#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

int p1 = 5, p2 = 2, p3 = 3, p4 = 4, b1 = 0;
int adv = 0, pp = A0, brnt = 0, br = 0;
void setup()
{  
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(p1, OUTPUT);
  pinMode(p2, OUTPUT);
  pinMode(p3, OUTPUT);
  pinMode(p4, INPUT_PULLUP);
  pinMode(pp, INPUT);
}

void loop()
{
    b1 = digitalRead(p4);
  	adv = analogRead(pp);
  	brnt = map(adv, 0,1023, 0,255);
    Serial.print("Ocitana A/D vrijednost: ");
 	  Serial.print(adv);
 	  Serial.print("\tTrajanje intervala: ");
  	Serial.print(brnt);
  	Serial.print("ms\n");
  
  	if(b1 == 1){
      digitalWrite(p1, HIGH);
      br++;
      delay(brnt);
      digitalWrite(p2, HIGH);
      br++;
      digitalWrite(p1, LOW);
      delay(brnt);
      digitalWrite(p2, LOW);
      digitalWrite(p3, HIGH);
      br++;
      delay(brnt);
      digitalWrite(p3, LOW);
    }
  	else {
      digitalWrite(p3, HIGH);
      br++;
      delay(brnt);
      digitalWrite(p3, LOW);
      digitalWrite(p2, HIGH);
      br++;
      delay(brnt);
      digitalWrite(p2, LOW);
      digitalWrite(p1, HIGH);
      br++;
      delay(brnt);
      digitalWrite(p1, LOW);
  	}
      lcd.clear();
      lcd.print("Petrovicki");
      lcd.setCursor(11,0);
      lcd.print(brnt);
      lcd.print("ms");
      lcd.setCursor(0,1);
      lcd.print("Br. palj.: ");
      lcd.print(br);
}