Add Lidl Auriol 4-LD6313 and 4-LD5972 temperature/rain sensor (#2633)

Co-authored-by: soosp <soosp>
merbanan · Sep 25, 2023 · 2cbf3e5 · 2cbf3e5
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Showing 3 changed files with 19 additions and 10 deletions.
diff --git a/README.md b/README.md
@@ -283,7 +283,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
     [197]  Acurite Grill/Meat Thermometer 01185M
     [198]* EnOcean ERP1
     [199]  Linear Megacode Garage/Gate Remotes
-    [200]* Auriol 4-LD5661 temperature/rain sensor
+    [200]* Auriol 4-LD5661/4-LD5972/4-LD6313 temperature/rain sensors
     [201]  Unbranded SolarTPMS for trucks
     [202]  Funkbus / Instafunk (Berker, Gira, Jung)
     [203]  Porsche Boxster/Cayman TPMS

diff --git a/conf/rtl_433.example.conf b/conf/rtl_433.example.conf
@@ -426,7 +426,7 @@ stop_after_successful_events false
   protocol 197 # Acurite Grill/Meat Thermometer 01185M
 # protocol 198 # EnOcean ERP1
   protocol 199 # Linear Megacode Garage/Gate Remotes
-# protocol 200 # Auriol 4-LD5661 temperature/rain sensor
+# protocol 200 # Auriol 4-LD5661/4-LD5972/4-LD6313 temperature/rain sensors
   protocol 201 # Unbranded SolarTPMS for trucks
   protocol 202 # Funkbus / Instafunk (Berker, Gira, Jung)
   protocol 203 # Porsche Boxster/Cayman TPMS

diff --git a/src/devices/auriol_4ld5661.c b/src/devices/auriol_4ld5661.c
@@ -1,7 +1,8 @@
 /** @file
-    Auriol 4-LD5661 sensor.
+    Auriol 4-LD5661/4-LD5972/4-LD6313 sensors.
 
     Copyright (C) 2021 Balazs H.
+    Copyright (C) 2023 Peter Soos
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -10,19 +11,19 @@
 */
 
 /**
-Lidl Auriol 4-LD5661 sensor.
+Lidl Auriol 4-LD5661/4-LD5972/4-LD6313 sensors.
 
-See also issue #1857.
+See also issues #1857, #2631 and PR #2633
 
 Data layout:
 
     II B TTT F RRRRRR
 
-- I: id, 8 bit: what we've seen so far are 1a, c6
+- I: id, 8 bit: factory (hard)coded random ID
 - B: battery, 4 bit: 0x8 if normal, 0x0 if low
 - T: temperature, 12 bit: 2's complement, scaled by 10
 - F: 4 bit: seems to be 0xf constantly, a separator between temp and rain
-- R: rain sensor, probably the remaining 24 bit: a counter for every 0.3mm of rain
+- R: rain sensor, probably the remaining 24 bit: a counter for every 0.3 mm (4-LD5661) or 0.242 mm (4-LD6313)
 
 */
 
@@ -52,11 +53,17 @@ static int auriol_4ld5661_decode(r_device *decoder, bitbuffer_t *bitbuffer)
 
         int rain_raw = (b[4] << 12) | (b[5] << 4) | b[6] >> 4;
 
-        /* The display unit which comes with this device, multiplies gauge tip counts by 0.3 mm, which seems
+        /* The display unit which comes with this devices, multiplies gauge tip counts by 0.3 mm, which seems
            to be very inaccurate. We did a lot of measurements, the gauge's capacity is about 7.5 ml, the
            rain collection surface diameter is 96mm, 7.5 ml /((9.6 cm/2)^2*pi) ~= 1 mm of rain. Therefore
            we decided to correct this multiplier.
-           See also: https://github.com/merbanan/rtl_433/issues/1837
+           The rain bucket tips at 7.2 ml for 4-LS6313. The main unit counts 0.242 mm per sensor tips.
+           The physical parameters are same. The calculation and the result is similar:
+               7.2 ml / ((96 mm / 2)^2 * pi) ~= 1 mm (more exactly 0.995 mm).
+           Similar calculation is valid for 4-LD5972 (See PR #2633).
+           See also:
+               https://github.com/merbanan/rtl_433/issues/1837
+               https://github.com/merbanan/rtl_433/pull/2633
         */
         float rain   = rain_raw * 1.0F;
 
@@ -67,6 +74,7 @@ static int auriol_4ld5661_decode(r_device *decoder, bitbuffer_t *bitbuffer)
                 "battery_ok",       "Battery OK",   DATA_INT, batt_ok,
                 "temperature_C",    "Temperature",  DATA_FORMAT, "%.01f C", DATA_DOUBLE, temp_c,
                 "rain_mm",          "Rain",         DATA_FORMAT, "%.01f mm", DATA_DOUBLE, rain,
+                "rain",             "Rain tips",    DATA_INT, rain_raw,
                 NULL);
         /* clang-format on */
 
@@ -83,11 +91,12 @@ static char const *const output_fields[] = {
         "battery_ok",
         "temperature_C",
         "rain_mm",
+        "rain",
         NULL,
 };
 
 r_device const auriol_4ld5661 = {
-        .name        = "Auriol 4-LD5661 temperature/rain sensor",
+        .name        = "Auriol 4-LD5661/4-LD5972/4-LD6313 temperature/rain sensors",
         .modulation  = OOK_PULSE_PPM,
         .short_width = 1000,
         .long_width  = 2000,