VariableLED.ino

/*

  VariableLED

  Based on the Arduino AnalogInOutSerial example http://arduino.cc/en/Tutorial/AnalogInOutSerial

  Analog input, analog output, serial output

  Reads an analog input pin, maps the result to a range from 0 to 255
  and uses the result to set the pulsewidth modulation (PWM) of an output pin.
  Also prints the results to the serial monitor.

  The circuit:
  * potentiometer connected to analog pin 0.
    Center pin of the potentiometer goes to the analog pin.
    side pins of the potentiometer go to +5V and ground
  * LED connected from digital pin 9 to ground

  created 29 Dec. 2008
  modified 9 Apr 2012
  by Tom Igoe

  This example code is in the public domain.

  For info and circuit diagrams see https://github.com/tardate/LittleArduinoProjects/tree/master/playground/VariableLED

 */

// These constants won't change.  They're used to give names to the pins used:
const int analogInPin = A0; // Analog input pin that the potentiometer is attached to
const int analogOutPin = 9; // PWM output pin that the LED is attached to

int sensorValue = 0; // value read from the pot
int outputValue = 0; // value output to the PWM (analog out)

void setup() {
  Serial.begin(115200); // initialize serial communications
}

void loop() {
  // read the analog in value:
  sensorValue = analogRead(analogInPin);
  // map it to the range of the analog out:
  outputValue = map(sensorValue, 0, 1023, 0, 255);

  // change the analog out value:
  analogWrite(analogOutPin, outputValue);
  logSettings(sensorValue, outputValue);

  // wait 2 milliseconds before the next loop
  // for the analog-to-digital converter to settle
  // after the last reading:
  delay(2);
}

// print the results to the serial monitor:
void logSettings(int reading, int setting) {
  Serial.print("Sensor: ");
  Serial.print(reading);
  Serial.print(", LED: ");
  Serial.println(setting);
}