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Add support for Schou 72543 Rain sensor #2686

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merged 19 commits into from
Nov 8, 2023
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36jemini
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Hi,

I have tried to my best ability to write up a decoder for my Schou rain sensor (model: 72543).
The code is not 100% done, but it is at a stage where I would like to request some help.

I have added a pull request with test samples and a longer device description to the rtl_433_tests project,
which has not yet been merged in, so please find it here until then: https://github.com/36jemini/rtl_433_tests/tree/master/tests/Schou

I would like some guidance on,

  • In which file should I "register" the schou_72543_rain.c file?
  • Have I made the right approach to extract the data from the bitbuffer?

Comments, feedback and guidance will be highly appreciated.

@36jemini
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Also, should this be a "draft" Pull request? I'm still new to both git and github

//Assuming option #1

// Full data is 3 rows, two are required for data validation
if(bitbuffer->num_rows < 2){
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add space after keywords (if) and before braces.

uint8_t micSum = b[7]; // Checksum as read
uint8_t calSum = 0; // Checksum as calculated

for(i = 0; i<7; i++){
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use int cal_sum = add_bytes(b, 7);

@zuckschwerdt
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* In which file should I "register" the _schou_72543_rain.c_ file?

include/rtl_433_devices.h then stage or commit and call ./maintainer_update.py. Compile and call ./maintainer_update.py again.

2) schou_72543_rain added to include/rtl_433_devices.h
 Conflicts:
	include/rtl_433_devices.h
 Solution:
        rearrange schou_72543_rain after tmps_nissan
@@ -70,7 +69,7 @@ static int schou_72543_rain_decode(r_device *decoder, bitbuffer_t *bitbuffer)
//Assuming option #1

// Full data is 3 rows, two are required for data validation
if(bitbuffer->num_rows < 2){
if (bitbuffer->num_rows < 2){
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and a space near the end :)

rain_mm = ((b[4] << 8 ) & b[3]) / 10.0f;
temp_F = (((b[6] << 8 ) & b[5]) / 10.0f) - 90;
temp_F = (((b[6] << 8 ) & b[5]) / 10.0f) - 90;
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this would be better written as (((b[6] << 8 ) | b[5]) - 900) * 0.1f;
also above, and note to use | not &

rain_mm = ((b[4] << 8 ) & b[3]) / 10.0f;
temp_F = (((b[6] << 8 ) & b[5]) / 10.0f) - 90;
temp_F = (((b[6] << 8 ) & b[5]) / 10.0f) - 90;

/* clang-format off */
data = data_make(
"model", "", DATA_STRING, "Schou 72543 rain sensor",
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model needs to be just "Schou-72543"

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Thank you @zuckschwerdt for the comments. I seriously appreciate the support!
And I am sorry for the amount of commits. I still did not get the "squish" i think it is called of multiple- to one commit.

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Happy to help. No need to squash. We'll do it on merge anyway.

…ully tested with the rtl_433_tests/tests/Schou/g*.cu8 files
* model name under r_device section and data_make section aligend to schou_72543
…r schou_72543_rain

Updates
 - schou_72543 is now schou_72543_rain everywhere
 - temp_F has become temperature_F to simplify integration with Home Assistant
 - schou_72543_rain has device number 250 after merging changes from the merbanan/rtl_433 master branch
@36jemini
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36jemini commented Nov 7, 2023

Hi @zuckschwerdt,
I have made a few final touches to the code and would consider it done from my side.
I merged in the latest changes from the merbanan/rtl_433 master and have made a final commit.
Can you tell me if i need to do more to get this pull request closed/merged?
BR Jesper

@zuckschwerdt zuckschwerdt merged commit bd452d9 into merbanan:master Nov 8, 2023
5 checks passed
@jsiidorov
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Hi Jesper & co,

This decoder looks similar to MTX rain gauge sold in Finland by Motonet (Product code: 86-01352) and MarQuant Wireless Rain Gauge (Product code: 014369) sold by JULA AB, Sweden.
A couple suggestions to decoder (End of this comment section):

Rain gauge range 0 .. 9999mm. (Display range)
Temperature range -40 .. 70C (-40 ..158F)

When running MTX device: rtl_433.exe -X n=MTX_RAIN,m=OOK_PWM,s=992,l=2696,r=2684,g=0,t=0,y=7088,bits=65,rows=3,repeats=2

Modulation: OOK_PWM
Short pulse: 992
Long pulse: 2696
Reset: 2684
gap: 0
Tolerance: 0
Sync: 7088
Rows: 3
Repeats: 2

Sample Data:

time : 2023-11-25 15:16:22
model : MTX_RAIN count : 2 num_rows : 3
rows :
len : 65 data : 3fcd0ef8ff0a041f0,
len : 65 data : 3fcd0ef8ff0a041f0,
len : 71 data : 3fcd0ef8ff0a041f02
codes : {65}3fcd0ef8ff0a041f0, {65}3fcd0ef8ff0a041f0, {71}3fcd0ef8ff0a041f02

Rain count is starting at power up as described from fff6, it is rotated to 0000 after ffff

  1. Rain count is 0.108 mm / each gauge flip (instead of 0.1mm) according to my tests - can this be changed?
  2. Now decoder is returning temperature in Fahrenheits and rain in mm. Could temperature to be reported in Celsius to be consistent? (Just change temperature_F to temperature_C and add - 32 / 1.8 to end.

Thanks

@zuckschwerdt
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  1. Rain count is 0.108 mm / each gauge flip (instead of 0.1mm) according to my tests - can this be changed?

You can change that in the code and recompile. https://github.com/merbanan/rtl_433/blob/master/src/devices/schou_72543_rain.c#L80
We don't offer "calibration", maybe you can use a bridge, see https://github.com/merbanan/rtl_433/tree/master/examples

  1. Now decoder is returning temperature in Fahrenheits and rain in mm. Could temperature to be reported in Celsius

Use -C si or convert si in a conf file.

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3 participants