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[[Category:Arduino Tutorials]]
 
[[Category:Arduino Tutorials]]
 
[[File:Arduino Blink LED with POT.JPG|680px]]
 
[[File:Arduino Blink LED with POT.JPG|680px]]
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==Code==
 +
<syntaxhighlight>
 +
/*
 +
  Blink LED with POT
 +
Demonstrates analog input by reading an analog sensor on analog pin 0 and
 +
turning on and off a light emitting diode(LED)  connected to digital pin 13.
 +
The amount of time the LED will be on and off depends on
 +
the value obtained by analogRead().
 +
 +
The circuit:
 +
* Potentiometer attached to analog input 0
 +
* center pin of the potentiometer to the analog pin
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* one side pin (either one) to ground
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* the other side pin to +5V
 +
* LED anode (long leg) attached to digital output 13
 +
* LED cathode (short leg) attached to ground
 +
 +
* Note: because most Arduinos have a built-in LED attached
 +
to pin 13 on the board, the LED is optional.
 +
 +
*/
 +
int sensorPin = A0;    // select the input pin for the potentiometer
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int ledPin = 13;      // select the pin for the LED
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int sensorValue = 0;  // variable to store the value coming from the sensor
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void setup() {
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  // declare the ledPin as an OUTPUT:
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  pinMode(ledPin, OUTPUT); 
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}
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void loop() {
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  // read the value from the sensor:
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  sensorValue = analogRead(sensorPin);   
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  // turn the ledPin on
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  digitalWrite(ledPin, HIGH); 
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  // stop the program for <sensorValue> milliseconds:
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  delay(sensorValue);         
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  // turn the ledPin off:       
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  digitalWrite(ledPin, LOW); 
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  // stop the program for for <sensorValue> milliseconds:
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  delay(sensorValue);                 
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}
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</syntaxhighlight>

Latest revision as of 16:48, 15 September 2014

Arduino Blink LED with POT.JPG

Code

/*
  Blink LED with POT
 Demonstrates analog input by reading an analog sensor on analog pin 0 and
 turning on and off a light emitting diode(LED)  connected to digital pin 13. 
 The amount of time the LED will be on and off depends on
 the value obtained by analogRead(). 
 
 The circuit:
 * Potentiometer attached to analog input 0
 * center pin of the potentiometer to the analog pin
 * one side pin (either one) to ground
 * the other side pin to +5V
 * LED anode (long leg) attached to digital output 13
 * LED cathode (short leg) attached to ground
 
 * Note: because most Arduinos have a built-in LED attached 
 to pin 13 on the board, the LED is optional.
 
 */
int sensorPin = A0;    // select the input pin for the potentiometer
int ledPin = 13;      // select the pin for the LED
int sensorValue = 0;  // variable to store the value coming from the sensor
void setup() {
  // declare the ledPin as an OUTPUT:
  pinMode(ledPin, OUTPUT);  
}
void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);    
  // turn the ledPin on
  digitalWrite(ledPin, HIGH);  
  // stop the program for <sensorValue> milliseconds:
  delay(sensorValue);          
  // turn the ledPin off:        
  digitalWrite(ledPin, LOW);   
  // stop the program for for <sensorValue> milliseconds:
  delay(sensorValue);                  
}