MMM-DHT22 Humidity and Temperature Module

[Bangee]

that’s very strange!?!
Is this module working with a PIR Sensor or a Webcam?
Im using Paviro’s PIR Sensor to turn on an off my monitor.

[trividar]

With picamera. I installed MM on my other pi (completely new installation) and i got the same problem after i installed the motion detector. So I disabled on my MM the motion detector and it works fine on both pi’s. It’s very strange ;o(

[trividar]

No one an idea?

[Bangee]

I am using a PIR sensor.
So i can’t reproduce it.

[PaulB]

Dear guys,

Ive tried to run this skript,nevertheless it’s showing me ‘undefined’ when I am running it in MM-Mode.
Ive already checked the Pin setup and it should be right. Furthermore Ive checked your advises in the posts above me.

Do you have an idea how to fix this error or even how to get an idea where the error is? :D

Kind regards :)

[Bangee]

can you post a pic of your wiring?

when you run the command sudo ./dht_var direct in your console, what happens?

[schmo90]

hy
i have also the problem that the sensor shows only undefined.
if i run your dht_var it shows nothing…
sudo ./dht_var 2 5 returns after 5 seconds without any message…

found out that it is only not working if i have enabled the PIR-Sensor Modul…

[fabrang]

@MxBln I have the same question. It works, but it shows me way to high temperatures and humidity. How did you do it with a DTC11 ?

[beck0r]

same here, shows loading for a very long time and ‘undefined’ afterwards

the sensor is working, see here:

any idea?

[Dracarys]

Are there any news for this module? I have the exact same thing with this module and the DHT22. Sometimes it shows everything correct and then it shows either “undefined”, nothing or ~ “-3200°C”. So it changes almost everytime it refreshes.
I also use the PIR module like Bangee but it doesnt matter if i have this modules activeted or not …the problem still is there.

sudo ./dht_var 22 5

doesn’t do anything. It just returns with no massage like it does by schmo90.
Hope somebody can help us :)

[ryck]

Hi. I have the same issue, no response in the module or in the command line…

I am also using a PIR sensor, maybe it’s related?

[Johans]

@ Bangee
installed modules as described in read.me file but I get no reading of temp or hum.
sensor is working, tested with AdaFruit example

sudo ./AdafruitDHT.py 2302 27 (Data connected to gpio 27)
I get a perfect temp & hum reading, so i’m shure sensor is working.
i’m using an RPI3 - according to wiring pin, wpi 2 = gpio27 = physical pin 13.
I think wiring is OK.

only clock and this module installed.

[PaulB]

Hey guys :) Hope you are all good.
Finally I have the time to work on this module again :)
I had the same errors like you before and unsuprisingly did not found a solution for it.

Is someone in this thread still active?

[Johans]

@PaulB - glad you have found some time to work on it.
Yes I still have the problem with reading the data in the MM.
Hope you can find the cause. I would like to help you, but i’m not a programmer.
The only thing I could help on is perhaps some beta testing.
Cheers.
Johan

[DocVooDoo]

Hey, i have the same problem.
With “./Adafruit_Python_DHT/examples/AdafruitDHT.py 22 27” comes the Temperatur “Temp=20.1* Humidity=29.3%”
The DHT22 is Pinned on PIN 13 (27) (WiringPi 2). On the Mirror is the Temperatur and the Humidity undefined.
Whats the Problem? I found nothing…

[ryck]

@DocVooDoo Then I don’t know, maybe there is something wrong with the module…

Have you tried mine? https://github.com/ryck/MMM-DHT-Sensor

[DocVooDoo]

@ryck Hi. yes, a minute ago. He says “no data returned”.

[ryck]

@DocVooDoo sometimes the raspberry pi needs some time to pick up the values… try to increase the update time (ie, 30 seconds) and wait for it to update a couple of times…

[DocVooDoo]

@ryck nothing has changed. i have “node serveronly” running, and the log says “Error: failed to read sensor at Error (native)”
but the sensor works…

[ryck]

@DocVooDoo Weird… did you follow all the instructions? ie, install bcm2835, npm install, etc?