Arduino 6：光學特雷明-- 聲音與光學的樂器

Light Theremin
光學特雷明

1.                           // variable to hold sensor value
2. int sensorValue;
3.                           // variable to calibrate low value
4. int sensorLow = 1023;
5.                           // variable to calibrate high value
6. int sensorHigh = 0;
7.                           // LED pin
8. const int ledPin = 13;
9. 
   
10. void setup() {
11.                            // Make the LED pin an output and turn it on
12.   pinMode(ledPin, OUTPUT);
13.   digitalWrite(ledPin, HIGH);
14.                             // calibrate for the first five seconds after program runs
15.   while (millis() < 5000) {
16.                             //keep record of the maximum sensor value
17.     sensorValue = analogRead(A0);
18.     if (sensorValue > sensorHigh) {
19.       sensorHigh = sensorValue;
20.     }
21.                              // record the minimum sensor value
22.     if (sensorValue < sensorLow) {
23.       sensorLow = sensorValue;
24.     }
25.   }
26.                            // turn the LED off, signaling the end of the calibration period
27.   digitalWrite(ledPin, LOW);
28. }
29. 
    
30. void loop() {
31.                            //read the input from A0 and store it in a variable
32.   sensorValue = analogRead(A0);
33. 
    
34.                            // map the sensor values to a wide range of pitches
35.   int pitch = map(sensorValue, sensorLow, sensorHigh, 50, 4000);
36. 
    
37.                            // play the tone for 20 ms on   pin 8
38.   tone(8, pitch, 20);
39.                            // wait for a moment
40.   delay(10);
41. }