# Project objectives: 
#   Read temperature and humidity values from the DHT22 sensor
#   Display the sensor readings in the console
#   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 connections used:
#   DHT22 VCC Pin to 3.3V
#   DHT22 SDA Pin to GPIO Pin 15
#   10k ohm pull-up resistor from DHT22 SDA Pin to 3.3V
#   DHT22 GND Pin to GND
#   LCD GND Pin to Raspberry Pi Pico GND
#   LCD VCC Pin to Raspberry Pi Pico VBUS 
#   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 Pin, I2C
from time import sleep
from dht import DHT22   # if the sensor is DHT11, import DHT11 instead of DHT22
from pico_i2c_lcd import I2cLcd

# DHT22 sensor setup
dht = DHT22(Pin(15)) 

# LCD setup
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)
I2C_ADDR = i2c.scan()[0]
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

# Continuously read sensor data and display on console, then print "Hello world!" on LCD
while True:
    # Read sensor data
    dht.measure()
    temp = dht.temperature()
    hum = dht.humidity()

    # Display sensor data on console
    print(f"Temperature: {temp}°C   Humidity: {hum}% ")

    # Display temperature and humidity on LCD
    lcd.clear()
    lcd.putstr("Temperature: {}C".format(temp))
    lcd.move_to(0, 1)  # Move cursor to the second line
    lcd.putstr("Humidity: {}%".format(hum))

    sleep(5)  # Display temperature and humidity for 5 seconds
    lcd.clear()
    sleep(1)  # Clear LCD for 1 second before repeating