/*
     code used in jamuary02 - Bytebeat
     https://youtu.be/8HQUXlStqK8
     schematic at https://imgur.com/SekUTgN
     noizhardware.com
     enjoy :)
*/
#include <avr/io.h>

#define SNDOUT 4 /* pin3 */
#define POT_A 3 /* pin2 */

uint8_t out;
int16_t t = 0;
uint8_t PARAM_A;
uint16_t potA16;

void setup(){
     pinMode(SNDOUT, OUTPUT);
     pinMode(POT_A, INPUT);}

void loop(){
     potA16 = analogRead(POT_A);
     PARAM_A = (int)(potA16>>2); /* ditch bits to go from 10bit to 8bit */

     out = (t%127)*((t-65&t)>>(PARAM_A/14+7));

     digitalWrite(SNDOUT, out);

     t++;}