MMM-DHT22

[ankonaskiff17]

@Jonae Have you by chance done or looked at any sensors that use I2C?

[BKeyport]

@Jonae Nicely done.

I’ve used MMM-CommandToNotifcation/MMM-ValuesByNotification for mine, with MMM-Temperature prior to that. Nice to have a specific to device module, though. :)

[Jonae]

@ankonaskiff17 said in MMM-DHT22:

@Jonae Have you by chance done or looked at any sensors that use I2C?

No

[Jonae]

@BKeyport said in MMM-DHT22:

@Jonae Nicely done.

I’ve used MMM-CommandToNotifcation/MMM-ValuesByNotification for mine, with MMM-Temperature prior to that. Nice to have a specific to device module, though. :)

Thanks for apreciations.

[Jonae]

@Jonae

Version info:

Version info:

v1.0.0 - Initial release
v1.0.1 - Added option to modify the color of the temperature and humidity icons
              - Added option to modify the header size
v1.0.2 - Fix the error readings from sensor
              - Added option to calibrate the sensor readings
              - Added option to change units: C or F

GitHub Repository

[Jonae]

Version info:

v1.0.3 - added default layout style (‘horizontal’ or ‘vertical’)

GitHub Repository

[JohnGalt]

Thanks for your work - it looks good and has the offset feature I need! Like @BKeyport I formerly used MMM-LocalTemperature, but it won’t run on my new MagicMirror build.

For context, I currently do have MMM-DHT-Sensor running on this instance. It runs just fine, but I would prefer the look and feel of yours, as well as needing the offset feature. I have also tried changing from GPIO 4 to GPIO 21 - same results [MMM-DHT-Sensor works on either, MMM-DHT22 works on neither].

My issue with MMM-DHT22 is understanding whether one can get it to run on a Raspberry Pi 4? I have been unable to do so, and it appears to be issues with the Adafruit_Python_DHT libraries. My research appears to show your module relies on that Adafruit library, and the Adafruit library doesn’t support Raspberry Pi 4.

Am I missing something? If so, what? If not, is there a workaround?

[BKeyport]

@JohnGalt I had no trouble with the Adafruit libraries on Pi4. It should be working just fine - Take a look around https://forums.adafruit.com/ - there might be fixes or something available.

[JohnGalt]

@BKeyport thanks for the response. It looks like my issue is actually with the Linux 12 / bookworm version of Raspbian I installed when rebuilding my MagicMirror, as opposed to the R-Pi 4 hardware.

In reading the Adafruit forums here: https://forums.adafruit.com/viewtopic.php?p=938344&hilit=Adafruit_Python_DHT#p938344 I find the official Adafruit response to someone with the same issues is that “DHT22 really sucks to use on linux” and … “you will be a lot happier just using the DHT20 and friends”, with a reference to an Adafruit web article at https://learn.adafruit.com/modern-replacements-for-dht11-dht22-sensors/overview.

In short, the advice is to just buy all new sensors for your Raspberry Pi installs. The OP pointed out that while he acknowledges the newer sensors may indeed be better, that " I spent a good amount of money buying and building, and for all of that to go away with an update really stinks! :( ".

I agree with him since I have probably five (5) DHT 11/22 sensors working on R-Pis, and while it looks like he found a way to upgrade all pip libraries and get it working again, it also appears to only be a matter of time until another update or upgrade of something breaks the system.

Again thanks for pointing me in the right direction.

[BKeyport]

@JohnGalt I’m betting LadyAda and co are working on a fix all the same. They’re big on keeping old hardware working.