#include <Wire.h>
#include <hd44780.h>                        // main hd44780 header
#include <hd44780ioClass/hd44780_I2Cexp.h>  // i2c expander i/o class header

hd44780_I2Cexp lcd;  // declare lcd object: auto locate & auto config expander chip
// LCD geometry
const int LCD_COLS = 20;
const int LCD_ROWS = 4;
/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
*/

// the setup function runs once when you press reset or power the board
void setup() {
  int status;

  // initialize LCD with number of columns and rows:
  // hd44780 returns a status from begin() that can be used
  // to determine if initalization failed.
  // the actual status codes are defined in <hd44780.h>
  // See the values RV_XXXX
  //
  // looking at the return status from begin() is optional
  // it is being done here to provide feedback should there be an issue
  //
  // note:
  //	begin() will automatically turn on the backlight
  //
  status = lcd.begin(LCD_COLS, LCD_ROWS);
  if (status)  // non zero status means it was unsuccesful
  {
    // hd44780 has a fatalError() routine that blinks an led if possible
    // begin() failed so blink error code using the onboard LED if possible
    hd44780::fatalError(status);  // does not return
  }

  // initalization was successful, the backlight should be on now

  // Print a message to the LCD
  lcd.print("Hello, World!");
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  lcd.clear();
  lcd.print("Yellow");
  digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);
  digitalWrite(LED_BUILTIN, LOW);  // turn the LED off by making the voltage LOW
  delay(500);
  lcd.clear();
  lcd.print("Green");        // wait for half a second
  digitalWrite(12, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);             // wait for a second
  digitalWrite(12, LOW);   // turn the LED off by making the voltage LOW
  delay(500);              // wait for half a second
  lcd.clear();
  lcd.print("Blue");
  digitalWrite(11, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);             // wait for a second
  digitalWrite(11, LOW);   // turn the LED off by making the voltage LOW
  delay(500);              // wait for half a second
  lcd.clear();
  lcd.print("Red");
  digitalWrite(10, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);             // wait for a second
  digitalWrite(10, LOW);   // turn the LED off by making the voltage LOW
  delay(500);              // wait for half a second


}