Finished bonus section for playing a sequenced melody

src/sketch.ino

@@ -9,21 +9,125 @@
 
 void setup()
 {
-  // initialize serial comms
-  Serial.begin(9600); 
+    // 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);
+    }
 }
 
+// Class to handle output of a melody on a note by note basis and in full.
+class TunePlayer {
+    private:
+        // Arrays of values relating to the pitch, order and duration (in quavers) of the melody.
+        const int tetrisNotes[8] = {1760, 1975, 2093, 2349, 2637, 2793, 3135, 3520};
+        const int tetrisOrder[38] = {4, 1, 2, 3, 2, 1, 0, 0, 2, 4, 3, 2, 1, 1, 2, 3, 4, 2, 0, 0, 3, 5, 7, 6, 5, 4, 2, 4, 3, 2, 1, 1, 2, 3, 4, 2, 0, 0};
+        const int tetrisDurations[38] = {2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 4, 3, 1, 2, 1, 1, 3, 1, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 3};
+        // Integer to store the current position in the melody.
+        int tunePosition = 0;
+        // Boolean value to store the state of the individual note-playing button.
+        bool buttonPressed = false;
+
+    public:
+        void playTune() {
+            // This was created out of misreading the bonus step... Enjoy!
+            // Declare static arrays holding frequency, note duration and note order data for a tune.
+            // Iterate over arrays, playing notes with durations specified as multiples of quavers at 144bpm
+            for(int i = 0; i < 38; ++i)
+            {
+                tone(13,tetrisNotes[tetrisOrder[i]],tetrisDurations[i]*206);
+                delay(tetrisDurations[i]*206);
+            }
+        }
+
+        void playTuneNote() {
+            // Begin playing a note from the melody if one is not already playing.
+            if(!buttonPressed) {
+                tone(13,tetrisNotes[tetrisOrder[tunePosition]]);
+                // Increment the position ready for the next note to be played
+                incrementPosition();
+                // Set the button state as true so that further calls to the
+                // function from the current press do nothing until it is
+                // released.
+                buttonPressed = true;
+            }
+        }
+
+        void buttonInactive() {
+            // Public method for declaring the button as released.
+            buttonPressed = false;
+        }
+
+        int incrementPosition() {
+            // Mthod for incrementing the tune position without exceeding the
+            // number of positions available.
+            ++tunePosition;
+            if(tunePosition > 37) {
+                tunePosition = 0;
+            }
+            return tunePosition;
+        }
+};
+
+// 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;
+
+
+// Create a global player object instance.
+TunePlayer player = TunePlayer();
+
 void loop()
 {
-  // read A0
-  int val1 = analogRead(0);
-  // read A1
-  int val2 = analogRead(1);
-  // print to serial
-  Serial.print(val1);
-  Serial.print(" ");
-  Serial.print(val2);
-  Serial.print("\n");
-  // wait 
-  delay(50);
+    // Declare a bool for testing if button is active.
+    bool active = false;
+
+    // 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;
+    }
+    // Switch allows for easy overwriting of buton's default functionality.
+    switch(j) {
+        case 7:
+            // Special case to play tune with button 7.
+            player.playTune();
+            break;
+        case 6:
+            // Special case to play tune on a per note basis with button 6.
+            player.playTuneNote();
+            break;
+        case 8:
+            // If no note is active then silence instrument.
+            noTone(13);
+            // Set tune button as inactive ready for next note.
+            player.buttonInactive();
+            break;
+        default:
+            // default action to output a tone for a button
+            // Get integer value from FSR in range 0-1023
+            int sensorVal = analogRead(0);
+
+            // Calculate the offset 5% of the bend.
+            int bend = round(pitch / 100.0 * 5.0);
+
+            // Map values from the FSR to the pitch -5% to the pitch +5%
+            pitch = map(sensorVal, 0, 1023, pitch-bend, pitch+bend);
+
+            // Generate tone based on pitch +/- bend.
+            tone(13,pitch);
+            player.buttonInactive();
+            break;
+    }
 }