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