/*
 * Speaker sketch with photoresistor
 */
const int outputPin = 9; // Speaker connected to digital pin 9
const int sensorPin = A0; // connect sensor to analog input 0
const int low = 200;
const int high = 800;
const int minDuration = 1; // 1 ms on, 1 ms off (500 Hz)
const int maxDuration = 10; // 10 ms on, 10 ms off (50 Hz)
void setup()
{
 pinMode(outputPin, OUTPUT); // enable output on the led pin
}
void loop() {
 int sensorReading = analogRead(sensorPin); // read the analog input
 int delayval = map(sensorReading, low, high, minDuration, maxDuration);
 delayval = constrain(delayval, minDuration, maxDuration);
 digitalWrite(outputPin, HIGH); // set the pin on
 delay(delayval); // delay is dependent on light level
 digitalWrite(outputPin, LOW); // set the pin off
 delay(delayval);
}