#include <LiquidCrystal.h>
#include <EncButton.h>
const int rs = 12, en = 11, d4 = 2, d5 = 3, d6 = 4, d7 = 5;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

Button BTN1(6);
Button BTN2(10);
unsigned int counter = 1000;
unsigned long pressTmr;
byte timeMultiplier = 0;

void setup() {
  lcd.begin(16, 2);
  lcd.print("TEST");
  Serial.begin(9600);
}

void loop() {
  BTN1.tick();
  BTN2.tick();

  lcd.setCursor(0, 1);
  lcd.print("Pause:");
  lcd.setCursor(6,1);

  counter = constrain(counter,0, 30000);
  if (counter==1000) {lcd.print(counter); lcd.print("   "); }

  if(BTN1.press()) {
    lcd.setCursor(6,1); 
    counter++;
    lcd.print(counter);lcd.print("    ");
  }
  if(BTN2.press() && counter > 0) {
    lcd.setCursor(6,1);
    counter--;
    lcd.print(counter); lcd.print("    ");
  }
  if(BTN1.holding()) { 
    if (millis()-pressTmr>650) {
      pressTmr = millis();
      timeMultiplier++;    //do every 3s
      //Serial.println("reached 3s.."+ String(timeMultiplier));
    }
    btn1Holding(timeMultiplier);
  }
  if(BTN1.release()) timeMultiplier=0;

  if(counter>0 && BTN2.holding()) {
    if (millis()-pressTmr>650) {
      pressTmr = millis();
      timeMultiplier++;    //do every 3s
      //Serial.println("- reached 3s.."+ String(timeMultiplier));
    }
    btn2Holding(timeMultiplier);
  }
  if(BTN2.release()) timeMultiplier=0;  

  delay(20);
}

int btn1Holding(byte multiplier) {
  lcd.setCursor(6,1);
  counter+=multiplier;
  lcd.print(counter); 
  lcd.print("    ");
  return counter;
}
  
int btn2Holding(byte multiplier) {
  lcd.setCursor(6,1);
  if(counter>multiplier) counter-=multiplier; 
  else counter = 0;
  lcd.print(counter); 
  Serial.println("- reached 3s.."+ String(multiplier));
  lcd.print("    ");
  return counter;
}