#include <LiquidCrystal_I2C.h>


LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {

  lcd.init();
  lcd.backlight();
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
}

void loop() {

  lcd.setCursor(5, 0);
  lcd.print("STOP");
  digitalWrite(2, HIGH);
  delay(7000);
  digitalWrite(2, LOW);
  lcd.clear();

  lcd.setCursor(6, 0);
  lcd.print("GO");
  digitalWrite(4, HIGH);
  delay(7000);
  digitalWrite(4, LOW);
  lcd.clear();

  lcd.setCursor(3, 0);
  lcd.print("Prepare to stop!");
  digitalWrite(3, HIGH);
  delay(3000);
  digitalWrite(3, LOW);
  lcd.clear();
}