Arnov Sharma
Published © GPL3+

Arduino Atari Punk Synth

A DIY version of Atari Punk Synth with minimal stuff.

BeginnerFull instructions provided24 minutes2,276
Arduino Atari Punk Synth

Things used in this project

Hardware components

Rotary potentiometer (generic)
Rotary potentiometer (generic)
×5
UTSOURCE Electronic Parts
UTSOURCE Electronic Parts
everything above can be found here for a low price
×1
Arduino UNO
Arduino UNO
×1
JLCPCB Customized PCB
JLCPCB Customized PCB
×1
ATmega328
Microchip Technology ATmega328
×1
Capacitor 22 pF
Capacitor 22 pF
×2
16mhz crystal
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)

Story

Read more

Custom parts and enclosures

lid

base body

Sketchfab still processing.

Thingiverse Link

Schematics

sch for pcb

Code

code

C/C++
#include <MozziGuts.h>
#include <Oscil.h> // oscillator 
#include <tables/cos2048_int8.h> // table for Oscils to play
#include <Smooth.h>
#include <AutoMap.h> // maps unpredictable inputs to a range
 
// int freqVal;
 
// desired carrier frequency max and min, for AutoMap
const int MIN_CARRIER_FREQ = 22;
const int MAX_CARRIER_FREQ = 440;

const int MIN = 1;
const int MAX = 10;

const int MIN_2 = 1;
const int MAX_2 = 15;

// desired intensity max and min, for AutoMap, note they're inverted for reverse dynamics
const int MIN_INTENSITY = 700;
const int MAX_INTENSITY = 10;

// desired mod speed max and min, for AutoMap, note they're inverted for reverse dynamics
const int MIN_MOD_SPEED = 10000;
const int MAX_MOD_SPEED = 1;

AutoMap kMapCarrierFreq(0,1023,MIN_CARRIER_FREQ,MAX_CARRIER_FREQ);
AutoMap kMapIntensity(0,1023,MIN_INTENSITY,MAX_INTENSITY);
AutoMap kMapModSpeed(0,1023,MIN_MOD_SPEED,MAX_MOD_SPEED);
AutoMap mapThis(0,1023,MIN,MAX);
AutoMap mapThisToo(0,1023,MIN_2,MAX_2);

const int KNOB_PIN = 0; // set the input for the knob to analog pin 0
const int LDR1_PIN=1; // set the analog input for fm_intensity to pin 1
const int LDR2_PIN=2; // set the analog input for mod rate to pin 2
const int LDR3_PIN=4;
const int LDR4_PIN=3;

Oscil<COS2048_NUM_CELLS, AUDIO_RATE> aCarrier(COS2048_DATA);
Oscil<COS2048_NUM_CELLS, AUDIO_RATE> aModulator(COS2048_DATA);
Oscil<COS2048_NUM_CELLS, CONTROL_RATE> kIntensityMod(COS2048_DATA);

int mod_ratio = 5; // brightness (harmonics)
long fm_intensity; // carries control info from updateControl to updateAudio

// smoothing for intensity to remove clicks on transitions
float smoothness = 0.95f;
Smooth <long> aSmoothIntensity(smoothness);


void setup(){
//  Serial.begin(115200); // set up the Serial output so we can look at the light level
  startMozzi(); // :))
}


void updateControl(){
  
//  freqVal = map(LDR3_PIN, 0, 1023, 1, 100);
  
   int freqVal = mozziAnalogRead(LDR3_PIN); // value is 0-1023
   int FRQ = mapThis(freqVal);
   
   int knob2 = mozziAnalogRead(LDR4_PIN); // value is 0-1023
   int knob2Val = mapThis(knob2);
  
  // read the knob
  int knob_value = mozziAnalogRead(KNOB_PIN); // value is 0-1023
  
  // map the knob to carrier frequency
  int carrier_freq = kMapCarrierFreq(knob_value);
  
  //calculate the modulation frequency to stay in ratio
  int mod_freq = carrier_freq * mod_ratio * FRQ;
  
  // set the FM oscillator frequencies
  aCarrier.setFreq(carrier_freq); 
  aModulator.setFreq(mod_freq);
  
  // read the light dependent resistor on the width Analog input pin
  int LDR1_value= mozziAnalogRead(LDR1_PIN); // value is 0-1023
  // print the value to the Serial monitor for debugging
  //Serial.print("LDR1 = "); 
 // Serial.print(LDR1_value);
 // Serial.print("\t"); // prints a tab

  int LDR1_calibrated = kMapIntensity(LDR1_value);
 // Serial.print("LDR1_calibrated = ");
 // Serial.print(LDR1_calibrated);
//  Serial.print("\t"); // prints a tab
  
 // calculate the fm_intensity
  fm_intensity = ((long)LDR1_calibrated * knob2Val * (kIntensityMod.next()+128))>>8; // shift back to range after 8 bit multiply
//  Serial.print("fm_intensity = ");
 // Serial.print(fm_intensity);
//  Serial.print("\t"); // prints a tab
  
  // read the light dependent resistor on the speed Analog input pin
  int LDR2_value= mozziAnalogRead(LDR2_PIN); // value is 0-1023
//  Serial.print("LDR2 = "); 
//  Serial.print(LDR2_value);
//  Serial.print("\t"); // prints a tab
  
  // use a float here for low frequencies
  float mod_speed = (float)kMapModSpeed(LDR2_value)/1000;
  //Serial.print("   mod_speed = ");
 // Serial.print(mod_speed);
  kIntensityMod.setFreq(mod_speed);
  
 // Serial.println(); // finally, print a carraige return for the next line of debugging info
}


int updateAudio(){
  long modulation = aSmoothIntensity.next(fm_intensity) * aModulator.next();
  return aCarrier.phMod(modulation);
}


void loop(){
  audioHook();
}

Credits

Arnov Sharma

Arnov Sharma

91 projects • 141 followers
Just your average MAKER

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