Add support for Arexx Multilogger (#2487)
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Christian W. Zuckschwerdt
GitHub
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5 changed files with 159 additions and 0 deletions
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@ -349,6 +349,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
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[261] Geevon TX16-3 outdoor sensor
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[262] Fine Offset Electronics WH46 air quality sensor
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[263] Vevor Wireless Weather Station 7-in-1
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[264] Arexx Multilogger IP-HA90, IP-TH78EXT, TSN-70E
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* Disabled by default, use -R n or a conf file to enable
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@ -490,6 +490,7 @@ convert si
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protocol 261 # Geevon TX16-3 outdoor sensor
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protocol 262 # Fine Offset Electronics WH46 air quality sensor
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protocol 263 # Vevor Wireless Weather Station 7-in-1
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protocol 264 # Arexx Multilogger IP-HA90, IP-TH78EXT, TSN-70E
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## Flex devices (command line option "-X")
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@ -271,6 +271,7 @@
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DECL(geevon) \
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DECL(fineoffset_wh46) \
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DECL(vevor_7in1) \
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DECL(arexx_ml) \
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/* Add new decoders here. */
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@ -54,6 +54,7 @@ add_library(r_433 STATIC
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devices/ant_antplus.c
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devices/arad_ms_meter.c
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devices/archos_tbh.c
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devices/arexx_ml.c
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devices/atech_ws308.c
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devices/auriol_4ld5661.c
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devices/auriol_aft77b2.c
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155
src/devices/arexx_ml.c
Normal file
155
src/devices/arexx_ml.c
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@ -0,0 +1,155 @@
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/** @file
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Arexx Multilogger.
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Copyright (C) 2023 Christian W. Zuckschwerdt <zany@triq.net>
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Protocol analysis by MacH-21, TSN-70E by inonoob.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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*/
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#include "decoder.h"
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/**
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Arexx Multilogger.
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- Arexx IP-HA90 (MCP9808 sensor) s.a. #2388
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- Arexx IP-TH78EXT
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- Arexx TSN-70E (Sensirion SHT-10 sensor) s.a. #2482
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The IP-HA90 has a Microchip RFPIC12f675f at 433.92M and a Microchip MCP9808 temperature sensor.
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The TSN-70E has a Sensirion SHT-10 temperature and humidity and temperature sensor.
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FSK modulated with Manchester encoding, half-bit width is 208 us (2400bps MC).
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The sensors transmit approx. every 45 seconds alternating Temperature/Humidity.
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Polarity is inverted (IEEE MC) and the preamble+sync is aaaaaaaa55.
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Integrity check is done using CRC8 using poly=0x31 init=0x00.
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Example raw messages:
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55555555aa f8 71fe fedf f777 5b a4 ff
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55555555aa f8 71fe fedf f727 80 7f ff
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55555555aa f8 71fe fedf f6e7 8e 71 ff
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55555555aa f8 71fe fedf f69f b4 4b ff
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55555555aa f8 71fe fedf f66f c0 3f ff
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55555555aa f8 71fe fedf f63f 1b e4 ff
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55555555aa f8 71fe fedf f61f 38 c7 ff
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55555555aa f8 71fe fedf f607 67 98 ff
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55555555aa f8 71fe fedf f5f7 46 b9 ff
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55555555aa f8 71fe fedf f5d7 65 9a ff
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55555555aa f8 71fe fedf f5b7 00 ff ff
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55555555aa f8 71fe fedf f59f e1 1e ff
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55555555aa fa 15b2 e90f 6c ff faf7 7b1c e3
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55555555aa fa 14b2 f90e 51 ff faf7 7b1a e41
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55555555aa fa 14b2 f991 01 ff faf7 7b2a 401
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55555555aa fa 15b2 e678 0f ff faf7 7bf8 41
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Message format (preamble 5555aa then invert):
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LEN:8h ID:<16h SENS:16h ?:8h8h CHK:8h CHKINV:8h 16x
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Message layout:
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LL IIII SSSS UUUU XX YY
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- L : 8 bit: message length 7 or 5 (including length byte, excluding checksum)
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- I : 16 bit: ID, little-endian, even number = Temperature
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- S : 16 bit: raw sensor value
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- U : 16 bit: optional extra data, unknown
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- X : 8 bit: CRC, poly 0x31, init 0xc0
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- Y : 8 bit: inverted CRC check, only IP-HA90
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*/
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static int arexx_ml_decode(r_device *decoder, bitbuffer_t *bitbuffer)
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{
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uint8_t const preamble[] = {0xaa, 0xaa, 0x55}; // 24 bits
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if (bitbuffer->num_rows != 1) {
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return DECODE_ABORT_EARLY; // we expect a single row
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}
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if (bitbuffer->bits_per_row[0] < 64 || bitbuffer->bits_per_row[1] > 130) {
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return DECODE_ABORT_EARLY; // we expect around 88 to 104 bits
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}
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bitbuffer_invert(bitbuffer);
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int msg_len = -1;
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uint8_t b[9]; // allow up to 9 byte messages
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for (int i = 0; i < bitbuffer->num_rows; ++i) {
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unsigned pos = bitbuffer_search(bitbuffer, i, 0, preamble, 24);
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pos += 24;
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if (pos + 64 > bitbuffer->bits_per_row[i])
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continue; // too short or not found
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bitbuffer_extract_bytes(bitbuffer, i, pos, b, sizeof(b) * 8);
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msg_len = b[0];
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break;
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}
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if (msg_len <= 0) {
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decoder_log(decoder, 2, __func__, "Couldn't find preamble");
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return DECODE_FAIL_SANITY;
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}
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int chk = crc8le(b, msg_len, 0x31, 0x00);
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if (chk != b[msg_len]) { // || (chk ^ b[msg_len + 1]) != 0) {
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decoder_log(decoder, 2, __func__, "CRC fail");
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return DECODE_FAIL_MIC;
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}
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// Extract data from buffer
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int id = (b[2] << 8) | (b[1]); // little-endian
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int sens_val = (b[3] << 8) | (b[4]); // big-endian?
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int is_humi = id & 1; // even number: Temperature, odd number: Humidity
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// MCP9808 Ambient Temperature Register "5-4":
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int temp_alert = (sens_val >> 13) & 7;
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int temp_raw = (int16_t)(sens_val << 3); // uses sign-extend
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float temp_c = temp_raw / 128;
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if (msg_len == 5) { // not sure if this is the proper check
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// SHT10 Temperature
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temp_c = sens_val * 0.01f - 40.0f; // offset actually varies by Vdd
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}
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// SHT10 Humidity
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float humidity = -2.0468 + 0.0367 * sens_val - 1.5955E-6 * sens_val * sens_val;
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/* clang-format off */
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data_t *data = data_make(
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"model", "", DATA_STRING, "Arexx-ML",
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"id", "ID", DATA_FORMAT, "%04x", DATA_INT, id,
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"temperature_C", "Temperature", DATA_COND, !is_humi, DATA_FORMAT, "%.2f C", DATA_DOUBLE, temp_c,
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"temperature_alert", "Alert", DATA_COND, !is_humi, DATA_FORMAT, "%x", DATA_INT, temp_alert,
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"humidity", "Humidity", DATA_COND, is_humi, DATA_FORMAT, "%.1f %%", DATA_DOUBLE, humidity,
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"sensor_raw", "Sensor Raw", DATA_FORMAT, "%04x", DATA_INT, sens_val,
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"mic", "Integrity", DATA_STRING, "CRC",
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NULL);
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/* clang-format on */
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decoder_output_data(decoder, data);
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return 1;
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}
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static char const *const arexx_ml_output_fields[] = {
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"model",
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"id",
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"temperature_C",
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"temperature_alert",
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"humidity",
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"sensor_raw",
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"mic",
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NULL,
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};
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r_device const arexx_ml = {
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.name = "Arexx Multilogger IP-HA90, IP-TH78EXT, TSN-70E",
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.modulation = FSK_PULSE_MANCHESTER_ZEROBIT,
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.short_width = 208, // 2400bps MC
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.long_width = 208, // not used
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.reset_limit = 450,
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.decode_fn = &arexx_ml_decode,
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.fields = arexx_ml_output_fields,
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};
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