Hi peoples - I ported code from one of the Loud Objects Noise Toy programs over to Arduino compatibility.
I altered a few values, so the sound/functionality is a bit different from the original - but it still pumps out some agressive stereo chiptunes. You can hear a sample of the original noise toy here - Noise Box on Vimeo
To use it -
connect audio left channel to pin 3 and right to pin 4
connect 2 momentary pushbuttons, one between pin 8 and ground, the other 9 and ground.
(pin 9 alters tempo, pin 8 beat sequence)
The original noise toy code can be found on the loud objects' site, named "stereo.c" -
http://loudobjects.com/kit/
Oh and before i forget, here's the code -
/* Stereo BeatGen v1
- adapted from code written by Loud Objects for the ATTiny85/NOISE TOY projects
loudobjects.com
- adapted/messed with for Arduino by Collin Cunningham
me [at] collinmel.com
assumes pins 3 & 4 connected to left & right audio
momentary switches between 8 & 9 and GND
*/
unsigned long NextRandom = 1;
unsigned long Bass_Start = 300, Bass_End = 600;
unsigned char Last_Val_Left = 1, Last_Val_Right = 1;
unsigned long Bass_Left_Period = Bass_Start, Bass_Right_Period = Bass_Start;
unsigned long Bass_Left_Sample = 1, Bass_Right_Sample = 1;
unsigned char Bass_Left_On = 1, Bass_Right_On = 1;
unsigned char Snare_Left_On = 1, Snare_Right_On = 1;
unsigned char Snare_Left_Sample = 1, Snare_Right_Sample = 1;
unsigned long Tempo_Period = 1200, Tempo_Outer = 1, Tempo_Sample = 1;
unsigned char Trax_Left[] = {
1, 0, 2, 1, 1, 0, 3, 1};
unsigned char Trax_Right[] = {
0, 1, 0, 1, 1, 2, 3, 1};
unsigned char Track_Index = -1;
unsigned long New_Rand = randomGen();
unsigned long NextRandom2 = 1;
unsigned long Snare_Length = 500;
void setup()
{
// SET PINS 3 AND 4 AS OUTPUTS
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
// SET PULL-UP RESISTORS ON PINS 9 AND 8
pinMode(9, INPUT);
pinMode(8, INPUT);
digitalWrite(9, HIGH);
digitalWrite(8, HIGH);
}
void loop(){
NextRandom2 = NextRandom2 + 9;
New_Rand = NextRandom2;
// UPDATE SAMPLES
if (Bass_Left_On)
{
if (!(--Bass_Left_Sample))
{
if ((Bass_Left_Period += 11) > Bass_End)
{
Bass_Left_On = 0;
}
Bass_Left_Sample = Bass_Left_Period;
Last_Val_Left = 1 - Last_Val_Left;
}
}
if (Bass_Right_On)
{
if (!(--Bass_Right_Sample))
{
if ((Bass_Right_Period += 13) > Bass_End)
{
Bass_Right_On = 0;
}
Bass_Right_Sample = Bass_Right_Period;
Last_Val_Right = 1 - Last_Val_Right;
}
}
if (Snare_Left_On)
{
if (!(--Snare_Left_Sample))
{
Snare_Left_Sample = New_Rand / 200;// % 10;
Last_Val_Left = 1 - Last_Val_Left;
}
if (!(--Snare_Length))
{
Snare_Left_On = 0;
}
}
if (Snare_Right_On)
{
if (!(--Snare_Right_Sample))
{
Snare_Right_Sample = New_Rand / 200;// % 10;
Last_Val_Right = 1 - Last_Val_Right;
}
if (!(--Snare_Length))
{
Snare_Right_On = 0;
}
}
// CHECK FOR NEXT BEAT
if (!(--Tempo_Outer))
{
Tempo_Outer = 10;
if (!(--Tempo_Sample))
{
if (++Track_Index == 8)
Track_Index = 0;
Tempo_Sample = Tempo_Period;
Bass_Left_On = (Trax_Left[Track_Index] & 1);
Bass_Right_On = (Trax_Right[Track_Index] & 1);
Snare_Left_On = (Trax_Left[Track_Index] & 2);
Snare_Right_On = (Trax_Right[Track_Index] & 2);
Snare_Length = 5000;
Bass_Left_Period = Bass_Start;
Bass_Left_Sample = 1;
Bass_Right_Period = Bass_Start;
Bass_Right_Sample = 1;
}
}
// OUTPUT
if (Last_Val_Left)
PORTD |= (1 << 3);
else
PORTD &= ~((1 << 3));
if (Last_Val_Right)
PORTD |= (1 << 4);
else
PORTD &= ~((1 << 4));
// BUTTON INPUT CHECKS
//pin 8 for tempo
if ((digitalRead(8)) == LOW)
{
Tempo_Period = (random(10000,32767)/30 + 1000); // experiment with diff values for better range
}
//pin 9 for beat
if (digitalRead(9) == LOW)
{
unsigned char i;
for (i = 0; i < 8; i++)
{
Trax_Left[i] = randomGen();
Trax_Right[i] = randomGen();
}
}
}
unsigned long randomGen(void) //pseudo random from original sketch
{
NextRandom = NextRandom * 3865 + 123;
return ((NextRandom >> 16) & 32767);
}
experiment with values for additional funtimes
peaces -cc
