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48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
/*
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Analog Input
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Demonstrates analog input by reading an analog sensor on analog pin 0 and
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turning on and off a light emitting diode(LED) connected to digital pin 13.
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The amount of time the LED will be on and off depends on
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the value obtained by analogRead().
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The circuit:
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* Potentiometer attached to analog input 0
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* 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
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* LED anode (long leg) attached to digital output 13
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* LED cathode (short leg) attached to ground
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* Note: because most Arduinos have a built-in LED attached
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to pin 13 on the board, the LED is optional.
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Created by David Cuartielles
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Modified 16 Jun 2009
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By Tom Igoe
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http://arduino.cc/en/Tutorial/AnalogInput
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*/
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int sensorPin = 0; // 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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} |