arduino/SoundMix/SoundMix.pde

   1 /*
   2  * Bit-bang sound
   3  * <~~Harvie 2oo8
   4  */
   5
   6 #define sndout 13
   7
   8 char mixer;
   9
  10 void sound(char sndpin, float freq, float duration) { //Play bit-bang sound
  11   if(duration<=0) return; if(freq<=0) { delay(duration); return; }
  12   freq=((1000000/2)/freq); //Convert freq to delay (us)
  13   duration*=1000; //Convert duration to us
  14   pinMode(sndpin, OUTPUT);
  15   for(;duration>0;duration-=2*freq) {
  16     digitalWrite(sndpin, HIGH); delayMicroseconds(freq);
  17     digitalWrite(sndpin, LOW);  delayMicroseconds(freq);
  18   }
  19   pinMode(sndpin, INPUT); //Close pin to avoid noise (optional)
  20 }
  21
  22 void setup() { // run once, when the sketch starts
  23   pinMode(sndout, OUTPUT);
  24   pinMode(sndout-1, INPUT);
  25 }
  26
  27 void loop() { // run over and over again
  28   //delay(10000); return;//Silence! I'll kill you!
  29   //float i=0; while(1) { sound(sndout, sin(i+=0.01)*550, 10); sound(sndout, cos(i)*400, 10); }
  30   digitalWrite(sndout, digitalRead(sndout-1));
  31   /* int octave, duration;
  32   char melody[]="CCDEECCFFAAGGE-CCDEGGEFEDDCC-CCDEECCFFAAGGE-CCDEGGEFEDDC"; octave=1; duration=300; //Bob Marley's Redemption song - intro ;D
  33   play_melody(sndout, melody, octave, duration); */
  34   //delay(2000);
  35 }
  36