Switch into Arduino

arduino_basic_switch.pde

// Detect a Switch 
// Example to detect a switch press
// Developed for the Developing Assistive Technology class 

int switchPin = 2; 
int switchValue = 0;

int ledPin = 13;
int counter = 0;

void setup() {
  
  pinMode(switchPin, INPUT); //set switch pin as INPUT
  pinMode(ledPin, OUTPUT); //set led pin as OUTPUT
  
}

void loop() {
  switchValue = digitalRead(switchPin); //get the switch's current value

  if (switchValue == HIGH) {    
    
    digitalWrite(ledPin, HIGH); //turn LED on
    
  } else {
    
    digitalWrite(ledPin, LOW);  // turn LED off

  }

}