diff --git a/README.md b/README.md
index 42c5a414..b765f177 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
```
A "rtl_433.conf" file is searched in "./", XDG_CONFIG_HOME e.g. "$HOME/.config/rtl_433/",
- "/usr/local/etc/rtl_433/", "/etc/rtl_433/", then command line args will be parsed in order.
+ SYSCONFDIR e.g. "/usr/local/etc/rtl_433/", then command line args will be parsed in order.
= General options =
[-V] Output the version string and exit
[-v] Increase verbosity (can be used multiple times).
@@ -314,7 +314,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
[226] Kia TPMS (-s 1000k)
[227] SRSmith Pool Light Remote Control SRS-2C-TX (-f 915M)
[228] Neptune R900 flow meters
- [229]* WEC-2103 temperature/humidity sensor
+ [229] WEC-2103 temperature/humidity sensor
[230] Vauno EN8822C
[231] Govee Water Leak Detector H5054
[232] TFA Dostmann 14.1504.V2 Radio-controlled grill and meat thermometer
@@ -326,7 +326,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
[238] Wireless M-Bus, Mode T, 32.768kbps (-f 868.3M -s 1000k)
[239] Revolt NC-5642 Energy Meter
[240] LaCrosse TX31U-IT, The Weather Channel WS-1910TWC-IT
- [241] EezTire E618 (TPMS10ATC)
+ [241] EezTire E618, Carchet TPMS
[242]* Baldr / RainPoint rain gauge.
[243] Celsia CZC1 Thermostat
[244] Fine Offset Electronics WS90 weather station
diff --git a/conf/rtl_433.example.conf b/conf/rtl_433.example.conf
index dae99aa4..2f9884c5 100644
--- a/conf/rtl_433.example.conf
+++ b/conf/rtl_433.example.conf
@@ -455,7 +455,7 @@ convert si
protocol 226 # Kia TPMS (-s 1000k)
protocol 227 # SRSmith Pool Light Remote Control SRS-2C-TX (-f 915M)
protocol 228 # Neptune R900 flow meters
-# protocol 229 # WEC-2103 temperature/humidity sensor
+ protocol 229 # WEC-2103 temperature/humidity sensor
protocol 230 # Vauno EN8822C
protocol 231 # Govee Water Leak Detector H5054
protocol 232 # TFA Dostmann 14.1504.V2 Radio-controlled grill and meat thermometer
@@ -467,7 +467,7 @@ convert si
protocol 238 # Wireless M-Bus, Mode T, 32.768kbps (-f 868.3M -s 1000k)
protocol 239 # Revolt NC-5642 Energy Meter
protocol 240 # LaCrosse TX31U-IT, The Weather Channel WS-1910TWC-IT
- protocol 241 # EezTire E618 (TPMS10ATC)
+ protocol 241 # EezTire E618, Carchet TPMS
# protocol 242 # Baldr / RainPoint rain gauge.
protocol 243 # Celsia CZC1 Thermostat
protocol 244 # Fine Offset Electronics WS90 weather station
diff --git a/man/man1/rtl_433.1 b/man/man1/rtl_433.1
index 66481a1f..c733aa09 100644
--- a/man/man1/rtl_433.1
+++ b/man/man1/rtl_433.1
@@ -40,7 +40,7 @@ Detailed information on some options follows.
A "rtl_433.conf" file is searched in "./", XDG_CONFIG_HOME e.g. "$HOME/.config/rtl_433/",
- "/usr/local/etc/rtl_433/", "/etc/rtl_433/", then command line args will be parsed in order.
+ SYSCONFDIR e.g. "/usr/local/etc/rtl_433/", then command line args will be parsed in order.
.SS "General options"
.TP
[ \fB\-V\fI\fP ]
diff --git a/src/devices/tpms_eezrv.c b/src/devices/tpms_eezrv.c
index 8191cd47..46004dde 100644
--- a/src/devices/tpms_eezrv.c
+++ b/src/devices/tpms_eezrv.c
@@ -1,7 +1,7 @@
/** @file
- EezTire E618 TPMS.
+ EezTire E618 TPMS and Carchet TPMS (same protocol).
- Copyright (C) 2023 Bruno OCTAU (ProfBoc75) and Gliebig
+ Copyright (C) 2023 Bruno OCTAU (ProfBoc75), Gliebig, and Karen Suhm
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
@@ -12,22 +12,48 @@
#include "decoder.h"
/**
-EezTire E618 TPMS.
+EezTire E618 TPMS and Carchet TPMS (same protocol).
Eez RV supported TPMS sensor model E618 : https://eezrvproducts.com/shop/ols/products/tpms-system-e518-anti-theft-replacement-sensor-1-ea
+Carchet TPMS: http://carchet.easyofficial.com/carchet-rv-trailer-car-solar-tpms-tire-pressure-monitoring-system-6-sensor-lcd-display-p6.html
-S.a issue #2384, #2657
+The device uses OOK (ASK) encoding.
+The device sends a transmission every 1 second when quick deflation is detected, every 13 - 23 sec when quick inflation is detected, and every 4 min 40 s under steady state pressure.
+A transmission starts with a preamble of 0x0000 and the packet is sent twice.
-Data layout:
+S.a issue #2384, #2657, #2063, #2677
+
+Data collection parameters on URH software were as follows:
+ Sensor frequency: 433.92 MHz
+ Sample rate: 2.0 MSps
+ Bandwidth: 2.0 Hz
+ Gain: 125
+
+ Modulation is ASK (OOK). Packets in URH arrive in the following format:
+
+ aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa [Pause: 897679 samples]
+ aaaaaaaa5956a5a5a6555aaa65959999a5aaaaaa [Pause: 6030 samples]
+ aaaaaaaa5956a5a5a6555aaa65959999a5aaaaaa [Pause: 11176528 samples]
+
+ Decoding is Manchester I. After decoding, the packets look like this:
+
+ 00000000000000000000000000000000000000
+ 0000de332fc0b7553000
+ 0000de332fc0b7553000
+
+ Using rtl_433 software, packets were detected using the following command line entry:
+ rtl_433 -X "n=Carchet,m=OOK_MC_ZEROBIT,s=50,l=50,r=1000,invert" -s 1M
+
+ Data layout:
PRE CC IIIIII PP TT FF FF
- PRE : FFFF
-- C : 8 bit CheckSum
-- I: 24 bit ID
+- C : 8 bit CheckSum, modulo 256 with overflow flag
+- I: 24 bit little-endian ID
- P: 8 bit pressure P * 2.5 = Pressure kPa
- T: 8 bit temperature T - 50 = Temperature C
-- F: 16 bit battery (not verified), deflation pressure (for sure), pressure MSB
+- F: 16 bit status flags: 0x8000 = low battery, 0x1000 = quick deflation, 0x3000 = quick inflation, 0x0000 = static/steady state
Raw Data example :
@@ -83,12 +109,16 @@ static int tpms_eezrv_decode(r_device *decoder, bitbuffer_t *bitbuffer)
int temperature_C = b[4] - 50;
int flags1 = b[5];
int flags2 = b[6];
- int fast_leak_detected = (flags1 & 0x10);
- int fast_leak_resolved = (flags1 & 0x20);
+ int fast_leak_detected = (flags1 & 0x10); // fast leak - reports every second
+ int infl_detected = (flags1 & 0x20) >> 5; // inflating - reports every 15 - 20 sec
- int fast_leak = fast_leak_detected && !fast_leak_resolved;
+ int fast_leak = fast_leak_detected && !infl_detected;
float pressure_kPa = (((flags2 & 0x01) << 8) + b[3]) * 2.5;
+ // Low batt = 0x8000;
+ int low_batt = flags1 >> 7; // Low batt flag is MSB (activated at V < 3.15 V)(Device fails at V < 3.10 V)
+ // Mystery flag at (flags2 & 0x20) showed up during low batt testing
+
char id_str[7];
snprintf(id_str, sizeof(id_str), "%02x%02x%02x", b[0], b[1], b[2]);
@@ -100,10 +130,12 @@ static int tpms_eezrv_decode(r_device *decoder, bitbuffer_t *bitbuffer)
"model", "", DATA_STRING, "EezTire-E618",
"type", "", DATA_STRING, "TPMS",
"id", "", DATA_STRING, id_str,
+ "battery_ok", "Battery_OK", DATA_INT, !low_batt,
"pressure_kPa", "Pressure", DATA_FORMAT, "%.0f kPa", DATA_DOUBLE, (double)pressure_kPa,
"temperature_C", "Temperature", DATA_FORMAT, "%.1f C", DATA_DOUBLE, (double)temperature_C,
- "fast_leak", "Fast Leak", DATA_INT, fast_leak,
"flags", "Flags", DATA_STRING, flags_str,
+ "fast_leak", "Fast Leak", DATA_INT, fast_leak,
+ "inflate", "Inflate", DATA_INT, infl_detected,
"mic", "Integrity", DATA_STRING, "CHECKSUM",
NULL);
/* clang-format on */
@@ -116,16 +148,18 @@ static char const *const output_fields[] = {
"model",
"type",
"id",
- "temperature_C",
+ "battery_ok",
"pressure_kPa",
- "fast_leak",
+ "temperature_C",
"flags",
+ "fast_leak",
+ "inflate",
"mic",
NULL,
};
r_device const tpms_eezrv = {
- .name = "EezTire E618",
+ .name = "EezTire E618, Carchet TPMS",
.modulation = OOK_PULSE_MANCHESTER_ZEROBIT,
.short_width = 50,
.long_width = 50,