#include <Wire.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

void lcdSend(byte value, byte mode) {
  Wire.beginTransmission(I2C_ADDR);
  Wire.write(mode);
  Wire.write(value);
  Wire.endTransmission();
}

void lcdCommand(byte command) {
  lcdSend(command, 0x80);
}

void lcdPrint(char* message, byte line, byte column) {
  byte offset = column + (line * LCD_COLUMNS);
  lcdSend(offset, 0x80);

  while (*message) {
    lcdSend(*message, 0x40);
    message++;
  }
}

void setup() {
  Wire.begin();

  // Init
  lcdCommand(0x33);
  lcdCommand(0x32);
  lcdCommand(0x28);  // 4-bit mode, 2 lines, 5x8 font
  lcdCommand(0x0C);  // Display on, cursor off, blink off
  lcdCommand(0x06);  // Increment cursor

  // Print something
  lcdPrint("Hello, world!", 0, 0);
  lcdPrint("Enjoy!", 1, 0);
}

void loop() {
  // Your loop code here
}