Last Updated or created 2025-02-17

My proof of concept to build an electronic chanter for less than 4 euros.

It uses a Lolin32 Lite and a buzzer. (No libraries needed)
(Some wires, thumbtacks and a PVC tube.)

Plays accidentals (false fingering)
Vibrato
Has serial console debugging
Need other frequencies? Just edit the source.

CODE

int prevnote = 0;

// Note freq table
int ha = 880;
int hg = 783;
int fs = 739;
int f = 698;
int e = 659;
int d = 587;
int cs = 554;
int c = 523;
int b = 493;
int as = 466;
int la = 440;
int lg = 391;
int mute = 0;

// 8 Bits to note, luckly not 9 fingers :)
// 0 (00000000) = all fingers off = mute
// bottom hand top hand
//     0111 011
//             1
// 01110111 = 119 = E
// 255 (11111111) = all fingers on = lg
// below per 10 all 255 posibilities
// Look at position 175
// custom frequency to get vibrato on D 
// using bottom hand middle finger.

int data[] = { 
mute,hg,ha,fs,ha,hg,ha,e,ha,hg,ha,
f,ha,hg,ha,d,ha,hg,ha,fs,ha,
hg,ha,e,ha,hg,ha,f,ha,hg,ha,
c,ha,hg,ha,f,ha,hg,ha,e,ha,
hg,ha,f,ha,hg,ha,d,ha,hg,ha,
f,ha,hg,ha,e,ha,hg,ha,f,ha,
hg,ha,b,ha,hg,ha,f,ha,hg,ha,
e,ha,hg,ha,f,ha,hg,ha,d,ha,
hg,ha,f,ha,hg,ha,e,ha,hg,ha,
e,ha,hg,ha,c,ha,hg,ha,f,ha,
hg,ha,e,ha,hg,ha,f,ha,hg,ha,
d,ha,hg,ha,fs,ha,hg,ha,e,ha,
hg,ha,f,ha,hg,ha,la,ha,hg,ha,
f,ha,hg,ha,e,ha,hg,ha,f,ha,
hg,ha,d,ha,hg,ha,f,ha,hg,ha,
e,ha,hg,ha,f,ha,hg,ha,cs,ha,
hg,ha,f,ha,hg,ha,e,ha,hg,ha,
f,ha,hg,ha,580,ha,hg,ha,f,ha,
hg,ha,e,ha,hg,ha,f,ha,hg,ha,
as,ha,hg,ha,f,ha,hg,ha,e,ha,
hg,ha,f,ha,hg,ha,d,ha,hg,ha,
f,ha,hg,ha,e,ha,hg,ha,f,ha,
hg,ha,c,ha,hg,ha,fs,ha,hg,ha,
e,ha,hg,ha,f,ha,hg,ha,d,ha,
hg,ha,fs,ha,hg,ha,e,ha,hg,ha,
fs,ha,hg,ha,lg };

void setup() {
  pinMode(14, OUTPUT);

  Serial.begin(115200);
  delay(1000); 
  }

void loop() {
  int t1=touchRead(4);  
  int t2=touchRead(2);
  int t3=touchRead(15);
  int t4=touchRead(13);
  int t5=touchRead(12);
  int t6=touchRead(27);
  int t7=touchRead(33);
  int t8=touchRead(32);
  
int note = 0;

// Debug reading  
//Serial.println(t1);
// My readings are near zero and above 50
// So I chose 30 (adjust when needed)

if ( t1 < 30) {
  bitSet(note, 0);  
} 
if ( t2 < 30) {
  bitSet(note, 1);  
} 
if ( t3 < 30) {
  bitSet(note, 2);  
} 
if ( t4 < 30) {
  bitSet(note, 3);  
} 
if ( t5 < 30) {
  bitSet(note, 4);  
} 
if ( t6 < 30) {
  bitSet(note, 5);  
} 
if ( t7 < 30) {
  bitSet(note, 6);  
} 
if ( t8 < 30) {
  bitSet(note, 7);  
}

//Serial.println(note);
  if (note == 0 && note != prevnote) {
    noTone(14);
    prevnote = 0;
  }

if (note != prevnote) {
  tone(14,data[note]);
  // debug
  //Serial.print("Note number : ");
  //Serial.println(note);
  //Serial.print("Freq : ");
  //Serial.println(data[note]);
  
  prevnote = note;
  }
}