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minor: Update style on Renault-0435R

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This commit is contained in:
Christian W. Zuckschwerdt
2022-01-30 11:10:52 +01:00
parent 3e21d82a88
commit 1566d8bb27
4 changed files with 56 additions and 57 deletions
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1
README.md
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@@ -295,6 +295,7 @@ See [CONTRIBUTING.md](./docs/CONTRIBUTING.md).
[209] SimpliSafe Gen 3 Home Security System
[210] Yale HSA (Home Security Alarm), YES-Alarmkit
[211] Regency Ceiling Fan Remote (-f 303.75M to 303.96M)
[212] Renault 0435R TPMS
* Disabled by default, use -R n or -G

1
conf/rtl_433.example.conf
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@@ -437,6 +437,7 @@ stop_after_successful_events false
protocol 209 # SimpliSafe Gen 3 Home Security System
protocol 210 # Yale HSA (Home Security Alarm), YES-Alarmkit
protocol 211 # Regency Ceiling Fan Remote (-f 303.75M to 303.96M)
protocol 212 # Renault 0435R TPMS
## Flex devices (command line option "-X")

5
src/devices/bresser_6in1.c
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@@ -64,7 +64,10 @@ Moisture is transmitted in the humidity field as index 1-16: 0, 7, 13, 20, 27, 3
{150} 5c e4 18 80 02 c3 18 fb ba fc 26 98 11 84 81 ff f0 16 00 [Temp 11.8 C Hum 81%]
{148} d0 bd 18 80 02 c3 18 f9 ad fa 26 48 ff ff ff fe 02 ff f0
DIGEST:8h8h ID?8h8h8h8h FLAGS:4h BATT:1b CH:3d WSPEED:~8h~4h ~4h~8h WDIR:12h ?4h TEMP8h.4h ?4h HUM8h UV?~12h ?4h CHKSUM:8h
Wind and Temperature/Humidity or Rain:
DIGEST:8h8h ID:8h8h8h8h FLAGS:4h BATT:1b CH:3d WSPEED:~8h~4h ~4h~8h WDIR:12h ?4h TEMP:8h.4h ?4h HUM:8h UV?~12h ?4h CHKSUM:8h
DIGEST:8h8h ID:8h8h8h8h FLAGS:4h BATT:1b CH:3d WSPEED:~8h~4h ~4h~8h WDIR:12h ?4h RAINFLAG:8h RAIN:8h8h UV:8h8h CHKSUM:8h
Digest is LFSR-16 gen 0x8810 key 0x5412, excluding the add-checksum and trailer.
Checksum is 8-bit add (with carry) to 0xff.

106
src/devices/tpms_renault_0435r.c
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@@ -10,20 +10,21 @@
*/
/**
FSK 9 byte Manchester encoded TPMS with xor checksum, Renault 0435R.
Part no:
Renault 40700 0435R
VDO S180052064Z
- Renault 40700 0435R
- VDO S180052064Z
List of compatible Renault vehicles (from: https://www.vdo.com/media/190553/vdo-2017-tpms_2017-05-03.pdf)
FLUENCE (L30_)
LAGUNA III (BT0/1)
LAGUNA III Grandtour (KT0/1)
LATITUDE (L70_)
MEGANE III Coupe (DZ0/1_)
MEGANE III Grandtour (KZ0/1)
MEGANE III Hatchback(BZ0_)
SCÉNIC III (JZ0/1_)
ZOE (BFM_)
- FLUENCE (L30_)
- LAGUNA III (BT0/1)
- LAGUNA III Grandtour (KT0/1)
- LATITUDE (L70_)
- MEGANE III Coupe (DZ0/1_)
- MEGANE III Grandtour (KZ0/1)
- MEGANE III Hatchback(BZ0_)
- SCÉNIC III (JZ0/1_)
- ZOE (BFM_)
Packet nibbles:
@@ -44,25 +45,26 @@ Note: Pressure unit of 4/3 kPa is a guess, one of possible alternatives
the precision of the sensor anyways.
Note: Centrifugal acceleration unit guessed by following calculation:
I have tires 195/65R15:
tire height over wheel: s = 195mm * 65% = 0.12675m
radius of wheel without tire: r₀ = 15''/2 = 0.1905m
radius of tire: r = r₀ + s = 0.31725m
cirumference of tire: c = 2πr = 0.31725m * 6.283186 = 1.99334m
Centrifugal acceleration at circumference of a tire (a) is related to the centrifugal
acceleration at sensor (a₀) by ratio of radius of tire and position of sensor,
which we guess is located exactly at the edge between the wheel and the tire.
a₀ = a * r₀/r
Radial acceleration at circumference of tire can be calculated by formula
a = v²/r where v is speed of the vehicle
Thus centrifugal acceleration at the sensor should be:
a₀ = v² * r₀/r² = (KPH² / 3.6²) * (r₀/r²)
- I have tires 195/65R15:
- tire height over wheel: s = 195mm * 65% = 0.12675m
- radius of wheel without tire: r₀ = 15''/2 = 0.1905m
- radius of tire: r = r₀ + s = 0.31725m
- cirumference of tire: c = 2πr = 0.31725m * 6.283186 = 1.99334m
I get a₀ = KPH² * 0.146 for my tires. I plugged in speed obtained by OBD interface
(which matches GPS speed with less than 1% accuracy (yes it is lower than speed
displayed to driver)), and got values exactly five times greater than values
reported by the sensor for speeds under 93 kph. The sensor sends 255 when value does
not fit into 8 bits (that is for speeds above 93 kph on my tires).
Centrifugal acceleration at circumference of a tire (a) is related to the centrifugal
acceleration at sensor (a₀) by ratio of radius of tire and position of sensor,
which we guess is located exactly at the edge between the wheel and the tire.
a₀ = a * r₀/r
Radial acceleration at circumference of tire can be calculated by formula
a = v²/r where v is speed of the vehicle
Thus centrifugal acceleration at the sensor should be:
a₀ = v² * r₀/r² = (KPH² / 3.6²) * (r₀/r²)
I get a₀ = KPH² * 0.146 for my tires. I plugged in speed obtained by OBD interface
(which matches GPS speed with less than 1% accuracy (yes it is lower than speed
displayed to driver)), and got values exactly five times greater than values
reported by the sensor for speeds under 93 kph. The sensor sends 255 when value does
not fit into 8 bits (that is for speeds above 93 kph on my tires).
*/
@@ -70,54 +72,49 @@ Note: Centrifugal acceleration unit guessed by following calculation:
static int tpms_renault_0435r_decode(r_device *decoder, bitbuffer_t *bitbuffer, unsigned row, unsigned bitpos)
{
data_t *data;
bitbuffer_t packet_bits = {0};
uint8_t *b;
int flags;
char flags_str[3];
char id_str[7];
int pressure_datorr, temp_c, rad_acc, tick, has_tick;
double pressure_kpa;
int checksum;
bitbuffer_manchester_decode(bitbuffer, row, bitpos, &packet_bits, 160);
// require 72 data bits
if (packet_bits.bits_per_row[0] < 72) {
return 0;
return DECODE_ABORT_EARLY;
}
b = packet_bits.bb[0];
uint8_t *b = packet_bits.bb[0];
// check checksum (checksum8 xor)
checksum = xor_bytes(b, 9);
if (checksum != 0) {
return 0;
int chk = xor_bytes(b, 9);
if (chk != 0) {
return DECODE_FAIL_MIC;
}
tick = b[8] & 0x7f;
has_tick = b[8] >> 7;
int tick = b[8] & 0x7f;
int has_tick = b[8] >> 7;
// Sensor begins with has_tick = 1, and tick = 0. It sends data every 4.5s
// and increments tick. Value tick >= 30 is never send, sensor instead
// drops flag has_tick, and sets tick = 0 for rest of measurement session.
// Tick counter is reset by several minutes of inactivity (vehicle stopped).
if (b[8] && (!has_tick || tick > 30)) {
return 0;
return DECODE_FAIL_SANITY;
}
flags = b[3];
int flags = b[3];
// observed always 0xc0 - FIXME: find possible combinations and reject message with impossible combination
// to avoid confusion with other FSK manchester 9-byte sensors with 8bit xor checksum.
char id_str[7];
sprintf(id_str, "%02x%02x%02x", b[0], b[1], b[2]);
char flags_str[3];
sprintf(flags_str, "%02x", flags);
pressure_datorr = b[4];
pressure_kpa = pressure_datorr / 0.75;
temp_c = (int)b[5] - 50;
rad_acc = (int)b[6] * 5;
int pressure_raw = b[4];
double pressure_kpa = pressure_raw / 0.75;
int temp_c = (int)b[5] - 50;
int rad_acc = (int)b[6] * 5;
/* clang-format off */
data = data_make(
data_t *data = data_make(
"model", "", DATA_STRING, "Renault-0435R",
"type", "", DATA_STRING, "TPMS",
"id", "", DATA_STRING, id_str,
@@ -141,15 +138,13 @@ static int tpms_renault_0435r_callback(r_device *decoder, bitbuffer_t *bitbuffer
// full preamble is 55 55 55 56 (inverted: aa aa aa a9)
uint8_t const preamble_pattern[2] = {0xaa, 0xa9}; // 16 bits
int row;
unsigned bitpos;
int ret = 0;
int events = 0;
bitbuffer_invert(bitbuffer);
for (row = 0; row < bitbuffer->num_rows; ++row) {
bitpos = 0;
for (int row = 0; row < bitbuffer->num_rows; ++row) {
unsigned bitpos = 0;
// Find a preamble with enough bits after it that it could be a complete packet
while ((bitpos = bitbuffer_search(bitbuffer, row, bitpos,
preamble_pattern, 16)) +
@@ -186,6 +181,5 @@ r_device tpms_renault_0435r = {
.long_width = 52, // FSK
.reset_limit = 150, // Maximum gap size before End Of Message [us].
.decode_fn = &tpms_renault_0435r_callback,
.disabled = 0,
.fields = output_fields,
};