idle hands

Dronesizer pt 2

So I'm like working on my dronesizer, and I'm like not getting so far ahead as I like to, but like, I wanna show it anyways. So I've made a little movie:

Basically it is a resistor ladder digital to analog converter, check out the R2R DAC if you want to build one. I added LED's as well. I've also added 6 potentiometers. Just do this 6 times

It's as easy as that. Now I need to add more sound options and tighten the void loop() function because it's dead slow right now.

//audio out variables
float TEMP= 0.0;
 
#define SINC_LENGTH 32 
 
float sinC[3][SINC_LENGTH] = {
  {//sinus
    0.59754515,0.69134176,0.7777851,0.8535534,0.9157348,0.96193975,0.9903926,1.0,0.9903927,0.9619398,0.9157348,0.8535534,0.77778506,0.69134164,0.597545,0.49999985,0.40245464,0.30865806,0.22221464,0.14644638,0.08426499,0.03806007,0.009607285,0.0,0.009607464,0.038060457,0.08426553,0.14644706,0.22221544,0.30865896,0.4024556,0.5000008,  }
  ,
  {//saw
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,  }
  ,
  {//tri
    0.03125,0.0625,0.09375,0.125,0.15625,0.1875,0.21875,0.25,0.28125,0.3125,0.34375,0.375,0.40625,0.4375,0.46875,0.5,0.53125,0.5625,0.59375,0.625,0.65625,0.6875,0.71875,0.75,0.78125,0.8125,0.84375,0.875,0.90625,0.9375,0.96875,1.0,  }
};
 
int incomingByte = 0;	// for incoming serial datar
 
int pin0val =0;
 
enum waveFormType {
  SIN, SQUARE,TRI,  };
 
/*
float vol1=1.0;
 float vol2=1.0;
 float vol3=1.0;
 float vol4=1.0;*/
 
float globalHz1 =0.001;
float oscCount1=0;
 
float globalHz2 =0.001;
float oscCount2=0;
 
float globalHz3 =0.001;
float oscCount3=0;
 
float LFOHz =0.001;
float lfoCount=0;
 
int type=0;
 
void setup()
{
 
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  Serial.begin(9600);
 
  randomSeed(analogRead(0));
 
  //Timer2 setup  This is the audio rate timer, fires an interrupt at 15625 Hz sampling rate
  TIMSK2 = 1&lt;&lt;&lt;SINC_LENGTH)
    oscCount1=0;
  oscCount2+=globalHz2;
  if(oscCount2&gt;SINC_LENGTH)
    oscCount2=0;
  oscCount3+=globalHz3;
  if(oscCount3&gt;SINC_LENGTH)
    oscCount3=0;
  lfoCount+=LFOHz;
  if(LFOHz&gt;SINC_LENGTH)
    LFOHz=0;
 
}
 
void calculateHz(float in,float detune1, float detune2)
{
 
  globalHz1 = ((440 * pow(2.0,(in-69.0)/12.0))/1562.50);
  globalHz2 = (440 * pow(2.0,(detune1-69.0)/12.0))/1562.50;
  globalHz3 = (440 * pow(2.0,(detune2-69.0)/12.0))/1562.50;
 
  /*
  Serial.print("  ");
   Serial.print(globalHz1*100000, DEC);
   Serial.print("  ");
   Serial.print(globalHz2*100000, DEC);
   Serial.print("  ");
   Serial.print(globalHz3*100000, DEC);
   */
}
 
void loop()
{
 
  LFOHz = (analogRead(3)/(SINC_LENGTH*10.0));
  type=analogRead(5)/51;// 20 modes
  float note = ((analogRead(0)/1024.0)*100.0);
  calculateHz(note,note-(((analogRead(1)/1024.0)*2.0)-1.0),note-(((analogRead(2)/1024.0)*2.0)-1.0));
 
  /*
  Serial.println("vol ");
 
   Serial.print(vol,DEC);
 
   Serial.println(" LFOHz");
   Serial.print(LFOHz,DEC);
 
   Serial.print("analog 1: ");
   Serial.print( analogRead(1),DEC);
 
   Serial.print("___ analog 2: ");
   Serial.print( analogRead(2),DEC);
 
   Serial.print(" type ");
   Serial.print(type);
 
   Serial.print(" Note ");
   Serial.print((int)(note) );
   Serial.println(" ");
 
   */
}

This was written by Johan Larsby. Posted on Wednesday, January 20, 2010, at 9:43 pm. Filed under Uncategorized. Bookmark the permalink. Follow comments here with the RSS feed. Post a comment or leave a trackback.

3 Comments

Johan Larsby wrote:

made some serious code updates, adding them to a comment here until I write a new post!

//audio out variables

#define SINC_LENGTH 32

float sinC[4][SINC_LENGTH] = {
{//sinus
0.59754515,0.69134176,0.7777851,0.8535534,0.9157348,0.96193975,0.9903926,1.0,0.9903927,0.9619398,0.9157348,0.8535534,0.77778506,0.69134164,0.597545,0.49999985,0.40245464,0.30865806,0.22221464,0.14644638,0.08426499,0.03806007,0.009607285,0.0,0.009607464,0.038060457,0.08426553,0.14644706,0.22221544,0.30865896,0.4024556,0.5000008 }
,
{//square
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }
,
{//saw
0.03125,0.0625,0.09375,0.125,0.15625,0.1875,0.21875,0.25,0.28125,0.3125,0.34375,0.375,0.40625,0.4375,0.46875,0.5,0.53125,0.5625,0.59375,0.625,0.65625,0.6875,0.71875,0.75,0.78125,0.8125,0.84375,0.875,0.90625,0.9375,0.96875,1.0 }
,
{//tri
0.0625,0.125,0.1875,0.25,0.3125,0.375,0.4375,0.5,0.5625,0.625,0.6875,0.75,0.8125,0.875,0.9375,1.0,0.9375,0.875,0.8125,0.75,0.6875,0.625,0.5625,0.5,0.4375,0.375,0.3125,0.25,0.1875,0.125,0.0625,0.0 }
};

float note =50;
float TEMP= 0.0;

int oldKnobs[6] ={
0,0,0,0,0,0};
int tempKnobs[6] ={
0,0,0,0,0,0};

enum waveFormType {
SIN, SQUARE,SAW,TRI, };

float globalHz1 =0.001;
float oscCount1=0;

float globalHz2 =0.001;
float oscCount2=0;

float globalHz3 =0.001;
float oscCount3=0;

float LFOHz =0.001;
float lfoCount=0;

int type=0;

void setup()
{

pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);

Serial.begin(9600);
//Timer2 setup This is the audio rate timer, fires an interrupt at 15625 Hz sampling rate
TIMSK2 = 1< OCR2A = 127;
TCCR2A = 2; // CTC mode, counts up to 127 then resets
TCCR2B = 0< sei(); // global interrupt enable

}

// timer 2 is audio interrupt timer
ISR(TIMER2_COMPA_vect)
{
OCR2A = 127;
oscillator();

}

//output to audio
void aWrite(byte i)
{
PORTB = PORTB & B000000;
PORTB = PORTB | i;
}

void oscillator()
{

switch(type)
{
case 0:
{
TEMP = (sinC[SIN][(int)oscCount1] );
TEMP += (sinC[SIN][(int)oscCount2] );
TEMP += (sinC[SIN][(int)oscCount3]);
if(LFOHz!=0.0)
TEMP *= (sinC[SIN][(int)lfoCount]);
break;

}

case 1:
{
TEMP = (sinC[SIN][(int)oscCount1] );
TEMP += (sinC[SIN][(int)oscCount2]);
break;
}

case 2:
{
TEMP = (sinC[SIN][(int)oscCount1] );
TEMP += (sinC[SIN][(int)oscCount2] );
TEMP += (sinC[SIN][(int)oscCount3] );
break;
}

case 3:
{
TEMP = (sinC[TRI][(int)oscCount1] );
TEMP += (sinC[TRI][(int)oscCount2] );
TEMP += (sinC[TRI][(int)oscCount3] );
if(LFOHz!=0.0)
TEMP *= (sinC[SIN][(int)lfoCount] );

break;

}

case 4:
{
TEMP = (sinC[TRI][(int)oscCount1] );
TEMP += (sinC[TRI][(int)oscCount2] );
break;
}

case 5:
{
TEMP = (sinC[SIN][(int)oscCount1] );
if(LFOHz!=0.0)
TEMP *= (sinC[SIN][(int)lfoCount] );

break;
}

case 6:
{
TEMP = (sinC[TRI][(int)oscCount1] );
if(LFOHz!=0.0)
TEMP *= (sinC[TRI][(int)lfoCount] );

break;
}

case 7:
{
TEMP = (sinC[SQUARE][(int)oscCount1] );
if(LFOHz!=0.0)
TEMP *= (sinC[SQUARE][(int)lfoCount] );

break;
}

case 8:
{
TEMP = (sinC[SQUARE][(int)oscCount1] );
TEMP -= (sinC[SQUARE][(int)oscCount2] );
TEMP += (sinC[SIN][(int)oscCount3] );
break;
}

case 9:
{
TEMP = (sinC[SIN][(int)oscCount1] );
TEMP -= (sinC[TRI][(int)oscCount2] );
TEMP += (sinC[SIN][(int)oscCount3] );
break;
}
case 10:
{
TEMP = (sinC[SAW][(int)oscCount1] );
TEMP += (sinC[SAW][(int)oscCount2] );
TEMP += (sinC[SAW][(int)oscCount3] );
break;
}
case 11:
{
TEMP = (sinC[SAW][(int)oscCount1] );
TEMP += (sinC[SAW][(int)oscCount2] );
TEMP -= (sinC[SAW][(int)oscCount3] );
break;
}
case 12:
{
TEMP = (sinC[SAW][(int)oscCount1] );
TEMP += (sinC[SAW][(int)oscCount2] );
TEMP -= (sinC[SAW][(int)oscCount3] );
if(LFOHz!=0.0)
TEMP *= (sinC[SAW][(int)lfoCount] );
break;

}
case 13:
{
TEMP = (sinC[SAW][(int)oscCount1] );
TEMP += (sinC[SAW][(int)oscCount2] );
TEMP -= (sinC[SAW][(int)oscCount3] );
if(LFOHz!=0.0)
TEMP *= (sinC[SAW][(int)lfoCount] );
break;

}

case 14:
{
TEMP = (sinC[TRI][(int)oscCount1] );
TEMP += (sinC[TRI][(int)oscCount2] );
TEMP -= (sinC[TRI][(int)oscCount3] );
if(LFOHz!=0.0)
TEMP *= (sinC[TRI][(int)lfoCount] );
break;

}
default:
{
TEMP = (sinC[SQUARE][(int)oscCount1] );
TEMP += (sinC[SQUARE][(int)oscCount2] );
TEMP += (sinC[SQUARE][(int)oscCount3] );
if(LFOHz!=0.0)
TEMP *= (sinC[SIN][(int)lfoCount] );
break;
}
}

aWrite((byte)((TEMP)*24)); //write to output

oscCount1+=globalHz1;
if(oscCount1>SINC_LENGTH)
oscCount1=0;
oscCount2+=globalHz2;
if(oscCount2>SINC_LENGTH)
oscCount2=0;
oscCount3+=globalHz3;
if(oscCount3>SINC_LENGTH)
oscCount3=0;
/*lfoCount+=LFOHz; //WTF WHERE I THINKING HERE ????
if(LFOHz>SINC_LENGTH)
LFOHz=0;
*/
lfoCount+=LFOHz;
if(lfoCount>SINC_LENGTH)
lfoCount=0;

}

void loop()
{

tempKnobs[0] =analogRead(0);
tempKnobs[1] =analogRead(1);
tempKnobs[2] =analogRead(2);
tempKnobs[3] =analogRead(3);
tempKnobs[4] =analogRead(4);
tempKnobs[5] =analogRead(5);

if(tempKnobs[0]!=oldKnobs[0])
{
//note = ((tempKnobs[0]/1024.0)*100.0);
//globalHz1 = ((440 * pow(2.0,(note-69.0)/12.0))/1562.50);

globalHz1 = ((tempKnobs[0]/1024.0)*1.70);
oldKnobs[0]=tempKnobs[0];

globalHz2 =globalHz1+ (((tempKnobs[1]/1024.0)*.25)-0.125);
globalHz3 =globalHz1+ (((tempKnobs[2]/1024.0)*.25)-0.125);

}
if(tempKnobs[1]!=oldKnobs[1])
{
globalHz2 =globalHz1+ (((tempKnobs[1]/1024.0)*.25)-0.125);
oldKnobs[1]=tempKnobs[1];
}
if(tempKnobs[2]!=oldKnobs[2])
{
globalHz3 =globalHz1+ (((tempKnobs[2]/1024.0)*.25)-0.125);
oldKnobs[2]=tempKnobs[5];
}
if(tempKnobs[3]!=oldKnobs[3])
{
LFOHz=((tempKnobs[3]/1024.0)*0.4);
oldKnobs[3]=tempKnobs[3];

}
if(tempKnobs[4]!=oldKnobs[4])
{
oldKnobs[4]=tempKnobs[4];
}
if(tempKnobs[5]!=oldKnobs[5])
{
type=tempKnobs[5]/51;// 20 modes
oldKnobs[5]=tempKnobs[5];
}

}

Thursday, January 21, 2010 at 10:05 pm | Permalink
PT wrote:

Cool.
This actually inspired me to get my own arduino and coding some simple audio processing.
So I just wanted to say thanks!
//PT

Thursday, May 6, 2010 at 12:41 pm | Permalink
Johan Larsby wrote:

Awesome, great to inspire!

Saturday, May 8, 2010 at 5:46 pm | Permalink

Dronesizer pt 2

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idle hands

Dronesizer pt 2

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