mirror of https://github.com/noisymime/Arduino.git
65 lines
1.4 KiB
C++
65 lines
1.4 KiB
C++
/*
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Arduino Starter Kit example
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Project 6 - Light Theremin
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This sketch is written to accompany Project 6 in the
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Arduino Starter Kit
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Parts required:
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photoresistor
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10 kilohm resistor
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piezo
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Created 13 September 2012
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by Scott Fitzgerald
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http://arduino.cc/starterKit
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This example code is part of the public domain
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*/
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// variable to hold sensor value
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int sensorValue;
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// variable to calibrate low value
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int sensorLow = 1023;
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// variable to calibrate high value
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int sensorHigh = 0;
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// LED pin
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const int ledPin = 13;
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void setup() {
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// Make the LED pin an output and turn it on
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pinMode(ledPin, OUTPUT);
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digitalWrite(ledPin, HIGH);
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// calibrate for the first five seconds after program runs
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while (millis() < 5000) {
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// record the maximum sensor value
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sensorValue = analogRead(A0);
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if (sensorValue > sensorHigh) {
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sensorHigh = sensorValue;
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}
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// record the minimum sensor value
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if (sensorValue < sensorLow) {
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sensorLow = sensorValue;
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}
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}
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// turn the LED off, signaling the end of the calibration period
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digitalWrite(ledPin, LOW);
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}
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void loop() {
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//read the input from A0 and store it in a variable
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sensorValue = analogRead(A0);
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// map the sensor values to a wide range of pitches
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int pitch = map(sensorValue, sensorLow, sensorHigh, 50, 4000);
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// play the tone for 20 ms on pin 8
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tone(8, pitch, 20);
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// wait for a moment
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delay(10);
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}
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