Difference between revisions of "2 Read Switch and Display on LED"

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    [[Category:Arduino Tutorials]]
    		 
    [[Category:Arduino Tutorials]]
     
    [[File:Arduino Read Switch and Display on LED.JPG|680px]]
    		 
    [[File:Arduino Read Switch and Display on LED.JPG|680px]]
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    ====Code====
     +
    <syntaxhighlight>
     +
    /*
     +
      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.
     +
     +
     +
    // constants won't change. They're used here to
     +
    // 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
     +
    // variables will change:
     +
    int buttonState = 0;        // variable for reading the pushbutton status
     +
    void setup() {
     +
      // initialize the LED pin as an output:
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      pinMode(ledPin, OUTPUT);     
     +
      // initialize the pushbutton pin as an input:
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      pinMode(buttonPin, INPUT);   
     +
    }
     +
    void loop(){
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      // read the state of the pushbutton value:
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      buttonState = digitalRead(buttonPin);
     +
      // 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);
     +
      }
     +
    }
     +
     +
    </syntaxhighlight>

    Revision as of 23:55, 12 September 2014

    Arduino Read Switch and Display on LED.JPG

    Code

    1. /*
    2.   Button
    3.  
    4.  Turns on and off a light emitting diode(LED) connected to digital  
    5.  pin 13, when pressing a pushbutton attached to pin 2. 
    6.  
    7.  
    8.  The circuit:
    9.  * LED attached from pin 13 to ground 
    10.  * pushbutton attached to pin 2 from +5V
    11.  * 10K resistor attached to pin 2 from ground
    12.  
    13.  * Note: on most Arduinos there is already an LED on the board
    14.  attached to pin 13.
    15.  
    16.  
    17. // constants won't change. They're used here to 
    18. // set pin numbers:
    19. const int buttonPin = 2;     // the number of the pushbutton pin
    20. const int ledPin =  13;      // the number of the LED pin
    21. // variables will change:
    22. int buttonState = 0;         // variable for reading the pushbutton status
    23. void setup() {
    24.   // initialize the LED pin as an output:
    25.   pinMode(ledPin, OUTPUT);      
    26.   // initialize the pushbutton pin as an input:
    27.   pinMode(buttonPin, INPUT);     
    28. }
    29. void loop(){
    30.   // read the state of the pushbutton value:
    31.   buttonState = digitalRead(buttonPin);
    32.   // check if the pushbutton is pressed.
    33.   // if it is, the buttonState is HIGH:
    34.   if (buttonState == HIGH) {     
    35.     // turn LED on:    
    36.     digitalWrite(ledPin, HIGH);  
    37.   } 
    38.   else {
    39.     // turn LED off:
    40.     digitalWrite(ledPin, LOW); 
    41.   }
    42. }
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