from machine import Pin, I2C
import time

# Initialize I2C (using GPIO 5 for SCL and GPIO 4 for SDA)
# These are standard I2C pins on many ESP32/ESP8266 boards
i2c = I2C(0, scl=Pin(5), sda=Pin(4))  # Set SCL to GPIO 5, SDA to GPIO 4

# LCD I2C Address (0x27 is most common for 20x4 LCD)
LCD_ADDR = 0x27
LCD_WIDTH = 20
LCD_HEIGHT = 4

# LCD Commands
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80

# Display control flags
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00

# Entry mode flags
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00

# Function to send a command to the LCD
def lcd_send_command(command):
    i2c.writeto(LCD_ADDR, bytes([0x00, command]))  # Send the command byte (0x00 for command mode)

# Function to send data (text) to the LCD
def lcd_send_data(data):
    i2c.writeto(LCD_ADDR, bytes([0x40, data]))  # Send the data byte (0x40 for data mode)

# Initialize the LCD
def lcd_init():
    time.sleep(0.1)
    lcd_send_command(LCD_FUNCTIONSET | 0x08)  # 4-bit mode, 2-line display, 5x8 matrix
    lcd_send_command(LCD_DISPLAYCONTROL | LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF)
    lcd_send_command(LCD_ENTRYMODESET | LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT)
    lcd_send_command(LCD_CLEARDISPLAY)  # Clear display
    time.sleep(0.2)

# Set the cursor to a specific location on the LCD
def lcd_set_cursor(col, row):
    if row == 0:
        lcd_send_command(LCD_SETDDRAMADDR | col)
    elif row == 1:
        lcd_send_command(LCD_SETDDRAMADDR | (col + 0x40))  # Address for second row
    elif row == 2:
        lcd_send_command(LCD_SETDDRAMADDR | (col + 0x14))  # Address for third row
    elif row == 3:
        lcd_send_command(LCD_SETDDRAMADDR | (col + 0x54))  # Address for fourth row

# Write a string of text to the LCD
def lcd_write_string(string):
    for char in string:
        lcd_send_data(ord(char))  # Send the character to the LCD

# Initialize the LCD
lcd_init()

# Display "Hello, World!" on the first line
lcd_set_cursor(0, 0)  # Set cursor to the first row, first column
lcd_write_string("Hello, World!")

# Display your name on the second line
lcd_set_cursor(0, 1)  # Set cursor to the second row, first column
lcd_write_string("Your Name")

# Wait for 5 seconds to keep the text on the screen
time.sleep(5)

# Clear the display after the delay
lcd_send_command(LCD_CLEARDISPLAY)