Schakelaar

/*
Button

Turns on and off a light emitting diode(LED) connected to digital pin 13,
when pressing a pushbutton attached to pin 2.

The circuit:

  • LED attached from pin 13 to ground
  • pushbutton attached to pin 2 from +5V
  • 10K resistor attached to pin 2 from ground
  • Note: on most Arduinos there is already an LED on the board
    attached to pin 13. created 2005
    by DojoDave http://www.0j0.org
    modified 30 Aug 2011
    by Tom Igoe This example code is in the public domain. http://www.arduino.cc/en/Tutorial/Button
    */

// constants won’t change. They’re used here to set pin numbers:
const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin

// variables will change:
int buttonState = 0; // variable for reading the pushbutton status

void setup() {
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
}

void loop() {
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);

// check if the pushbutton is pressed. If it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:
digitalWrite(ledPin, HIGH);
} else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}