De-initializing self.pulse_in

[WontedAcorn44]

I am trying to use a raspberry pi 4 to capture and store values taken from a DHT22 sensor and I get these errors whenever I try to connect it in properly:

DHT sensor not found, check wiring
#this is when I connect my DH22 sensor
De-initializing self.pulse_in
De-initializing self.pulse_in
Traceback (most recent call last):
  File "/home/pi/humidity.py", line 26, in <module>
    temperature_c = dhtDevice.temperature
  File "/home/pi/.local/lib/python3.9/site-packages/adafruit_dht.py", line 274, in temperature
    self.measure()
  File "/home/pi/.local/lib/python3.9/site-packages/adafruit_dht.py", line 219, in measure
    pulses = self._get_pulses_pulseio()
  File "/home/pi/.local/lib/python3.9/site-packages/adafruit_dht.py", line 141, in _get_pulses_pulseio
    self.pulse_in.clear()
  File "/home/pi/.local/lib/python3.9/site-packages/adafruit_blinka/microcontroller/bcm283x/pulseio/PulseIn.py", line 150, in clear
    self._mq.send("c", True, type=1)
OSError: [Errno 22] Invalid argument

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pi/humidity.py", line 44, in <module>
    dhtDevice.exit()
  File "/home/pi/.local/lib/python3.9/site-packages/adafruit_dht.py", line 93, in exit
    self.pulse_in.deinit()
  File "/home/pi/.local/lib/python3.9/site-packages/adafruit_blinka/microcontroller/bcm283x/pulseio/PulseIn.py", line 111, in deinit
    procs.remove(self._process)
ValueError: list.remove(x): x not in list

Can anyone make any sense of this?

My code is as follows:

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

import time
import datetime
import board
import adafruit_dht

# Initial the dht device, with data pin connected to:
dhtDevice = adafruit_dht.DHT22(board.D4)

e = datetime.datetime.now()
date = "%s-%s-%s" % (e.day, e.month, e.year)
t = time.localtime()
current_time = time.strftime("%H%M%S", t)
file = open('humidityValues'+ date + '_' + current_time +'.txt', 'w')

# you can pass DHT22 use_pulseio=False if you wouldn't like to use pulseio.
# This may be necessary on a Linux single board computer like the Raspberry Pi,
# but it will not work in CircuitPython.
# dhtDevice = adafruit_dht.DHT22(board.D18)

while True:
    try:
        # Print the values to the serial port
        temperature_c = dhtDevice.temperature
        temperature_f = temperature_c * (9 / 5) + 32
        humidity = dhtDevice.humidity
        t = time.local
        current_time = time.strftime("%H:%M:%S", t)
        temperature_c = dhtDevice.temperature
        temperature_f = temperature_c * (9 / 5) + 32
        humidity = dhtDevice.humidity
        str = "time=" + current_time + "   temp={0:0.1f}ºC   humidity={1:0.1f}%".format(temperature_c, humidity)
        print(str)
        file.write(str + "\n")

    except RuntimeError as error:
        # Errors happen fairly often, DHT's are hard to read, just keep going
        print(error.args[0])
        time.sleep(2.0)
        continue
    except Exception as error:
        dhtDevice.exit()
        #raise error

    time.sleep(2.0)

I tried to remedy the problem with this:

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

import time
import datetime
import board
import adafruit_dht

# Initial the dht device, with data pin connected to:
dhtDevice = adafruit_dht.DHT22(board.D4)

e = datetime.datetime.now()
date = "%s-%s-%s" % (e.day, e.month, e.year)
t = time.localtime()
current_time = time.strftime("%H%M%S", t)
file = open('humidityValues'+ date + '_' + current_time +'.txt', 'w')

# you can pass DHT22 use_pulseio=False if you wouldn't like to use pulseio.
# This may be necessary on a Linux single board computer like the Raspberry Pi,
# but it will not work in CircuitPython.
# dhtDevice = adafruit_dht.DHT22(board.D18, use_pulseio=False)

while True:
    try:
        # Print the values to the serial port
        temperature_c = dhtDevice.temperature
        temperature_f = temperature_c * (9 / 5) + 32
        humidity = dhtDevice.humidity
        t = time.local
        current_time = time.strftime("%H:%M:%S", t)
        temperature_c = dhtDevice.temperature
        temperature_f = temperature_c * (9 / 5) + 32
        humidity = dhtDevice.humidity
        str = "time=" + current_time + "   temp={0:0.1f}ºC   humidity={1:0.1f}%".format(temperature_c, humidity)
        print(str)
        file.write(str + "\n")

    except RuntimeError as error:
        # Errors happen fairly often, DHT's are hard to read, just keep going
        print(error.args[0])
        time.sleep(2.0)
        continue
    except Exception as error:
        dhtDevice.exit()
        #raise error

    time.sleep(2.0)

But, all I get are things like: Checksum did not validate. Try again. A full buffer was not returned. Try again.

NOTICE: I am in no way passing the code above off as my own purely.

[aurorapar]

I am having a similar issue. Only getting checksum/not full buffer errors.

import time

import board
from adafruit_dht import DHT22

dht = DHT22(board.D15, use_pulseio=False)

while True:
        try:
                dht.measure()
                print(f"Temp: {dht.temperature} Humidity: {dht.humidity}")
        except Exception as e:
                print("Failed")
                print(e)
        finally:
                time.sleep(2.5)
                print('-----')

[xgqfrms]

As the error message said DHT sensor not found, check wiring

So, I think it's your code that sets an error GPIO output PIN.

What's the board.D4 PIn? Raspberry Pi GPIO is not that PIN as far as I know.

Try changing your code as below shows @WontedAcorn44

- dhtDevice = adafruit_dht.DHT22(board.D4)

+ # BCM GPIO 18 PIN
+ dhtDevice = adafruit_dht.DHT22(board.18)

https://pinout.xyz/