thanks John

Here’s the SKETCH. NO OTHER REQUIREMENTS except passing a flashlight over the sensor:

——– fwd ————-
/*
Pitch follower

Plays a pitch that changes based on a changing analog input

circuit:
* 8-ohm speaker on digital pin 8 (I just used the piezo onboard)
* photoresistor on analog 0 to 5V ( Photoresister onboard, pin A6)
* 4.7K resistor on analog 0 to ground (didn’t worry about this)

created 21 Jan 2010
modified 31 May 2012
by Tom Igoe, with suggestion from Michael Flynn
MODIFIED 03/02/13 by Peter H. Rosen while experimenting/learning.
//the tone kicks in when serial readout is > 16

This example code is in the public domain.

http://arduino.cc/en/Tutorial/Tone2

*/

void setup() {
// initialize serial communications (for debugging only):
Serial.begin(9600);
}

void loop() {
int ledPin = 10;
// read the sensor:
int sensorReading = analogRead(A6);
// print the sensor reading so you know its range
Serial.println(sensorReading);
// map the analog input range (in this case, 400 – 1000 from the photoresistor)
*/ (Peter Rosen changes marked with ** Modified values to operate in low light without buzzing)
/*
// to the output pitch range (120 – 1500Hz) **Pitch Extended
// change the minimum and maximum input numbers below
// depending on the range your sensor’s giving:
int thisPitch = map(sensorReading, 100, 500,1000, 5000);
pinMode(ledPin, OUTPUT);

// play the pitch:
tone(7, thisPitch,3);
delay(6); // delay in between reads for stability
}

——###————

Anyways I liked the sensitivity and sound made by passing the flashlight, slowly over the sensor to make a very science fiction like sound. Enjoy.

Respectfully, Callahan W. USMC.

** earlier that day I had been thinking about installing a break beam alarm to let me know if my housemate is coming up the stairs; then THWAP!!! ZINGO I go to your class and walk into instant karma: the Lilypad developers board had that one already programmed in!

A Hui Ho
Pedro