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<syntaxhighlight>
 
<syntaxhighlight>
 
/*
 
/*
   Button
+
   Read Switch and Display on LED
 
   
 
   
 
  Turns on and off a light emitting diode(LED) connected to digital   
 
  Turns on and off a light emitting diode(LED) connected to digital   
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  attached to pin 13.
 
  attached to pin 13.
 
   
 
   
   
+
  */
// constants won't change. They're used here to
+
 
// 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

Arduino Read Switch and Display on LED.JPG

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); 
  }
}