Difference between revisions of "2 Read Switch and Display on LED"
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<syntaxhighlight> | <syntaxhighlight> | ||
/* | /* | ||
− | + | Read Switch and Display on LED | |
− | Turns on and off a light emitting diode(LED) connected to digital | + | |
− | pin 13, when pressing a pushbutton attached to pin 2. | + | Turns on and off a light emitting diode(LED) connected to digital |
+ | pin 13, when pressing a pushbutton attached to pin 2. | ||
+ | |||
+ | |||
The circuit: | The circuit: | ||
* LED attached from pin 13 to ground | * LED attached from pin 13 to ground | ||
Line 14: | Line 17: | ||
* Note: on most Arduinos there is already an LED on the board | * Note: on most Arduinos there is already an LED on the board | ||
attached to pin 13. | attached to pin 13. | ||
− | / | + | |
+ | */ | ||
// set pin numbers: | // set pin numbers: | ||
const int buttonPin = 2; // the number of the pushbutton pin | const int buttonPin = 2; // the number of the pushbutton pin | ||
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} | } | ||
} | } | ||
+ | |||
</syntaxhighlight> | </syntaxhighlight> |
Latest revision as of 10:07, 16 September 2014
Code
- /*
- Read Switch and Display on LED
- 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.
- */
- // 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);
- }
- }