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

LiquidCrystal_I2C lcd(0x27,16,2);


const int pinDistanta = A0;
const int pinPragSigur = A1;
const int pinRosu = 4;
const int pinVerde = 5;
const int pinBuzzer =6;

unsigned long ultimaComutare = 0;
bool stareBuzzer = false;

void setup() {
  pinMode(pinRosu, OUTPUT);
  pinMode(pinVerde, OUTPUT);
  pinMode(pinBuzzer, OUTPUT);

  lcd.init();
  lcd.backlight();


}

void loop() {
  int valD = analogRead(pinDistanta);
  int valP = analogRead(pinPragSigur);

  int distanta = map(valD,0,1023,10,150);
  int pragSigur = map(valP,0,1023,10,150);
  float procent = distanta * 100.0 / pragSigur;
  lcd.setCursor(0,0);
  lcd.print("Dist: ");
  lcd.print(distanta);
  lcd.print(" cm     ");
  lcd.setCursor(0,1);
  lcd.print("Prag: ");
  lcd.print(pragSigur);
  lcd.print(" cm     ");

  if(procent > 50){
  digitalWrite(pinRosu, LOW);
  digitalWrite(pinVerde, HIGH);
  }
    else if (procent >=25){
      digitalWrite(pinRosu, HIGH);
      digitalWrite(pinVerde, HIGH);

      if(millis() - ultimaComutare >=300){
        stareBuzzer= !stareBuzzer;
        digitalWrite(pinBuzzer, stareBuzzer ? HIGH: LOW);
        if(stareBuzzer == true){
        delay(500);
        noTone(pinBuzzer);
        delay(500);

      
    }
    }


}
   else{
    digitalWrite(pinRosu, HIGH);
    digitalWrite(pinVerde, LOW);
    tone(pinBuzzer, 1000);
    delay(250);
    noTone(pinBuzzer);
    delay(250);

  }
}