1 files changed, 131 insertions, 0 deletions
diff --git a/src/jingle_bells/jingle_bells.pde b/src/jingle_bells/jingle_bells.pde
new file mode 100644
index 0000000..b48613d
--- /dev/null
+++ b/src/jingle_bells/jingle_bells.pde
@@ -0,0 +1,131 @@
+/*
+ * Arduino Jingle Bells.  Reconstructed from code snippets here: 
+ *  http://www.uchobby.com/index.php/2007/11/22/arduino-sound-part-3-playing-a-melody/
+ */
+
+#define LEDPIN 13
+#define OUTPIN 9
+
+#define FREQ_A3 220.00
+#define FREQ_AS3 233.08
+#define FREQ_BF3 233.08
+#define FREQ_B3 246.94
+#define FREQ_C4 261.63 //Middle C
+#define FREQ_CS4 277.18
+#define FREQ_DF4 277.18
+#define FREQ_D4 293.66
+#define FREQ_DS4 311.13
+#define FREQ_E4 329.63
+#define FREQ_F4 349.23
+#define FREQ_G4 349.23
+#define FREQ_A4 440.00
+#define FREQ_B4 493.88
+#define FREQ_C5 523.25
+#define FREQ_D5 587.33
+
+#define WHOLE_NOTE_TIME 700
+
+void Sound(float freq, int durationMS, int outputPin) {
+  int halfPeriod;
+  float period;
+  int durationCycles;
+  //Check for rest, 0 frequency is a rest for durationMS.
+  if(freq==0.0) {
+    //0 frequency so we stay quiet for duration
+    delay (durationMS);
+  }
+  else { //Frequency is not zero so we have work to do
+    // turn on output pin
+    pinMode(outputPin, OUTPUT);
+    //calculate the period or cycle time for the given frequency
+    period=1/freq; //Take the reciprocal to get time in seconds
+    period=period*1.0E6; //to covert seconds to uS.
+    //divide that by 2 to get the 1/2 cycle time. convert to int at the same time
+    halfPeriod = (int)(period/2.0) - 7; // subtract 7 us to make up for digitalWrite overhead
+
+    // calculate cycles for duration.
+    durationCycles = (int)(((float)durationMS*1000.0)/period); // play note for duration ms
+    for (int i=0; i<durationCycles; i++){
+      digitalWrite(outputPin, HIGH);
+      delayMicroseconds(halfPeriod);
+      digitalWrite(outputPin, LOW);
+      delayMicroseconds(halfPeriod - 1); // - 1 to make up for fractional microsecond                                              in digitaWrite overhead
+    }
+    // shut off pin to avoid noise from other operations
+    pinMode(outputPin, INPUT);
+  }
+}
+
+void PlayMusicString(char* music, int outputPin){
+  int noteCount=strlen(music);
+  float freq;
+  int duration;
+
+  for (int i=0;i<noteCount;i+=2) {
+    switch(music[i]){
+      case ' ' :
+        freq=0;
+        break;
+      case 'D' :
+        freq=FREQ_D4;
+        break;
+      case 'e' :
+        freq=FREQ_E4;
+        break;
+      case 'f' :
+        freq=FREQ_F4;
+        break;
+      case 'g' :
+        freq=FREQ_G4;
+        break;
+      case 'a' :
+        freq=FREQ_A4;
+        break;
+      case 'b' :
+        freq=FREQ_B4;
+        break;
+      case 'c' :
+        freq=FREQ_C5;
+        break;
+      case 'd' :
+        freq=FREQ_D5;
+        break;
+    }
+    //Note Timing
+    switch(music[i+1]){
+      case '1' :
+        duration=WHOLE_NOTE_TIME;
+        break;
+      case '2' :
+        duration=WHOLE_NOTE_TIME/2;
+        break;
+      case '4' :
+        duration=WHOLE_NOTE_TIME/4;
+        break;
+      case '8' :
+        duration=WHOLE_NOTE_TIME/8;
+        break;
+    }
+    Sound(freq,duration,outputPin);
+    delay(WHOLE_NOTE_TIME/32);
+  }
+}
+
+
+void setup() {
+}
+void loop() {
+  //Jingle Bells translated from sheet music at
+  char music[] = {
+    "D4"             "D4b4a4g4"    "D2 4D4"    "D4b4a4g4" 
+    "e2 4e4"        "e4c4b4a4"    "f2 4d4"     "d4d4c4a4"
+    "b2g4D4"       "D4b4a4g4"    "D2 4D4"    "D4b4a4g4"
+    "e2 4e4"        "e4c4b4a4"    "d4d4d4d4" "e4d4c4a4"
+    "g2g4 4"        "b4b4b2"       "b4b4b2"    "b4d4g4a8" "b2"
+    "c4c4c4c8"    "c4b4b4b8b8" "b4a4a4b4" "a2d2"
+    "b4b4b2"       "b4b4b2"       "b4d4g4a8" "b2 4"       "c4c4"
+    "c4b4b4b8b8" "d4d4c4a4"    "g2"};
+
+  delay(1000);
+  PlayMusicString(music,OUTPIN);
+}