// CC-by-www.ElectroSmash.com Echo Delay Effect Pedal.
// More info about the project at www.ElectroSmash.com/Time-Manipulator
 
// Pin Definitions: 
#define DELAY1 10
#define DELAY2 9
#define SWA 3
#define SWB 14
#define SWC 2
#define SWD 4 
#define LED1_G 1 
#define LED1_R 0
#define LED2_G 5
#define LED2_R 6
#define ENC_A 16
#define ENC_B 18
#define ENC_GND 17
#define ENC_PUSH 19
#define BYPASS_DETECT 8
#define TAP_DETECT  15

//Time to ms conversion table
 int delay_conv[]={ 230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,
 230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,
 230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,230,
 230,230,230,230,230,230,230,230,230,230,230,
 230,229,228,227,226,224,223,222,221,220,219,218,217,216,214,213,212,211,210,209,208,207,206,205,204,203,202,201,200,198,196,194,192,190,189,188,187,186,184,183,182,181,180,179,178,176,175,174,
 173,171,170,169,168,168,167,166,165,164,163,163,162,161,160,159,158,157,156,155,155,154,153,152,151,150,149,148,148,147,146,145,144,143,143,142,141,140,139,139,138,137,137,136,135,135,134,133,133,132,131,131,130,
 129,129,128,128,127,127,126,126,125,124,124,123,123,122,122,121,121,120,120,119,119,118,118,117,117,116,116,115,115,114,114,113,113,112,112,111,111,110,110,109,109,108,108,108,107,107,106,106,105,105,105,104,104,
 103,103,103,102,102,101,101,100,100,100,99,99,99,98,98,98,97,97,97,96,96,96,95,95,94,94,94,93,93,93,92,92,92,91,91,91,90,90,90,89,89,89,89,88,88,88,88,87,87,87,86,86,86,86,85,85,85,84,84,84,84,83,83,83,83,82,82,
 82,81,81,81,81,80,80,80,80,79,79,79,79,79,78,78,78,78,78,77,77,77,77,76,76,76,76,76,75,75,75,75,75,74,74,74,74,74,73,73,73,73,73,72,72,72,72,71,71,71,71,71,70,70,70,70,70,70,69,69,69,69,69,69,68,68,68,68,68,68,68,
 67,67,67,67,67,67,66,66,66,66,66,66,66,65,65,65,65,65,65,64,64,64,64,64,64,64,63,63,63,63,63,63,62,62,62,62,62,62,62,61,61,61,61,61,61,60,60,60,60,60,60,60,60,59,59,59,59,59,59,59,59,58,58,58,58,58,58,58,58,58,57,
 57,57,57,57,57,57,57,57,56,56,56,56,56,56,56,56,55,55,55,55,55,55,55,55,55,54,54,54,54,54,54,54,54,53,53,53,53,53,53,53,53,53,52,52,52,52,52,52,52,52,52,51,51,51,51,51,51,51,51,50,50,50,50,50,50,50,50,50,50,
 50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50,50};
 
//VARIABLES
unsigned int ENC_counter = 100; 
int ENC_aState;
int ENC_aLastState;  
int ENC_aState_selection=0;
int ENC_aLastState_selection=0;
byte timerRunning=0;
unsigned long startTime;
unsigned long endTime;
unsigned long duration=200;
unsigned long currentMillis,previousMillis = 0; 
 
// the setup function runs once when you press reset or power the board
void setup() 
{
//set the pins //init the values
pinMode(DELAY1, OUTPUT);    analogWrite(DELAY1, 100);
pinMode(DELAY2, OUTPUT);    analogWrite(DELAY2, 100);
pinMode(SWA, OUTPUT);       digitalWrite(SWA, LOW);
pinMode(SWB, OUTPUT);       digitalWrite(SWB, LOW);
pinMode(SWC, OUTPUT);       digitalWrite(SWC, LOW);
pinMode(SWD, OUTPUT);       digitalWrite(SWD, LOW);
pinMode(LED1_G, OUTPUT);    analogWrite(LED1_G, 0);
pinMode(LED1_R, OUTPUT);    analogWrite(LED1_R, 0);
pinMode(LED2_G, OUTPUT);    analogWrite(LED2_G, 0);
pinMode(LED2_R, OUTPUT);    analogWrite(LED2_R, 0);
pinMode(ENC_A, INPUT_PULLUP);
pinMode(ENC_B, INPUT_PULLUP);
pinMode(ENC_GND, OUTPUT);
pinMode(ENC_PUSH, INPUT_PULLUP);
pinMode(BYPASS_DETECT, INPUT_PULLUP);
pinMode(TAP_DETECT, INPUT_PULLUP);
ENC_aLastState = digitalRead(ENC_A); 
void read_encoder(void);
}
 
 
void loop() // the loop function runs over and over again forever
{
//detect if the effect is on or off
while((digitalRead(BYPASS_DETECT) == LOW)) 
  {
  digitalWrite(LED1_R,LOW);digitalWrite(LED2_R,LOW);digitalWrite(LED1_G,LOW);digitalWrite(LED2_G,LOW); 
  }  
 
//set the audio relays for echo (all ON)  
digitalWrite(SWA, HIGH);digitalWrite(SWB, HIGH);digitalWrite(SWC, HIGH);digitalWrite(SWD, HIGH);
 
//detect the TAP footswitch rythm and set the correct delay time
if (timerRunning == 0 && digitalRead(TAP_DETECT) == LOW)
{ // button pressed & timer not running already  
  startTime = millis();
  timerRunning = 1;
  delay(200);//debouncing  
}
if (timerRunning == 1 && digitalRead(TAP_DETECT) == LOW)
{ // timer running, button released
endTime = millis();
timerRunning = 0;
duration = endTime - startTime;
}
 
currentMillis = millis();
if ( currentMillis - previousMillis >= duration) 
{
// save the last time you blinked the LED
previousMillis = currentMillis;
// if the LED is off turn it on and vice-versa:
digitalWrite(LED1_R,!digitalRead(LED1_R));
digitalWrite(LED2_R,!digitalRead(LED2_R));
}   
 
//if the duration of the rythm is too long (over 600ms), the delay time is splitted
if (duration<600)
{       
  analogWrite(DELAY1, delay_conv[duration]);
  analogWrite(DELAY2, delay_conv[duration]);
}
  else if (duration<1200)
  {       
   analogWrite(DELAY1, delay_conv[duration>>1]);
   analogWrite(DELAY2, delay_conv[duration>>1]);
  }
    else if (duration<2400)
    {
    analogWrite(DELAY1, delay_conv[duration>>2]);
    analogWrite(DELAY2, delay_conv[duration>>2]);
    }
      else 
      {
      analogWrite(DELAY1, 50);
      analogWrite(DELAY2, 50);
  }        
 
}