Add Eurochron EFTH-800 support (closes #1375)

README.md

@@ -225,6 +225,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
     [149]  ERT
     [150]* Klimalogg
     [151]  Visonic powercode
+    [152]  Eurochron EFTH-800 temperature and humidity sensor
 
 * Disabled by default, use -R n or -G
 

conf/rtl_433.example.conf

@@ -333,6 +333,7 @@ stop_after_successful_events false
   protocol 149 # ERT
 # protocol 150 # Klimalogg
   protocol 151 # Visonic powercode
+  protocol 152 # Eurochron EFTH-800 temperature and humidity sensor
 
 ## Flex devices (command line option "-X")
 

include/rtl_433_devices.h

@@ -159,6 +159,7 @@
     DECL(ert_amr) \
     DECL(klimalogg) \
     DECL(visonic_powercode) \
+    DECL(eurochron_efth800) \
 
     /* Add new decoders here. */
 

man/man1/rtl_433.1

@@ -574,6 +574,9 @@ ERT
 .TP
 [ \fB151\fI\fP ]
 Visonic powercode
+.TP
+[ \fB152\fI\fP ]
+Eurochron EFTH\-800 temperature and humidity sensor
 
 * Disabled by default, use \-R n or \-G
 .SS "Input device selection"

src/CMakeLists.txt

@@ -57,6 +57,7 @@ add_library(r_433 STATIC
     devices/ecowitt.c
     devices/efergy_e2_classic.c
     devices/efergy_optical.c
+    devices/efth800.c
     devices/elro_db286a.c
     devices/elv.c
     devices/emontx.c

src/Makefile.am

@@ -56,6 +56,7 @@ rtl_433_SOURCES      = abuf.c \
                        devices/ecowitt.c \
                        devices/efergy_e2_classic.c \
                        devices/efergy_optical.c \
+                       devices/efth800.c \
                        devices/elro_db286a.c \
                        devices/elv.c \
                        devices/emontx.c \

src/devices/efth800.c

@@ -0,0 +1,105 @@
+/** @file
+    Eurochron EFTH-800 temperature and humidity sensor.
+
+    Copyright (c) 2020 by Christian W. Zuckschwerdt <zany@triq.net>
+
+    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
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+*/
+/**
+Eurochron EFTH-800 temperature and humidity sensor.
+
+Wakeup of short pulse, 4x 970 us gap, 990 us pulse,
+packet gap of 4900 us,
+two packets of each
+4x 750 us pulse, 720 us gap, then
+(1-bit) 500 us pulse, 230 us gap or
+(0-bit) 250 us pulse, 480 us gap.
+
+Data layout:
+
+    ?ccc iiii  iiii iiii  bntt tttt  tttt ????  hhhh hhhh  xxxx xxxx
+
+- c:  3 bit channel valid channels are 0-7 (stands for channel 1-8)
+- i: 12 bit random id (changes on power-loss)
+- b:  1 bit battery indicator (0=>OK, 1=>LOW)
+- n:  1 bit temperature sign? (0=>negative, 1=>positive)
+- t: 10 bit signed temperature, scaled by 10
+- h:  8 bit relative humidity percentage (BCD)
+- x:  8 bit CRC-8, poly 0x31, init 0x00
+- ?: unknown (Bit 0, 28-31 always 0 ?)
+
+The sensor sends messages at intervals of about 57-58 seconds.
+*/
+
+#include "decoder.h"
+
+static int eurochron_efth800_decode(r_device *decoder, bitbuffer_t *bitbuffer)
+{
+    data_t *data;
+    int row;
+    uint8_t *b;
+    int id, channel, temp_raw, humidity, battery_low;
+    float temp_c;
+
+    /* Validation checks */
+    row = bitbuffer_find_repeated_row(bitbuffer, 2, 48);
+
+    if (row < 0) // repeated rows?
+        return DECODE_ABORT_EARLY;
+
+    if (bitbuffer->bits_per_row[row] > 49) // 48 bits per row?
+        return DECODE_ABORT_LENGTH;
+
+    b = bitbuffer->bb[row];
+    bitbuffer_invert(bitbuffer);
+
+    if (crc8(b, 6, 0x31, 0x00))
+        return DECODE_FAIL_MIC; // crc mismatch
+
+    /* Extract data */
+    channel     = (b[0] & 0x30) >> 4;
+    id          = ((b[0] & 0x0f) << 8) | b[1];
+    battery_low = b[2] >> 7;
+    temp_raw    = (int16_t)((b[2] & 0x3f) << 10) | ((b[3] & 0xf0) << 2); // sign-extend
+    temp_c      = (float)(temp_raw >> 6) * 0.1;
+    humidity    = (b[4] >> 4) * 10 + (b[4] & 0xf); // BCD
+
+    /* clang-format off */
+    data = data_make(
+            "model",            "",             DATA_STRING, "Eurochron-EFTH800",
+            "id",               "",             DATA_INT,    id,
+            "channel",          "",             DATA_INT,    channel + 1,
+            "battery_ok",       "Battery",      DATA_INT,    !battery_low,
+            "temperature_C",    "Temperature",  DATA_FORMAT, "%.01f C", DATA_DOUBLE, temp_c,
+            "humidity",         "Humidity",     DATA_INT,    humidity,
+            NULL);
+    /* clang-format on */
+
+    decoder_output_data(decoder, data);
+    return 1;
+}
+
+static char *output_fields[] = {
+        "model",
+        "id",
+        "channel",
+        "battery_ok",
+        "temperature_C",
+        "humidity",
+        NULL,
+};
+
+r_device eurochron_efth800 = {
+        .name          = "Eurochron EFTH-800 temperature and humidity sensor",
+        .modulation    = OOK_PULSE_PWM,
+        .short_width   = 250,
+        .long_width    = 500,
+        .sync_width    = 750,
+        .gap_limit     = 900,
+        .reset_limit   = 5500,
+        .decode_fn     = &eurochron_efth800_decode,
+        .fields        = output_fields,
+};

vs15/rtl_433.vcxproj

@@ -180,6 +180,7 @@ COPY ..\..\libusb\MS64\dll\libusb*.dll $(TargetDir)</Command>
     <ClCompile Include="..\src\devices\ecowitt.c" />
     <ClCompile Include="..\src\devices\efergy_e2_classic.c" />
     <ClCompile Include="..\src\devices\efergy_optical.c" />
+    <ClCompile Include="..\src\devices\efth800.c" />
     <ClCompile Include="..\src\devices\elro_db286a.c" />
     <ClCompile Include="..\src\devices\elv.c" />
     <ClCompile Include="..\src\devices\emontx.c" />

vs15/rtl_433.vcxproj.filters

@@ -277,6 +277,9 @@
     <ClCompile Include="..\src\devices\efergy_optical.c">
       <Filter>Source Files\devices</Filter>
     </ClCompile>
+    <ClCompile Include="..\src\devices\efth800.c">
+      <Filter>Source Files\devices</Filter>
+    </ClCompile>
     <ClCompile Include="..\src\devices\elro_db286a.c">
       <Filter>Source Files\devices</Filter>
     </ClCompile>