what is rain_mm ?

[Benoit Barthelet]

greetings,

I'm trying to build a small app to get the data from my bresser 5-in-1 (https://www.amazon.fr/dp/B075GQX5QY?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1) and plot it (wip at https://gitlab.bartab.fr/oss_public/myrtl433 and kudos for all the amazing examples in the repo) but I have some issues in understanding what rain_mm really means.

my rtl_433.conf is:

device 0
gain 0
frequency 868.3M
hop_interval 600
ppm_error 0
sample_rate 1024k
pulse_detect autolevel
pulse_detect squelch
pulse_detect magest
samples_to_read 0
analyze_pulses false
report_meta level
report_meta noise
report_meta stats
report_meta time:utc
report_meta protocol
signal_grabber none
output syslog:db-writer-app:6000
stop_after_successful_events false
protocol 172

I receive this kind of message, looks good:

2025-06-06 07:29:56,144 - db_writer_app - INFO - Received data: {"time":"2025-06-06 07:29:56","protocol":172,"model":"Bresser-6in1","id":809862403,"channel":0,"sensor_type":1,"wind_max_m_s":2.5,"wind_avg_m_s":2.5,"wind_dir_deg":225,"rain_mm":936.0,"startup":1,"flags":1,"mic":"CRC","mod":"FSK","freq1":868.22861,"freq2":868.37011,"rssi":-0.253357,"snr":33.30387,"noise":-33.5572}

except that, as you can see rain_mm is 936.0, and I fail to understand the meaning of the value.

At first I thought it was incorrectly reporting the athmospheric pressure, but looking at the same time on my device it shows 1005h Pa so not that.

I can see on the device the daily/weekly/monthly rain millimeter but I fail to see a 936 on it:

So is it 936 mm of rain ? If yes since when ?

Well if you got some clarification I'd be interested. 

[Christian Z.]

The rain_mm field is a cumulated value since startup/reset or rollover. You can derive a useful value by comparing with historical value of choice, e.g. 1h, 1day, ...

[Benoit Barthelet]

ok that makes sense now, thanks for the clarification.
the reset you're talking about is the physical one on the machine right ?
What is a rollover ?

also not in the original question but is there a way to get the
atmospheric pressure ? I'm happy to provide traces if needed

On Fri, Jun 6, 2025 at 12:16 PM Christian Z. <chri...@zuckschwerdt.org> wrote:
>
> The rain_mm field is a cumulated value since startup/reset or rollover. You can derive a useful value by comparing with historical value of choice, e.g. 1h, 1day, ...
>

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[Christian Z.]

the reset you're talking about is the physical one on the machine right ?

Of the sensor, e.g. changing batteries.

 

What is a rollover ?

When the maximum value is reached. That value differs between devices.

 

atmospheric pressure ?

No, that value is measured at the display unit.

 

[Benoit Barthelet]

thanks a lot for your prompt anwers that clarify very well the last bits I was missing,

and thanks too for the amazing piece of software !