Arduinemin - An Arduino Theremin

1int C = 262;
2int D = 294;
3int E = 330;
4int F = 349;
5int G = 392;
6int A = 440;
7int B = 494;
8int C1 = 523;
9
10int trigPin = 9;
11int echoPin = 11;
12int flatPin = 7;
13int sharpPin = 13;
14int buzzer = 10;
15int potentimoter = A4;
16
17float duration, distance;
18
19void setup() {
20  pinMode(trigPin, OUTPUT);
21  pinMode(echoPin, INPUT);
22  pinMode(flatPin, INPUT);
23  pinMode(sharpPin, INPUT);
24  pinMode(buzzer, OUTPUT);
25  pinMode(potentimoter, INPUT);
26  Serial.begin(9600);
27}
28
29int prevNote = 1;
30
31void loop() {
32  int note = findNote(prevNote);
33  Serial.println(note);
34
35  int freq = getNote(note);
36  //Serial.println(freq);
37
38  int semitone = semiTone(freq);
39  //Serial.println(semitone);
40
41  int range = findRange();
42  //Serial.println(range);
43
44  int octave = convertRange(range, semitone);
45  Serial.println(octave);
46
47  if (note != 0) {
48    tone(buzzer, octave);
49  } else {
50    noTone(buzzer);
51  }
52
53  prevNote = note;
54
55  Serial.println("");
56  delay(100);
57}
58
59int findNote(int prevNote) {
60  digitalWrite(trigPin, LOW);
61  delayMicroseconds(2);
62  digitalWrite(trigPin, HIGH);
63  delayMicroseconds(10);
64  digitalWrite(trigPin, LOW);
65
66  duration = pulseIn(echoPin, HIGH);
67  distance = (duration * (0.0135039) / 2) / 2;
68  Serial.println(distance);
69
70  float low = prevNote - 0.1;
71  float high = prevNote + 0.1;
72
73  int note = 0;
74
75  if (distance >= 50) {
76    distance = 9;
77  }
78
79  if ((distance < high) && ((distance + 1) > low)) {
80    note = prevNote;
81    return note;
82  } else {
83    if ((distance < 8) && (distance > 0)) {
84      note = int(distance) + 1;
85      return note;
86    } else {
87        return 0;
88    }
89  }
90}
91
92int getNote(int num) {
93  int note = 0;
94  if (num == 1) {
95    note = C;
96  } else if (num == 2) {
97    note = D;
98  } else if (num == 3) {
99    note = E;
100  } else if (num == 4) {
101    note = F;
102  } else if (num == 5) {
103    note = G;
104  } else if (num == 6) {
105    note = A;
106  } else if (num == 7) {
107    note = B;
108  } else if (num == 8) {
109    note = C1;
110  }
111  return note;
112}
113
114int semiTone(int note) {
115  if ((digitalRead(sharpPin) == LOW) && (digitalRead(flatPin) == LOW)) {
116    note = note;
117  } else if (digitalRead(sharpPin) == LOW) {
118    note *= 1.06;
119  } else if (digitalRead(flatPin) == LOW) {
120    note *= (1 / 1.06);
121  } else {
122    note = note;
123  }
124  return note;
125}
126
127int findRange() {
128  int ana = analogRead(A4);
129  int range = map(ana, 0, 255, 0, 2);
130  return range;
131}
132
133int convertRange(int range, int freq) {
134  if (range <= 2) {
135    freq /= 2;
136  } else if (range <= 5) {
137    freq = freq;
138  } else if (range <= 8) {
139    freq *= 2;
140  }
141  return freq;
142}