Request for Baldr Rain Gauge

[garudaonekh]

Hi,
Please add protocol for Baldr Rain Gauge.
https://www.baldrelectronic.com/products/digital-wireless-indoor-outdoor-thermometer-hygrometer-with-rain-gauge

It's also a Rainpoint product. I think it's similar to RainPoint Soil moisture sensor.

I have collected some cu8 files in my attachment.
BaldrRainGauge_CU8_files.zip
Regards;

[zuckschwerdt]

All files except g003_433.92M_250k.cu8 are empty. Drop the files https://triq.org/pdv/ on to check.

It's PPM 1000/2000. This will get the data:
rtl_433 -X 'n=baldr,m=OOK_PPM,s=1000,l=2000,g=3000,r=5000' g003_433.92M_250k.cu8
as {36}75b000000

Run this live as rtl_433 -X 'n=baldr,m=OOK_PPM,s=1000,l=2000,g=3000,r=5000,bits>=36'
and collect the codes. Write the readings you have (from the head unit) with each code, like this:

{36}75b000000 [10 C 60 % 3mm]

Post a list of annotated codes here.

[garudaonekh]

Here it's
(edit: reformatted)
Each transmission is 13 packet of:

{36}75b000000 [2023-02-23 21:44:39 0mm]
{36}75b8000cf [2023-02-23 21:50:27 5.2mm]
{36}75b80017a [2023-02-23 21:56:15 9.6mm]
{36}75b800224 [2023-02-23 22:02:03 13.9mm]
{36}75b8002a3 [2023-02-23 22:07:51 17.1mm]

[zuckschwerdt]

A shorter list is preferred, edited above. What was temperature and humidity at those times?

[garudaonekh]

It only report rain in mm. There's a separate temperature sensor--captured by your Nexus-TH.

[zuckschwerdt]

Never mind, it does not look like there is any temperature or humidity data in there.
See this BitBench.

Its either 20-bit rain in 1/40 mm or 16-bit rain in 1/2.5 mm steps (scale tips) and some 4-bit checksum.

[zuckschwerdt]

Is there a pairing method or button?

Can you remove the batteries, wait a moment and insert them back? Does it still start with 75b or does that change? We must try to find the sender ID.

Also do you have flat batteries or a variable voltage power supply to simulate near dead batteries? Then we can find the "battery_low" flag.

[garudaonekh]

Is there a pairing method or button?

Can you remove the batteries, wait a moment and insert them back? Does it still start with 75b or does that change? We must try to find the sender ID.

Also do you have flat batteries or a variable voltage power supply to simulate near dead batteries? Then we can find the "battery_low" flag.

I already remove battery several times, it's still 75b.
Synchornization and registration is done at the LCD monitor side.
I have voltage regulator so I can simulate low battery. But I don't see any mention of battery status in its manual or on the LCD panel

[zuckschwerdt]

One interesting flag is the 0/8, e.g. the first code had 75b 0 but other codes then 75b 8 -- any idea what that means or when/why this appears?

[garudaonekh]

I remove battery and I run again. There's no 8. only 75b0000f9. I am trying to find the pattern

[garudaonekh]

{36}75b0001f2 [11.6mm]
{36}75b000245 [13.7mm]

And after remove battery again.

[{36}75b000000 2023-02-23 23:39:35]
[{36}75b8000aa 2023-02-23 23:42:29 3.3mm]
[{36}75b0000fd  2023-02-23 23:45:23 5.4mm]

[zuckschwerdt]

Maybe that is a "did it rain since last transmission" flag? Can you capture the same "mm" multiple times? Does the 8 become 0 then?

[garudaonekh]

Here's an update. I notice b8 still there for several minutes and when I make another click. it goes to b0

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-02-24 11:01:01
codes     : {48}00075b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000, {36}75b000000
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-02-24 11:03:56
codes     : {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c, {36}75b00007c
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-02-24 11:06:50
codes     : {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-02-24 11:24:12
codes     : {65}00000003adc000a98, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153, {36}75b800153

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-02-24 11:27:08
codes     : {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6, {36}75b0001a6

[garudaonekh]

Maybe that is a "did it rain since last transmission" flag? Can you capture the same "mm" multiple times? Does the 8 become 0 then?

No, it will not become 0.

[garudaonekh]

I think it the same as your Nexus Temp/humidity protocol but with different payload. They both connect to the same LCD monitor

[zuckschwerdt]

Yes. Then 75 must be the ID and b0/b8 some flags?

The strange thing is the rain counter:
Its either 20-bit rain in 1/40 mm or 16-bit rain in 1/2.5 mm steps (scale tips) and some 4-bit checksum.
I don't think a bucket tip is 1/40 =0.025 mm rain. A cup of 1/2.5 =0.4 mm sounds more reasonable.

• Can you record codes with just one single bucket tip?
• Can you measure the cup (either size or volume) ?

[garudaonekh]

this is 1 tick: [75b000027 0.9mm]
this is 2 ticks: [75b000050 2.0mm]

[zuckschwerdt]

That is very strange. I would have expected:
75b000027 -> 75b000028 -> 75b000029 ...
or 75b000027 -> 75b00003? -> 75b00004? ...

Why would it be 27 -> 50? Can you test again and for more tips?
With "tip" I mean the bucket in the rain sensor moving once. This is the minimum the sensor can "measure" and should be "1" unit.

[garudaonekh]

Yes, it's the smallest unit.

this is 1 tip: [75b000027 0.9mm]
this is 2 tip: [75b000050 2.0mm]
3 tip: 75b00007a
4 tip: 75b0000a3
5 tip: 75b0000cd
6 tip: 75b0000f7

[garudaonekh]

Maybe that is a "did it rain since last transmission" flag? Can you capture the same "mm" multiple times? Does the 8 become 0 then?

The 8 appears when there're quick multiple click tips, sometimes 3 sometimes 4 and sometimes 5 tips to generate the 8.

So it may indicate heavy rain(most likely) or error

[garudaonekh]

I think I get a pattern which may be correct, but it increment double every 3-4 tips maybe it's not 1.25mm per tip:
This steps are repeatable but a bit different value at the end. For example: 75b0000a3-75b0000a6

{36}75b000000 [2023-02-23 21:44:39 0tip]
{36}75b000025 [2023-02-23 21:50:27 1tip]
{36}75b000050 [2023-02-23 21:56:15 2tip]
{36}75b00007a [2023-02-23 22:02:03 3tip]
{36}75b0000a6 [2023-02-23 22:07:51 4tip]
{36}75b0000D1 [2023-02-23 22:07:51 5tip]
{36}75b0000fb [2023-02-23 22:07:51 6tip]
{36}75b000125 [2023-02-23 22:07:51 7tip]
{36}75b00014e [2023-02-23 22:07:51 8tip]
{36}75b000178 [2023-02-23 22:07:51 9tip]
{36}75b00019f [2023-02-23 22:07:51 10tip]
{36}75b0001c8 [2023-02-23 22:07:51 11tip]
{36}75B0001f2 [2023-02-23 22:07:51 12tip]
{36}75B00021b [2023-02-23 22:07:51 13tip]
{36}75B000245 [2023-02-23 22:07:51 14tip]

[garudaonekh]

I think this one is better suited.
Even the 75b8 also give same data as reading on its LCD.

But I don't know where to get the CRC check

[zuckschwerdt]

Using -2 you are cutting of the last 2 bits, so the mm-factor ist now *10 and the 2 bits could be a parity check. I'll test that.

[zuckschwerdt]

Ohh, I see now. The 20d value is correct. But it's not i mm but in thou -- that's 1/1000 inch:

75b0 0000000 : 0mm = 0 thou
75b8 0000207 : 5.2mm = 205 thou
75b8 0000378 : 9.6mm = 378 thou
75b8 0000548 : 13.9mm = 547 thou
75b8 0000675 : 17.1mm = 673 thou

[garudaonekh]

Great! anything else you need from me?

[zuckschwerdt]

We can implement this now. But it will likely be default-disabled as we can't check anything about the packet (would be too many false positives).

[garudaonekh]

What do you mean by false positives?

[zuckschwerdt]

Many signals can be "seen" as this protocol. This decoder will match and decode too many other signals.

[garudaonekh]

I see. Just the NEXUS Tem/sensor, I see it's decoded by 3 protocols on RTL-SDR.(NExus, Bosch and the other one).

Thanks. Looking forward for testing it in RTL_SDR

[garudaonekh]

Hi,

rtl_433 -R 242

It looks like it can only decode when it's 0mm.

Response:

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-03-04 14:22:28
vdata_make() bad data type (197414298)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-03-04 14:22:56
vdata_make() bad data type (197414298)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-03-04 14:24:22
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-03-04 14:24:42
model     : Baldr-Rain   id        : 75b
Flags     : 0            Rain      : 0.000 in
vdata_make() bad data type (197414298)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2023-03-04 14:26:16

[zuckschwerdt]

Oops, thanks, fixed with 1647d9a

[garudaonekh]

Look correct. The result is look correct. I am waiting for my second rain gauge to verify the id is correctly identified.

The first one: 188.171 in is actually the Temperature Sensor. It is also Baldr. So it's that false positive you mentioned.

`_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time : 2023-03-05 15:46:07
model : Baldr-Rain id : 1c8
Flags : 1 Rain : 188.171 in
[pulse_slicer_ppm] Baldr / RainPoint rain gauge.
codes : {0}, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {36}1c812df0b, {35}1c812df0a, {756}000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
[pulse_slicer_ppm] Baldr / RainPoint rain gauge.
codes : {323}000000000000000000000000000000000000000000000000000000000000000000000000000000000

---

time : 2023-03-05 15:47:12
model : Baldr-Rain id : 75b
Flags : 0 Rain : 0.627 in
[pulse_slicer_ppm] Baldr / RainPoint rain gauge.
codes : {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273, {36}75b000273

---

time : 2023-03-05 15:48:01
model : Baldr-Rain id : 1c8
Flags : 1 Rain : 196.363 in
[pulse_slicer_ppm] Baldr / RainPoint rain gauge.
codes : {0}, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {36}1c812ff0b, {35}1c812ff0a, {756}000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
[pulse_slicer_ppm] Baldr / RainPoint rain gauge.
codes : {323}000000000000000000000000000000000000000000000000000000000000000000000000000000000`

[zuckschwerdt]

Thanks for the feedback.

The first one: 188.171 in is actually the Temperature Sensor. It is also Baldr. So it's that false positive you mentioned.

Yes, I have now default-disabled the Baldr-Rain protocol. You now need -R 242 or a conf file

[garudaonekh]

I just receive another rain gauge, its id is 12b. Thus, I think the id is correct

[zuckschwerdt]

If we have 75b and 12b then the b is likely not part of the ID?

[garudaonekh]

its LCD receiver has rain gauge and temp sensor. Thus b might be used to identified it is a rain gauge. I am buying a few more. I will give more update