/* Sound Serial (aka Keyboard Serial) * ------------ * * Program to play tones depending on the data coming from the serial port. * * The calculation of the tones is made following the mathematical * operation: * * timeHigh = 1/(2 * toneFrequency) = period / 2 * * where the different tones are described as in the table: * * note frequency period PW (timeHigh) * c 261 Hz 3830 1915 * d 294 Hz 3400 1700 * e 329 Hz 3038 1519 * f 349 Hz 2864 1432 * g 392 Hz 2550 1275 * a 440 Hz 2272 1136 * b 493 Hz 2028 1014 * C 523 Hz 1912 956 * * (cleft) 2005 D. Cuartielles for K3 * * Updated by Tod E. Kurt to use new Serial. commands * and have a longer cycle time. * */ int ledPin = 13; int speakerPin = 7; // note names and their corresponding half-periods byte names[] ={ 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C'}; int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956}; int serByte = -1; int ledState = LOW; int count = 0; void setup() { pinMode(ledPin, OUTPUT); pinMode(speakerPin, OUTPUT); beginSerial(19200); Serial.println("ready"); } void loop() { digitalWrite(speakerPin, LOW); serByte = Serial.read(); if (serByte != -1) { Serial.print(serByte,BYTE); ledState = !ledState; // flip the LED state digitalWrite(ledPin, ledState); // write to LED } for (count=0;count<=8;count++) { // look for the note if (names[count] == serByte) { // ahh, found it for( int i=0; i<50; i++ ) { // play it for 50 cycles digitalWrite(speakerPin, HIGH); delayMicroseconds(tones[count]); digitalWrite(speakerPin, LOW); delayMicroseconds(tones[count]); } } } }