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// play monophon sounds on the tesla coil
//
// receives uint16s from serial which specify the tone length in microseconds (1000000/440 is an "a" etc)
int pin1 = 4;
int pin2 = 5;
unsigned int tonelength = 0;
float high_factor = .2;
void setup () {
pinMode(pin1, OUTPUT);
pinMode(pin2, OUTPUT);
Serial.begin(9600);
}
void loop() {
while ( true ) {
if ( Serial.available() > 1 ) {
tonelength = Serial.read() << 8;
tonelength |= Serial.read();
Serial.print("New tonelength: ");
Serial.println(tonelength);
}
if ( tonelength == 0 )
delayMicroseconds(10);
else
beep(tonelength);
}
}
void beep(long usecs) {
high();
delayMicroseconds(usecs*high_factor);
// delayMicroseconds(usecs*on_percentage/100);
low();
delayMicroseconds(usecs*(1-high_factor));
// delayMicroseconds(usecs*(100-on_percentage)/100);
}
void high() {
digitalWrite(pin1, HIGH);
digitalWrite(pin2, HIGH);
}
void low() {
digitalWrite(pin1, LOW);
digitalWrite(pin2, LOW);
}
long freq (double f) {
// convert frequency to tonelength
return 1000000/f;
}
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