| /* |
| 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); |
| } |
| } |