Isolating protocol 113 does not include EcoWitt WH40

[imca-potato]

Greetings!

I have been trying to decode with my Ecowitt WH40 sensor together with my Ambient Weather WH31 Temperature and Humidity sensor. I want to save on some computer resources, so I intend to isolate them using -R 113, which I assume will achieve the "saving computer resources" part. However, when I do that, the WH40 is not being decoded. It does get decoded if I remove the tag, however I would prefer to have it not decode all other signals (which I assume consumes resources). Can someone help clarify this to me?

Thank you for your help!

[ProfBoc75]

@imca-potato :

When you tried without tag but with -M protocol are both decoded as protocol 113 ? What are your rtl_433 command arguments/options/tags ?

From the cu8 samples at rtl_433_tests/tests/EcoWitt-WH40, both sensors are properly decoded with the -R 113 argument.

Are both sensors on the same frequency range ? Test with -M level to get the frequency, then refine it with -f xxx.xxM

Notice that at 433.92M, the sample rate is by default 250kHz so the frequency range is narrower than at 868M/915M with a sample rate at 1000kHz. The reason why you may need to adjust the frequency if you're working around 433.92M, could be -f 433.6M or -f 434.2M for example or keep default frequency but increase the sample rate -s 1024k but this could have a computer performance impact.

[zuckschwerdt]

The biggest resource savings are not to decode FSK frames (by only selecting OOK protocols). The WH40 uses FSK so you can't do that. But you can use -Y squelch to skip decoding all "quiet" frames. As mentioned use -M level and -M noise -Y autolevel to watch signal levels.

[imca-potato]

Greetings!

When you tried without tag but with -M protocol are both decoded as protocol 113 ?

I have tried decoding with the -M protocol tag and indeed both WH31E and WH40 are protocol 113.

What are your rtl_433 command arguments/options/tags ?

The entire command was rtl_433 -d "" -f 915M -s 1000k -M level -M protocol -R 113. I did forget to mention I was using the PlutoSDR, hence the -d "".

Are both sensors on the same frequency range ?

Yes, both are at 915 MHz.

But you can use -Y squelch to skip decoding all "quiet" frames.

Thank you for this, I will try it.

So far, I am using the command without the -R 113 tag, yet it does not decode the WH40 all the time. I've tried increasing the gain manually, even up to 60, yet no luck. I have yet to try it with an RTL-SDR, though. I am sure that the transmitter is working, as indicated by its blinking every time it transmits data.

Once again, thank you for the suggestions. I am still having trouble with WH40 but I will update this as soon as something good happens.