Arduino Analog Output

The PWM feature on the Arduino enables you to simulate an analog output voltage on specific digital

interfaces. The function to use the PWM feature is the analogWrite

analogWrite(pin, dutycycle);

Example Code

int analogInPin = A0;

int analogOutPin = 9;               // Analog output pin that the LED is attached to

int analogValue = 0;                 // value output to the PWM (analog out)

void setup() {

  Serial.begin(9600);                 // initialize serial communications at 9600 bps:

}

void loop() {

  analogValue = map(analogRead(A0), 0, 1023, 0, 255);       // read the analog in value with map

  Serial.print("analogValue = ");                                            // print the results to the Serial Monitor:

  Serial.println(analogValue);

  analogWrite(analogOutPin, analogValue);                          // change the analog out value:

  delay(1000);                                                                         // wait 1 seconds

}