//03_Test_LCD_and_LEDs
#include <LiquidCrystal_I2C.h>

#define LED_1_PIN 12
#define LED_2_PIN 13

// Initialize the LiquidCrystal_I2C lib as "lcd" and set the LCD I2C address to 0x27 and set the LCD configuration to 16 x 2.
// In general, the address of a 16x2 I2C LCD is "0x27".
// However, if the address "0x27" doesn't work, you can find out the address with "i2c_scanner". Look here : https://playground.arduino.cc/Main/I2cScanner/
LiquidCrystal_I2C lcd(0x27,16,2);

void setup() {
  // put your setup code here, to run once:

  Serial.begin(115200);
  Serial.println();
  delay(1000);

  pinMode(LED_1_PIN, OUTPUT);
  pinMode(LED_2_PIN, OUTPUT);

  digitalWrite(LED_1_PIN, LOW);
  digitalWrite(LED_2_PIN, HIGH);

  // Initialize lcd.
  lcd.init();
  // Turn on the LED backlight on the LCD.
  lcd.backlight();
  // Clean the LCD display.
  lcd.clear();
}

void loop() {
  // put your main code here, to run repeatedly:

  digitalWrite(LED_1_PIN, !digitalRead(LED_1_PIN));
  digitalWrite(LED_2_PIN, !digitalRead(LED_2_PIN));

  lcd.setCursor(0,0);
  if (digitalRead(LED_1_PIN) == HIGH) lcd.print("LED 1 : ON ");
  if (digitalRead(LED_1_PIN) == LOW)  lcd.print("LED 1 : OFF");
  lcd.setCursor(0,1);
  if (digitalRead(LED_2_PIN) == HIGH) lcd.print("LED 2 : ON ");
  if (digitalRead(LED_2_PIN) == LOW)  lcd.print("LED 2 : OFF");

  delay(2000);
}