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56 lines
1.3 KiB
C++
56 lines
1.3 KiB
C++
/*
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Button
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Turns on and off a light emitting diode(LED) connected to digital
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pin 13, when pressing a pushbutton attached to pin 2.
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The circuit:
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* LED attached from pin 13 to ground
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* pushbutton attached to pin 2 from +5V
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* 10K resistor attached to pin 2 from ground
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* Note: on most Arduinos there is already an LED on the board
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attached to pin 13.
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created 2005
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by DojoDave <http://www.0j0.org>
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modified 30 Aug 2011
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by Tom Igoe
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This example code is in the public domain.
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http://www.arduino.cc/en/Tutorial/Button
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*/
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// constants won't change. They're used here to
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// set pin numbers:
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const int buttonPin = 2; // the number of the pushbutton pin
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const int ledPin = 13; // the number of the LED pin
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// variables will change:
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int buttonState = 0; // variable for reading the pushbutton status
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void setup() {
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// initialize the LED pin as an output:
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pinMode(ledPin, OUTPUT);
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// initialize the pushbutton pin as an input:
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pinMode(buttonPin, INPUT);
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}
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void loop() {
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// read the state of the pushbutton value:
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buttonState = digitalRead(buttonPin);
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// check if the pushbutton is pressed.
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// if it is, the buttonState is HIGH:
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if (buttonState == HIGH) {
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// turn LED on:
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digitalWrite(ledPin, HIGH);
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}
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else {
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// turn LED off:
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digitalWrite(ledPin, LOW);
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}
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} |