# Project objectives:
#   Read temperature and humidity values from the DHT22 sensor
#   Display the sensor readings in the console
#
# 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
#
# Developer: Ts Zulkifli Zaki

# modules
from machine import Pin
from time import sleep
from dht import DHT22

# creating a DHT object
dht = DHT22(Pin(15))

# continuously get sensor readings while the board has power
while True:
    # getting sensor readings
    dht.measure()
    temp = dht.temperature()
    humid = dht.humidity()

    # displaying values to the console if values are available
    if humid is not None and temp is not None:
        print(f"Temperature: {temp}°C   Humidity: {humid}% ")
    else:
        print("Failed to retrieve data from sensor.")
    # delay of 2 secs because DHT22 takes a reading once every 2 secs
    sleep(2)