Arduino Experiment

arduino.pde

/*
 * Set LED brightness by serial write
 * An Arduino experiment
 * by Brian Morton
 */
 
int ledPin = 9;
int brightness = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
  Serial.println("Waiting for input...");
}

char buffer[3];
int x;

void loop() {
  if (Serial.available() > 0) {
    delay(5); // make sure we have all the data
    
    // Buffer a possible 3 digits for our integer
    for (int i = 0; i < 3; i++) {
      buffer[i] = Serial.read();
    }
    
    Serial.flush();
    x = atoi(buffer);

    Serial.print("Setting brightness to: ");
    Serial.println(x);
    brightness = x;
  }
  
  analogWrite(ledPin, brightness);
}