(led,OUTPUT);
  pinMode(buttonpin,INPUT);
}

void loop()
{
  val = digitalRead(buttonpin); // check the state of the button
  if(val==HIGH) // if button is pressed, turn LED on
  {
    digitalWrite(led,HIGH);
  }
  else
  {
    digitalWrite(led,LOW);
  }
}

Serial Monitor Output

Press the switch and watch the onboard LED

Links