/************************************************************************************************
  *   LAB TEST 2025 - TRAFFIC LIGHTS                                                            *
  *                                                                                             *
  *   Student Name:  Indervir Rai                                                                           *
  *                                                                                             *
  *   Description: You will need to wire and code the following program:                        *
  *   Attach all items (breadboard is optional). When the program runs,                         *
  *   a green, yellow then red light should flash (none at the same time). When                 *
  *   the red light is on, a STOP! message should be displayed on the LCD screen, a SLOW!       * 
  *   message when the yellow light is on and a GO! message when the green light is on.         * 
  *   These messages should flash on and off (a blank screen between messages).                 *
  *   The speed that you cycle through the lights/delays should be controlled by the            *
  *   potentiometer. The delay between lights should range between 200-500 milliseconds.        *
  *   The program must be properly commented, indented and variables must be created            *
  *   using proper naming procedures. You must use PORTB and DDRB commands when setting up and  * 
  *   controlling the LED's. The LiquidCrystal I2C library has been added for you.              *
  *                                                                                             *
  *                               GOOD LUCK!                                                    *
  *                                                                                             *
  ***********************************************************************************************/

#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27 //  defines I2C_ADDR
#define LCD_COLUMNS 16 // defines LCD_COLLUMS               
#define LCD_LINES   2 // defines LCD_LINES

int potPin = A0; // potentiometer conneted to A0
int greenLED = 13; // the green LED is connected to pin 13
int yellowLED = 12; // the yellow LED is connected to pin 12
int redLED = 11; // the red LED is connected to pin 11




LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 columns and 2 rows

void setup() {
  DDRB = B111111; // Numbers 13-8 repersented by 1 for HIGH and 0 for LOW

  lcd.init(); // initialize the lcd
  lcd.backlight(); // turn on backlight
  lcd.setCursor(0,0); // sets the cursor to top left of lcd 
  lcd.print("*LED FADER v1.0*");  
  delay(2000);
 
  lcd.setCursor(0,0); // sets the cursor to top left of lcd board
  lcd.print("                ");
  
  lcd.setCursor(6,0); // move cursor to (6,0) on lcd board

}

void loop() {
  lcd.setCursor(6,0); // move cursor to (6,0) on lcd board
  lcd.print("GO!  ");
  PORTB = B100111; // turn on 13 for green led
  delay(500);

  lcd.print("     ");
  delay(500);

  lcd.setCursor(6,0); // move cursor to (6,0) on lcd board
  lcd.print("SLOW! ");
  PORTB = B010111; // turn on 12 for yellow led
  delay(500);

  lcd.print("     ");
  delay(500);

  lcd.setCursor(6,0); // move cursor to (6,0) on lcd board
  lcd.print("STOP! ");
  PORTB = B001111; // turn on 11 for yellow led
  delay(500);

  lcd.print("     ");
  delay(500);
   

}