/*
   Project:       LCD Demo
   Description:   Basic connections and setups for
                  parallel and I2c LCD displays.
   Creation date: 7/3/23
   Author:        AnonEngineering

   Added 20x4 6/25/25
*/

// for this demo, include libraries for both types of LCD
#include <LiquidCrystal.h>
#include <LiquidCrystal_I2C.h>

// pin constants for the parallel LCD
const int RS = 12, EN = 11, D4 = 10, D5 = 9, D6 = 8, D7 = 7;

// create a parallel LCD object called "lcd"
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
// create I2C LCD objects with different names and sizes
LiquidCrystal_I2C lcdI2C_16x2(0x27, 16, 2);
LiquidCrystal_I2C lcdI2C_20x4(0x28, 20, 4);  // different address

void setup() {
  // start serial
  Serial.begin(115200);
  // start parallel LCD
  lcd.begin(16, 2); // or (20, 4)
  // start 16x2 I2C LCD
  lcdI2C_16x2.init();
  // turn on the I2C LCD backlight
  lcdI2C_16x2.backlight();
  // start 20x4 I2C LCD
  lcdI2C_20x4.init();
  // turn on the I2C LCD backlight
  lcdI2C_20x4.backlight();

  // start up message on parallel LCD
  lcd.setCursor(2, 0);
  lcd.print("Parallel LCD");
  lcd.setCursor(1, 1);
  lcd.print("Uses 6 uC pins");

  // start up message on 16x2 I2C LCD
  lcdI2C_16x2.setCursor(2, 0);
  lcdI2C_16x2.print("16x2 I2C LCD");
  lcdI2C_16x2.setCursor(1, 1);
  lcdI2C_16x2.print("Uses 2 uC pins");

  // start up message on 20x4 I2C LCD
  lcdI2C_20x4.setCursor(4, 0);
  lcdI2C_20x4.print("20x4 I2C LCD");
  lcdI2C_20x4.setCursor(0, 1);
  lcdI2C_20x4.print("Also uses 2 uC pins,");
  lcdI2C_20x4.setCursor(0, 2);
  lcdI2C_20x4.print("but has 4 rows (0-3)");
  lcdI2C_20x4.setCursor(0, 3);
  lcdI2C_20x4.print("and twenty columns!");

}

void loop() {
  // nothing to loop about...
}