That doesn't work. You need to import from another module, and usualy you do this importing in the beginning of the file. If you just want to call the DHT22 class, just call it directly, it's right above there.

Hey, I am using this with my Pico, but I keep getting "sensor error". After some checking I saw that the sum of my first 4 result bytes is always 1 higher than the parity byte (except for very few exceptions). For example: [3, 72, 2, 37, 113] with 3+72+2+37 = 114 ≠ 113
In regard to the consistency of this, I gather that my implementation cannot be so wrong, but still it is not right. Could it be that the pull-up resistor is too small? It has 9.8kΩ, which in my opinion is not too far off.
Btw, without the resistor I have the same issue.

When using new Pico W together with the DHT22 sensor I get a reading the first time I run the code. The second time and all the following I get the ENOMEM error. I need to physically disconnect and reconbnect the usb to be able to get a reading once more.

Code I run:

from DHT22 import DHT22
from machine import Pin

data_pin = Pin(2, Pin.IN, Pin.PULL_UP)
sensor = DHT22(data_pin)
print(sensor.read())

And the output for two runs:

MicroPython v1.19.1 on 2022-07-05; Raspberry Pi Pico W with RP2040

Type "help()" for more information.
>>> %Run -c $EDITOR_CONTENT
(27.2, 59.8)
>>> %Run -c $EDITOR_CONTENT
Traceback (most recent call last):
  File "<stdin>", line 7, in <module>
  File "DHT22.py", line 156, in read
  File "DHT22.py", line 141, in read_array
OSError: [Errno 12] ENOMEM
>>> 

Could you please clarify usage of power pin? I see in the example it is set to 14, but I only have data pin connected to GP15 and nothing for GP14. I'm following this scheme:

(image credit: https://www.tomshardware.com/how-to/raspberry-pi-pico-weather-station)

Hi is there some reason to drop decimal part of temerature for DHT11?

I modified the code to include it, and had parallel DHT11 and DHT22 connected,one next to the other, and then the temperature value was same.