arduino/dtfm/DTFM.pde

   1 /*
   2  * DTFM
   3  * <~~Harvie 2oo8
   4  */
   5
   6 /*
   7 DTMF keypad frequencies (with sound clips)
   8       1209 Hz 1336 Hz 1477 Hz 1633 Hz
   9 697 Hz  1       2       3       A
  10 770 Hz  4       5       6       B
  11 852 Hz  7       8       9       C
  12 941 Hz  *       0       #       D
  13
  14 DTMF event frequencies
  15 Event             Low frequency High frequency
  16 Busy signal             480 Hz  620 Hz
  17 Dial tone               350 Hz  440 Hz
  18 Ringback tone (US)      440 Hz  480 Hz
  19 */
  20
  21 #define dtfmpin 13
  22
  23 void dtfm_tone(char outpin, float low, float high) {
  24   int duration = 300;
  25   char pin;
  26   long pos, startmillis = millis();
  27   while((pos = millis()-startmillis) <= duration) {
  28     pin = false;
  29     if( sin((pos*low)/1000*(2*PI)) > 0) pin = true;
  30     if( sin((pos*high)/1000*(2*PI)) > 0) pin = true;
  31
  32     if(pin) digitalWrite(outpin, HIGH); else digitalWrite(outpin, LOW);
  33   }
  34 }
  35
  36 int dtfm_key(char outpin, char key) {
  37   switch (key) {
  38     case '1': dtfm_tone(outpin, 697, 1209); break;
  39     case '2': dtfm_tone(outpin, 697, 1336); break;
  40     case '3': dtfm_tone(outpin, 697, 1477); break;
  41
  42     case '4': dtfm_tone(outpin, 770, 1209); break;
  43     case '5': dtfm_tone(outpin, 770, 1336); break;
  44     case '6': dtfm_tone(outpin, 770, 1477); break;
  45
  46     case '7': dtfm_tone(outpin, 852, 1209); break;
  47     case '8': dtfm_tone(outpin, 852, 1336); break;
  48     case '9': dtfm_tone(outpin, 852, 1477); break;
  49
  50     case '*': dtfm_tone(outpin, 941, 1209); break;
  51     case '0': dtfm_tone(outpin, 941, 1336); break;
  52     case '#': dtfm_tone(outpin, 941, 1477); break;
  53
  54     default: return 0;
  55   }
  56   return 1;
  57 }
  58
  59 void dtfm_dial(char outpin, char *keys) {
  60   for(char i=0;keys[i]!=0;i++) { dtfm_key(outpin, keys[i]); delay(100); }
  61 }
  62
  63 void setup()                    // run once, when the sketch starts
  64 {
  65   pinMode(dtfmpin, OUTPUT);      // sets the digital pin as output
  66   //dtfm_dial(dtfmpin, "739136794");
  67   dtfm_tone(dtfmpin, 1, 10);
  68 }
  69
  70 void loop()                     // run over and over again
  71 {
  72 delay(10000);
  73 }