2 Read Switch and Display on LED
    Revision as of 09:36, 13 September 2014 by Sandeep (Talk | contribs)

    Arduino Read Switch and Display on LED.JPG

    Code

    1. /*
    2. Button
    3. Turns on and off a light emitting diode(LED) connected to digital  
    4. pin 13, when pressing a pushbutton attached to pin 2. 
    5.  The circuit:
    6.  * LED attached from pin 13 to ground 
    7.  * pushbutton attached to pin 2 from +5V
    8.  * 10K resistor attached to pin 2 from ground
    9.  
    10.  * Note: on most Arduinos there is already an LED on the board
    11.  attached to pin 13.
    12. // constants won't change. They're used here to 
    13. // set pin numbers:
    14. const int buttonPin = 2;     // the number of the pushbutton pin
    15. const int ledPin =  13;      // the number of the LED pin
    16. // variables will change:
    17. int buttonState = 0;         // variable for reading the pushbutton status
    18. void setup() {
    19.   // initialize the LED pin as an output:
    20.   pinMode(ledPin, OUTPUT);      
    21.   // initialize the pushbutton pin as an input:
    22.   pinMode(buttonPin, INPUT);     
    23. }
    24. void loop(){
    25.   // read the state of the pushbutton value:
    26.   buttonState = digitalRead(buttonPin);
    27.   // check if the pushbutton is pressed.
    28.   // if it is, the buttonState is HIGH:
    29.   if (buttonState == HIGH) {     
    30.     // turn LED on:    
    31.     digitalWrite(ledPin, HIGH);  
    32.   } 
    33.   else {
    34.     // turn LED off:
    35.     digitalWrite(ledPin, LOW); 
    36.   }
    37. }
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