Added comments to code

src/sketch.ino

@@ -11,31 +11,41 @@ void setup()
 {
     // Communication with the computer is not needed in this project.
     //Serial.begin(9600); 
+    // Set digital pins as inputs ready to read incoming data from buttons.
     for(int i = 5; i < 13; ++i) {
         pinMode(i, INPUT);
     }
 }
 
+// Define integer frequencies in hertz from A (440hz) chromatically.
 int notes[8] = {440, 466, 493, 523, 554, 587, 622, 659};
+// Define a a global variable for pitch.
 int pitch;
 
 void loop()
 {
+    // Declare a bool for testing if button is active.
     bool active = false;
-    // Read a value from the FSR
 
+    // For each button index, check if button is currently pressed...
     int j = 0;
     for(int i = 5; i < 13; ++i) {
         active = digitalRead(i);
+        // If it is, set the output pitch to the frequency stored in the notes
+        // variable at the index of the button pressed
         if(active) {
             pitch = notes[j];
+            // break out of for loop as further iterations are not neccesary.
             break;
         }
+        // If note isn't active then increment index counter.
         ++j;
     }
+    // If no note is active then silence instrument.
     if(!active) {
         noTone(13);
     }
+    // Otherwise, output a tone.
     else {
         tone(13,pitch,20);
     }