Add support for Geevon TX16-3 outdoor sensor

Co-authored-by: Matt Falcon <FalconFour@users.noreply.github.com>

README.md

@@ -346,6 +346,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
     [258]  Chamberlain CWPIRC PIR Sensor
     [259]  ThermoPro TP829b Meat Thermometer 4 coated probes
     [260]* Arad/Master Meter Dialog3G water utility meter
+    [261]  Geevon TX16-3 outdoor sensor
 
 * Disabled by default, use -R n or a conf file to enable
 

conf/rtl_433.example.conf

@@ -487,6 +487,7 @@ convert si
   protocol 258 # Chamberlain CWPIRC PIR Sensor
   protocol 259 # ThermoPro TP829b Meat Thermometer 4 coated probes
 # protocol 260 # Arad/Master Meter Dialog3G water utility meter
+  protocol 261 # Geevon TX16-3 outdoor sensor
 
 ## Flex devices (command line option "-X")
 

include/rtl_433_devices.h

@@ -268,6 +268,7 @@
     DECL(chamberlain_cwpirc) \
     DECL(thermopro_tp829b) \
     DECL(arad_ms_meter) \
+    DECL(geevon) \
 
     /* Add new decoders here. */
 

src/CMakeLists.txt

@@ -124,6 +124,7 @@ add_library(r_433 STATIC
     devices/funkbus.c
     devices/gasmate_ba1008.c
     devices/ge_coloreffects.c
+    devices/geevon.c
     devices/generic_motion.c
     devices/generic_remote.c
     devices/generic_temperature_sensor.c

src/devices/geevon.c

@@ -0,0 +1,126 @@
+/** @file
+    Geevon TX16-3 Remote Outdoor Sensor with LCD Display.
+
+    Contributed by Matt Falcon <falcon4@gmail.com>
+
+    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.
+*/
+
+#include "decoder.h"
+
+/**
+Geevon TX16-3 Remote Outdoor Sensor with LCD Display.
+
+This device is a simple temperature/humidity transmitter with a small LCD display for local viewing.
+
+The test packet represents:
+- channel 1
+- battery OK
+- temperature of 62.6 Fahrenheit or 17 Celsius
+- 43% relative humidity.
+
+Data layout:
+
+    Byte 0   Byte 1   Byte 2   Byte 3   Byte 4   Byte 5   Byte 6   Byte 7   Byte 8
+    IIIIIIII BxCCxxxx TTTTTTTT TTTT0000 HHHHHHHH FFFFFFFF FFFFFFFF FFFFFFFF CCCCCCCC
+       87       00       29       e0       2b       aa       55       aa       e8
+
+- I: ID?
+- B: Battery low status (0 = good, 1 = low battery)
+- C: Channel (0, 1, 2 as channels 1, 2, 3)
+- T: Temperature - represented as ((degrees C * 10) + 500)
+- H: Relative humidity - represented as percentage %
+- F: Integrity check - 3 bytes are always 0xAA 0x55 0xAA
+- X: CRC checksum (CRC-8 poly 0x31 init=0x7b)
+
+Format string:
+
+    ID:8h BATT:b ?:b CHAN:2h FLAGS:4h TEMP_C:12d PAD:4h HUM:8d FIX:24h CRC:8h 1x
+
+Example packets:
+
+    f4002ac039aa55aa11
+    f4002ab039aa55aa54
+    f4002aa039aa55aa28
+    f4002a9039aa55aaac
+
+*/
+
+static int geevon_callback(r_device *decoder, bitbuffer_t *bitbuffer)
+{
+    // invert all the bits
+    bitbuffer_invert(bitbuffer);
+
+    // find the most common row, nominal we expect 5 packets
+    int r = bitbuffer_find_repeated_prefix(bitbuffer, bitbuffer->num_rows > 5 ? 5 : 3, 72);
+    if (r < 0) {
+        return DECODE_ABORT_LENGTH;
+    }
+
+    // work with the best/most repeated capture
+    uint8_t *b = bitbuffer->bb[r];
+
+    // Check if the packet has the correct number of bits
+    if (bitbuffer->bits_per_row[r] != 73) {
+        return DECODE_ABORT_LENGTH;
+    }
+
+    // Check if the fixed bytes are correct
+    if (b[5] != 0xAA || b[6] != 0x55 || b[7] != 0xAA) {
+        return DECODE_FAIL_MIC;
+    }
+
+    // Verify CRC checksum
+    uint8_t chk = crc8(b, 9, 0x31, 0x7b);
+    if (chk) {
+        return DECODE_FAIL_MIC;
+    }
+
+    // Extract the data from the packet
+    int battery_low = (b[1] >> 7);              // 0x00: battery good, 0x80: battery low
+    int channel     = ((b[1] & 0x30) >> 4) + 1; // channel: 1, 2, 3
+    int temp_raw    = (b[2] << 4) | (b[3] >> 4);
+    float temp_c    = (temp_raw - 500) * 0.1f; // temperature is ((degrees c + 500) * 10)
+    int humidity    = b[4];
+
+    // Store the decoded data
+    /* clang-format off */
+    data_t *data = data_make(
+            "model",            "",             DATA_STRING, "Geevon-TX163",
+            "id",               "",             DATA_INT,    b[0],
+            "battery_ok",       "Battery",      DATA_INT,    !battery_low,
+            "channel",          "Channel",      DATA_INT,    channel,
+            "temperature_C",    "Temperature",  DATA_FORMAT, "%.1f C", DATA_DOUBLE, temp_c,
+            "humidity",         "Humidity",     DATA_FORMAT, "%u %%", DATA_INT,     humidity,
+            "mic",              "Integrity",    DATA_STRING, "CRC",
+            NULL);
+    /* clang-format on */
+
+    decoder_output_data(decoder, data);
+    return 1;
+}
+
+static char const *const output_fields[] = {
+        "model",
+        "battery",
+        "channel",
+        "temperature_C",
+        "humidity",
+        "mic",
+        NULL,
+};
+
+r_device const geevon = {
+        .name        = "Geevon TX16-3 outdoor sensor",
+        .modulation  = OOK_PULSE_PWM,
+        .short_width = 250,
+        .long_width  = 500,
+        .sync_width  = 750,  // sync pulse is 728 us + 728 us gap
+        .gap_limit   = 625,  // long gap (with short pulse) is ~472 us, sync gap is ~728 us
+        .reset_limit = 1700, // maximum gap is 1250 us (long gap + longer sync gap on last repeat)
+        .decode_fn   = &geevon_callback,
+        .fields      = output_fields,
+};