Arnov Sharma
Published © LGPL

Arduino Theremin

Arduino Based Theremin with MOZZI Library and LDR

BeginnerFull instructions provided1 hour4,986
Arduino Theremin

Things used in this project

Hardware components

Arduino Micro
Arduino Micro
×1
LDR, 5 Mohm
LDR, 5 Mohm
×1
Resistor 10k ohm
Resistor 10k ohm
×1
Speaker: 0.25W, 8 ohms
Speaker: 0.25W, 8 ohms
×1
PAM8403
×1
UTSOURCE Electronic Parts
UTSOURCE Electronic Parts
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Schematics

SCH without AMP

SCH with AMP

Code

Theremin COde

C/C++
//#include <ADC.h>  // Teensy 3.0/3.1 uncomment this line and install http://github.com/pedvide/ADC
#include <MozziGuts.h>
#include <Oscil.h> // oscillator template
#include <tables/sin2048_int8.h> // sine table for oscillator
#include <RollingAverage.h>
#include <ControlDelay.h>

#define INPUT_PIN 0 // analog control input

unsigned int echo_cells_1 = 32;
unsigned int echo_cells_2 = 60;
unsigned int echo_cells_3 = 127;

#define CONTROL_RATE 64
ControlDelay <128, int> kDelay; // 2seconds

// oscils to compare bumpy to averaged control input
Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin0(SIN2048_DATA);
Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin1(SIN2048_DATA);
Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin2(SIN2048_DATA);
Oscil <SIN2048_NUM_CELLS, AUDIO_RATE> aSin3(SIN2048_DATA);

// use: RollingAverage <number_type, how_many_to_average> myThing
RollingAverage <int, 32> kAverage; // how_many_to_average has to be power of 2
int averaged;

void setup(){
  kDelay.set(echo_cells_1);
  startMozzi();
}


void updateControl(){
  int bumpy_input = mozziAnalogRead(INPUT_PIN);
  averaged = kAverage.next(bumpy_input);
  aSin0.setFreq(averaged);
  aSin1.setFreq(kDelay.next(averaged));
  aSin2.setFreq(kDelay.read(echo_cells_2));
  aSin3.setFreq(kDelay.read(echo_cells_3));
}


int updateAudio(){
  return 3*((int)aSin0.next()+aSin1.next()+(aSin2.next()>>1)
    +(aSin3.next()>>2)) >>3;
}


void loop(){
  audioHook();
}

Credits

Arnov Sharma

Arnov Sharma

265 projects • 272 followers
Just your average MAKER

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