# Project objectives:
#  * Print a "Hello world!" text on the LCD screen to test its functionality
#  * Learn how to use I2C communication between the LCD and Raspberry Pi Pico
#  * Get familiarized with the pico_i2c_lcd and lcd_api modules

# Hardware and connections used:
#  * LCD GND Pin to Raspberry Pi Pico GND
#  * LCD VCC Pin to Raspberry Pi Pico VBUS
#    (Note: VBUS is only to be used as power for the screen.
#     It can't be used as power for the entire circuit if there are other components interfaced.)
#  * LCD SDA Pin to Raspberry Pi Pico GPIO Pin 0
#  * LCD SCL Pin to Raspberry Pi Pico GPIO Pin 1

# Programmer: Adrian Josele G. Quional

from machine import I2C, Pin     # Import I2C and Pin classes
from time import sleep           # Import sleep for delays
from pico_i2c_lcd import I2cLcd  # Import the LCD driver module

# Create an I2C object using SDA on GPIO 4 and SCL on GPIO 5
i2c = I2C(0, sda=Pin(4), scl=Pin(5), freq=400000)

# Scan for the I2C address of the LCD
I2C_ADDR = i2c.scan()[0]

# Create the LCD object (2 rows, 16 columns)
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

# Main loop: display "Hello world!" centered on second row
while True:
    lcd.clear()              # Clear the screen
    lcd.move_to(2, 1)        # Move to column 2, row 1 (second row)
    lcd.putstr("Hello world!")  # Print centered text
    sleep(5)                 # Show message for 5 seconds
    lcd.clear()              # Clear screen
    sleep(1)                 # Wait 1 second before repeating