Light Sensor code for the Emerging Objects class.

lightsensor.ino

//Light Sensor Code

int led = 13;

int led2 = 11;

byte fade;
long timer;
long previousTimer;
int ledState = LOW;
int sensorPin = A0; 
int sensorValue = 0;
// the setup routine runs once when you press reset:
void setup() { 
// initialize the digital pin as an output.
pinMode(led, OUTPUT); 
pinMode(led2, OUTPUT); 
Serial.begin(9600);

}

// the loop routine runs over and over again forever:
void loop() {
sensorValue = analogRead(sensorPin);

/*
if ( timer - previousTimer >= 20 ) {
ledState = !ledState;
previousTimer = timer;
Serial.println(" ");
Serial.println("********* CHANGE STATE!!! ***********");
Serial.println(" ");
}
*/


if ( sensorValue <= 400 ) {
ledState = HIGH;
} else {
ledState = LOW;
}

digitalWrite(led, ledState); // turn the LED on (HIGH is the voltage level)
analogWrite(led2, fade);
fade++;

// Serial.print("Blink # ");

timer++; 
Serial.print("timer= ");
Serial.print(timer);
Serial.print("\t previousTimer= ") ; 
Serial.print(previousTimer);
Serial.print("\t fade= ");
Serial.println(fade);
}