# 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
# modules
from machine import I2C, Pin # since I2C communication would be used, I2C class is imported
from time import sleep
# very important
# this module needs to be saved in the Raspberry Pi Pico in order for the LCD I2C to be used
from pico_i2c_lcd import I2cLcd
# creating an I2C object, specifying the data (SDA) and clock (SCL) pins used in the Raspberry Pi Pico
# any SDA and SCL pins in the Raspberry Pi Pico can be used (check documentation for SDA and SCL pins)
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)
# getting I2C address
I2C_ADDR = i2c.scan()[0]
# creating an LCD object using the I2C address and specifying number of rows and columns in the LCD
# LCD number of rows = 2, number of columns = 16
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)
# continuously print and clear "Hello world!" text in the LCD screen while the board has power
while True:
# putstr method allows printing of the text in the LCD screen
# for other methods that can be used, check lcd_api module
lcd.putstr("My USN NO. is-CS22D009")
sleep(5) # "Hello world!" text would be displayed for 5 secs
lcd.clear()
sleep(1) # clear the text for 1 sec then print the text again