ISeeLight.ino

//
// ISeeLight
//
// Print the value of the light sensor to the Serial Monitor.
// Also, make electronic music ... like a theremin.
// 
// We are using port S2 on the Duinobot board for the light sensor.
//
//  NOTES: 
//      - Ports S0-S5 are analog input pins
//      - S0 is identical to Arduino A0 and so on (S5=A5)
//      - To use these ports as Digital pins add 14
//

#define S2 2      // do not add 14 becuase this is analog not digital

int lightLevel;

// run once, when the sketch starts
void setup() {
  // Setup light sensor ...
  // We actually do not have to setup the light sensor port because
  // the default behaviour of these ports is to receive analog input

  // setup the speaker ... this is our theremin
  pinMode(SPEAKER, OUTPUT); 
  
  // Setup serial communication ... 
  Serial.begin(9600);
}

// run over and over again
void loop() {
  int pitch;
  
  // get the light sensor state
  lightLevel = analogRead(S2);

  // take the raw reading from the light sensor,
  // (a number between 0 and 1023) and turn it into
  // an audible frequency (or pitch) we can hear
  //pitch = 200 + lightLevel/4;
  pitch = 20 + lightLevel/2;
  tone(SPEAKER, pitch);
  
  // Print the state of the sensor to the Serial Monitor
  Serial.print("The light level reads: ");
  Serial.print(lightLevel);
  Serial.print(" (pitch is: ");
  Serial.print(pitch);
  Serial.println(")");
}