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# Part 1: Display Temperature and Humidity
# Read Temperature and Humidity using DHT22 Sensor and display values on console and LCD Display
# Author: Dinesh Madumal (24007386)
# Version: 1.0
# Last Edit: 16/05/2023

# Import Libraries
from machine import I2C, Pin
import utime
from dht import DHT22
from pico_i2c_lcd import I2cLcd

def main():
    # Creating a DHT object and assign GP0 pin 
    dht = DHT22(Pin(0))

    # Creating a I2C object, specifying the data (SDA) and clock (SCL) pins
    # SDA = GP16 and SCL = GP17
    i2c = I2C(0, sda=Pin(16), scl=Pin(17), freq=400000)

    # Getting I2C addres
    I2C_ADDR = i2c.scan()[0]

    # Creating a LCD object using the I2C address and specifying number of rows and columns in the LCD
    # LCD number of rows = 4, number of columns = 20
    lcd = I2cLcd(i2c, I2C_ADDR, 4, 20)

    # Continuously get DHT22 sensor readings while the board has power
    while True:
        # Getting temperature and humidity readings from DHT22 sensor 
        dht.measure()
        temp = dht.temperature()
        hum = dht.humidity()
        print("**************************************")
        print(temp)
        print(hum)
        print("**************************************")

        # Displaying values to the console
        print("Temperature: {}°C   Humidity: {:.0f}% ".format(temp, hum))

        # Displaying values to the LCD display
        lcd.putstr("Temperature: {}°C  Humidity: {:.0f}% ".format(temp, hum))

        # Wait for 2 seconds before taking the next measurement
        utime.sleep(2)

        # Clear the text in LCD display
        lcd.clear()

if __name__ == "__main__":
    main()