KY-004: Key switch

KEYES ARDUINO key switch module

When the key is pressed the built-in LED on pin 13 will be turned off. Connecting to the Arduino

  • Pin - = GND, connect to GND of the Arduino
  • Pin (middel pin) +5 v, connect to Arduino +5
  • Pin S signal, connect to Arduino pin 10

Example code

int Led = 13 ;// define LED Interface
int buttonpin = 10; // define the key switch sensor interface
int val ;// define numeric variables val
void setup ()
{
pinMode (Led, OUTPUT); // define LED as output interface
pinMode (buttonpin, INPUT); // define the key switch sensor output interface
}
void loop ()
{
val = digitalRead (buttonpin); // digital interface will be assigned a value of 3 to read val
if (val == HIGH)  // When the key switch when the sensor detects a signal, LED flashes
{
digitalWrite (Led, HIGH);
}
else
{
digitalWrite (Led, LOW);
} 
}