import machine
import dht
import time

last_temp_value=0
wait_time=2
delta=10


sensor = None

def setup():
    global sensor
    dht_pin= machine.Pin(2)
    sensor=dht.DHT22(dht_pin)

def get_temperature():
    sensor.measure()
    temperature=sensor.temperature()
    print("Temperature value:",temperature,"°C")
    return temperature

def get_humidity():
    sensor.measure()
    humidity=sensor.humidity()
    print("Humidity value:",humidity,"%")


def get_delta(last_value,current_value):
    current_Delta=0
    if(last_temp_value!=0):
        current_Delta=(abs(temperature-last_temp_value)/last_temp_value)*100
    else:
        current_Delta=delta
    return abs(current_Delta)


setup()

while True:
    try:
        temperature=get_temperature()
        humidity=get_humidity()
        if get_delta(last_temp_value,temperature) >= delta:
            print("significant temperature changes detected:",temperature)
            print("Humidity:",humidity)
            last_temp_value=temperature
    except Exception as error:
        print("Failed to read the sensor",error)
    
    time.sleep(2)