[mh] Fwd: One Wire sensors

Steve

I'm currently using 20 DS18B20 1-wire temperature sensors

BUT - I connect them to 3 wemos d1 minis 
(https://www.wemos.cc/en/latest/d1/d1_mini.html) powered by  old usb 
chargers.

The Wemos D1 is flashed with a stock image of Tasmota 
(https://tasmota.github.io/docs/), this can support up to 8 1wire 
sensors out of the box, more if you mess with the code).

You can either read the temps by sending an html request to its web page 
(see attached) , or every 5 minutes it publishes the readings via mqtt 
as a topic like tele/Roof_1_temperatures/SENSOR and a JSON message like;

<snip>

{"time":"2020-12-26t14:59:11","ds18s20-1":{"id":"0008019f913c","temperature":16.9},"ds18s20-2":{"id":"0008019faadb","temperature":15.1},"ds18s20-3":{"id":"000801b89032","temperature":17.0},"ds18s20-4":{"id":"000801f5af58","temperature":19.2},"ds18b20-5":{"id":"0000026b4c3f","temperature":18.1},"ds18b20-6":{"id":"000002e07aee","temperature":13.1},"tempunit":"c"}

</snip>

So using the MH mqtt gateway 
(https://github.com/hollie/misterhouse/wiki/Tasmota) and a bit of 
json-decode you can easily extract the temps to populate your own MH 
objects.

Hope this helps

Giles

On 26/12/2020 14:02, Stephen Switzer wrote:
> Several years ago, I ordered a serial to RJ11 adapter from 
> ibutton(something), called the link 12, and a few temperature sensors 
> that look like the standard TO-92 transistor package. I connected it 
> to MH, added one sensor to the network and tried to see if it worked. 
> I had plans to place sensors all around the house.
>
> However, I hadn't ever seen any response from the serial port and 
> shelved the project. I decided to look at it again yesterday and 
> discovered how it worked... sort of:
>
>
> f=First     \=Snif
> n=Next      |=Thru
> r=Reset     l=Level
> b=Byt(NN+)  ^=57600
> j=Bit(N+)   `=38400
> p=BytW/P    ,=19200
> ~=BitW/P    x=BusLo
> d=Aux+      $=Scan
> z=Aux-      *=List
> &=Aux?      h=Help
> (=Extend
> t=Type      "=Iso
>
>
> 420008003BE45B10
> !,420008003BE45B10
>
> I found that at 9600 baud I can press h to see the help, and *, $ will 
> also return data about the sensor that I have on the network. Wow! I 
> finally have something to work with, but I can't figure out where to 
> get the readings from. Pressing p, j or b all give a 1. One time I saw 
> a B3, but it doesn't seem to be repeatable. It's 179 anyway... my 
> server room rack better not be that temperature!!
>
> So, I continued and looked for some MH code to read the serial port 
> data. I found several examples, but none of them seemed to be for 
> reading the OW data directly from a serial port. All seemed to read a 
> dump from an external program - and all from Windows. I'm running Linux.
>
> So, I looked a owfs: installed it, configured it the best that I could 
> figure out and poked around the /run/owfs filesystem...
>
> root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/latesttemp
> 43.1086root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/latesttemp
> 91.3275root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/latesttemp
> 14.4802root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/latesttemp
> 94.4001root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/latesttemp
> 46.0749root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/latesttemp
> 90.8667root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/temperature
> 36.8015root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/temperature
> 1.73821root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/temperature
> 31.6712root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/temperature
> 65.0987root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/temperature
> 27.7991root@avalanche:~# cat /run/owfs/bus.0/10.67C6697351FF/temperature
>
> Every time I checked values, it was something different. Perhaps this 
> is because I twisted the sensors onto the wires, instead of a more 
> secure connection?
>
> Either way, I'm getting SOMETHING... so I think it's time to ask: how 
> do YOU gather OW data? Is there a module for MH to tread it directly, 
> or should we use something external?
>
> Thank you all!
>
> -- 
> Best regards,
> Steve Switzer
>
> ---
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>
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