Comments on: DHT11 Sensor With Raspberry PI and Python

By: peppe8o

peppe8o — Mon, 05 May 2025 07:48:54 +0000

In reply to Neil Stewart. Thank you for your feedback, Neil!

By: Neil Stewart

Neil Stewart — Mon, 05 May 2025 00:10:38 +0000

Thanks,
I got it to work on a Zero and a 3A+.

By: peppe8o

peppe8o — Mon, 27 Jan 2025 14:44:06 +0000

In reply to Marc.

Great, many thanks for your feedback!

Best regards,
Giuseppe

By: Marc

Marc — Mon, 27 Jan 2025 14:19:26 +0000

In reply to peppe8o.

Hello PEPPE,

DHT22 works without modification of the config.txt

Best regards
Marc

By: peppe8o

peppe8o — Mon, 27 Jan 2025 08:14:18 +0000

In reply to Marc. Hi Marc. I can't check as I don't have a DHT22 to test. For sure, you must use the proper dtoverlay parameter for dht22. Please let me know if works

By: Marc

Marc — Sun, 26 Jan 2025 21:39:11 +0000

Works fine, exzellent.
Is this also working with DHT22 ?
Regards!

By: truongkmt

truongkmt — Thu, 06 Oct 2022 15:48:06 +0000

Pi 3B OK, thank you

By: peppe8o

peppe8o — Thu, 29 Sep 2022 16:41:38 +0000

In reply to John Waza. Hi John, your suggestion makes me think that starting the python script with a check at the running processes and killing the concurrent could improve the script's reliability. I'll try it in the following weeks. In the meanwhile, thank you for your feedback!

By: John Waza

John Waza — Mon, 26 Sep 2022 00:47:16 +0000

I avoid the “unable to set line to input”, by getting the GPIO to reset by killing, in my case, the libgpiod_pulsein64 linux process, which was still running after a ctrl-c/break.

By: peppe8o

peppe8o — Sat, 25 Sep 2021 12:57:51 +0000

In reply to alpha kavindu.

OK, this seems an error coming from your DHT sensor not giving back any reading.
Please, firstly check that connections are correctly wired.
If all the wiring is ok, then try changing following code:
temperature_f = temperature_c * (9 / 5) + 32 humidity = dhtDevice.humidity print("Temp: {:.1f} F / {:.1f} C Humidity: {}% ".format(temperature_f, temperature_c, humidity))
with this:
humidity = dhtDevice.humidity if temperature_c is not None and humidity is not None temperature_f = temperature_c * (9 / 5) + 32 print("Temp: {:.1f} F / {:.1f} C Humidity: {}% ".format(temperature_f, temperature_c, humidity)) else print("Reading Error")
Please note that in this comment area I can’t write tabulations, so you need to add tab (or space) before 2nd, 3rd and 5th row.
In case of any problem, please write to me at giuseppe@peppe8o.com