MMM-DHT22 Humidity and Temperature Module

Bangee

Here is my MMM-DHT22 Module.
Temperature and Humidity monitoring Module for MagicMirror2 that works for DHT22 and AM2302 sensors.
https://github.com/Bangee44/MMM-DHT22/

It’s analog to @psk’s Module: https://forum.magicmirror.builders/topic/726/mmm-temperature-humidity-module-dht11-dht22-and-am2302-sensors

But I don’t want to run MagicMirror as Root with sudo.

Bangee

MxBln

Does it also work with the DHT-11?

Jopyth

@Bangee Just me being confused: this needs sudo rights, doesn’t it? You just do not want to start the mirror with sudo?

Bangee

@MxBln I did not check this.

@Jopyth yes, it needs a sudo command inside the app.

trividar

Hi guys

I have some problems with this module. I test it with two DHT22 and I have always the same strange thing. Please look my short clip: [Youtube](video: https://youtu.be/gvuq6A13fw8). Sometimes it shows quickly the exact Temp and sometimes strange values but most of the time it shows undefined. I try to made a skipt outside of the MM and in this picture (link) you can see , at the same time my skript shows the right value but in MM its undefined.
Can someone test this module or help me to find the fault? THX a lot for any help!

Bangee

What’s the result when you try this command directli in your terminal:

go to cd MagicMirror/modules/MMM-DHT22/

sudo ./dht_var 2

Replace 2 with your sensor Pin

I’ve tested this on two different Pi’s

trividar

@Bangee ok, now I’m confused ;o)
Bild Text

The first 5 lines I tried during my MM was working but nothing happend, i had to wait 2 minutes and it shows just a new comment line. After i stopped my MM it was working like a charm (last two lines). What I’m doing wrong?..

Bangee

I don’t now atm :-)

it looks like something is blocking the dht_var script when your MM is running

Do you have error in your MM logs?

trividar

I just checkt it and I don’t have any errors …;o(

Bangee

I’ve tried this on an other pi and it works …

can you uncomment line 33 in node_helper.js to check if he tries to write something in to the logs?

	console.log("Log: " + temp + " - " + hum);

trividar

THX @Bangee for your help. Now i got this error:

Error

yawns

Right. Please replace the word temp with arr[1] and hum with arr[0] in line 33 in node_helper.js

trividar

Now my logs looks like this after I changed line 33:

Bild Text

yawns

Okay, so it definitely fails retrieving data from the sensor, but the error handling does not catch this failure.

trividar

I have test it with two dht22. One was mine and one I received from @Bangee who was so kind to test it before sending it and it was working at his home, but when I tried it at my home it wasn’t working. So I have no Idea what can be the failure.

trividar

Hi ,
so I just figure it out, that the motiondetector by alexyak blocking the DHT22 script. If I disable this module my DHT 22 works perfect. Somebody knows what make this problem?

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.