8000 Add support for HG9901 moisture sensor by zuckschwerdt · Pull Request #3194 · merbanan/rtl_433 · GitHub
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Add support for HG9901 moisture sensor #3194

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Add support for HG9901 moisture sensor #3194

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zuckschwerdt
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See #3189 #3190

Note that this protocol has no checksum and is default disabled, use -R 275

@Tuxyso
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Tuxyso commented Apr 18, 2025 •
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I would be very interested to get support for the HG9901 into the main branch. I also own such sensor which is also sold in Germany under the brand "dr meter", see https://www.amazon.de/Dr-meter-Feuchtigkeitsmesser-Feuchtigkeitsmessger%C3%A4t-Bodenwassermonitor-Gartenarbeit/dp/B0CQL27NZL

The sensors are interesting because they have a very strong signal and are very inexpensive.

What currently avoids to add HG9901 to the main branch?
If there are still technical issued I can provide recorded signals, but as I understood #3190 correctly everything seems to be fine?!

@onlymejosh onlymejosh mentioned this pull request May 9, 2025
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I’ve been trying to get this branch to work whilst comparing it to the code in #3190 there are some slight variations, by the looks of it (my limited understanding) it’s just tidying. However the last in the comments works somewhat, but I can’t get this branch to log out any of the correct values.

@obzerving
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I've tried out this branch on a Raspberry Pi 3B and I've gotten results for moisture and temperature that correlate to the display that comes with the sensors. Obviously, I can't correlate the light level, but the light_lux readings have been rational.

pi@rtlsdr:~ $ rtl_433 -F json -M utc -R 275
rtl_433 version 24.10-59-g1a6c32f7 branch feat-hg9901 at 202502102227 inputs fil
Use "-F log" if you want any messages, warnings, and errors in the console.
Detached kernel driver
Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Allocating 15 zero-copy buffers
{"time" : "2025-05-16 14:00:18", "model" : "HG9901", "id" : 16615, "battery_ok" : 1.000, "temperature_C" : 20, "moisture" : 61, "light_lux" : 5100}

@zuckschwerdt
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Duplicated and continued in #3299.

@zuckschwerdt zuckschwerdt deleted the feat-hg9901 branch June 23, 2025 09:59
@zuckschwerdt zuckschwerdt mentioned this pull request Jun 23, 2025
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@zuckschwerdt @Tuxyso @onlymejosh @obzerving
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