//CASTRO, AUBREY A.
//NW-301
//SHWINT - Mid Individual Assignment 1 

//A TRAFFIC LIGHT SIMULATION WITH COUNTDOWN

// LCD I2C library:
#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() {
  // Red LED 
  lcd.setCursor(5, 0);
  lcd.print("STOP!");
  for (int i = 30; i >= 0; i--) {
    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print(i);
    lcd.print(" ");
    digitalWrite(2, HIGH);
    delay(1000);
  }
  digitalWrite(2, LOW);
  lcd.clear();
  
  // Yellow LED 
  lcd.setCursor(0, 0);
  lcd.print("Prepare to go!");
  for (int i = 3; i >= 0; i--) {
    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print(i);
    lcd.print(" ");
    digitalWrite(3, HIGH);
    delay(1000);
  }
  digitalWrite(3, LOW);
  lcd.clear();
  
  // Green LED 
  lcd.setCursor(6, 0);
  lcd.print("GO!");
  for (int i = 60; i >= 0; i--) {
    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print(i);
    lcd.print(" ");
    digitalWrite(4, HIGH);
    delay(1000);
  }
  digitalWrite(4, LOW);
  lcd.clear();
  
  // Flashing Green LED 
  for (int i = 0; i < 5; i++) {
    digitalWrite(4, HIGH);
    delay(500);
    digitalWrite(4, LOW);
    delay(500);
  }
  
  // Yellow LED for Stop
  lcd.setCursor(0, 0);
  lcd.print("Prepare to stop!");
  for (int i = 3; i >= 0; i--) {
    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print(i);
    lcd.print(" ");
    digitalWrite(3, HIGH);
    delay(1000);
  }
  digitalWrite(3, LOW);
  lcd.clear();
}