Upload the following code on to your Arduino board.
/*
Adafruit Arduino - Lesson 10. Pseudo Thermin
*/
int speakerPin = 12;
int photocellPin = 0;
void setup()
{
}
void loop()
{
int reading = analogRead(photocellPin);
int pitch = 200 + reading / 4;
tone(speakerPin, pitch);
}
The sketch is actually really straightforward. We simply take an analog reading from A0, to measure the light intensity. This value will be in the range of something like 0 to 700.
We add 200 to this raw value, to make 200 Hz the lowest frequency and simply add the reading divided by 4 to this value, to give us a range of around 200Hz to 370Hz.
Page last edited October 17, 2012
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