import Adafruit_DHT

class Dht22Sensor:
    def __init__(self, pin):
        self.sensor = Adafruit_DHT.AM2302
        self.pin = pin
        self.last_read = None

    def read(self):
        humidity, temperature = Adafruit_DHT.read_retry(self.sensor, self.pin)
        if humidity is not None and temperature is not None:
            self.last_read = {'temperature': temperature, 'humidity': humidity}
            return self.last_read
        else:
            return None
    
    def get_last_read(self):
        if self.last_read is None:
            self.read()
        return self.last_read