| /* | |
| 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 through 220 ohm resistor | |
| - 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. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/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); | |
| } | |
| } | |