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

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
}

void countdown() {
  lcd.setCursor(11, 1);
  for (int i = 15; i > 0; i--) {
    lcd.print("  "); 
    lcd.setCursor(11, 1);
    if (i < 10) {
      lcd.print("0");
    }
    lcd.print(i);
    lcd.print("sec"); 
    delay(1000);
  }
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print("Traffic light is");
  
  lcd.setCursor(0, 1);
  lcd.print("Red for");
  digitalWrite(4, HIGH);
  countdown();
  digitalWrite(4, LOW);

  lcd.setCursor(0, 0);
  lcd.print("Traffic light is");
  lcd.setCursor(0, 1);
  lcd.print("Yellow for");
  digitalWrite(3, HIGH);
  countdown();
  digitalWrite(3, LOW);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Traffic light is");
  lcd.setCursor(0, 1);
  lcd.print("Green for");
  digitalWrite(2, HIGH);
  countdown();
  digitalWrite(2, LOW);
}