Analysis and decoding of temperatures and humidity values sent by this wireless sensor.
| Item | Value | Description |
|---|---|---|
| Frequency | 433.964 MHz | |
| Wavelength | 69 cm | λ=c/f |
| Modulation | On-off keying (OOK) | |
| Symbols | Pulse Width Modulation |
Pulse lengths Tp are decoded as follows:
| Timing | Tp <= 390µs | Tp > 390µs |
|---|---|---|
| Symbol | Short |
Long |
Gaps lengths Tg are decoded as follows:
| Timing | Tg <= 1140µs | Tg > 1140µs | Tg > 1550µs |
|---|---|---|---|
| Symbol | Short |
Long |
Reset |
The resulting symbols are decoded as follows:
| Symbol | Short |
Long |
Reset |
|---|---|---|---|
| Pulse | 1 |
0 |
Error |
| Gap | (skip) | 0 |
Reset |
Please note that the stream-decoder adapts the values for short/long symbols for each packet by creating and evaluating a histogram of all pulse and gap lengths.
After decoding all symbols to bits, the resulting bitstream contains 90 bits and must be further processed as follows:
- Extract parity bits and data bytes
- Reverse data bytes (swap MSB and LSB)
- Invert each bit of the data bytes (xor 0xff)
- Check parity bits and frame length
- Extract sensor signals
Time-Axis in ms
GNU radio block process the raw data in chunks. So the decoder must be able to handle these as well.
- decoder.grc - GNU Radio file
- stream_decoder.py - stand-alone decoder for raw binary (demodulated) data
The signal can also be decoded with a cheap transceiver on a Raspberry Pi.
- RXB8 433 Mhz Superheterodyne Receiver and Datasheet
- 433 MHz Coil Loaded Antenna
- 2 Resistors (1kΩ and 2.2kΩ)
- some wiring and connectors
Raspi GPIO have a maximum rating of 3.5V. The output level on DATA is 4.5V so you MUST use a voltage divider to connect the data-pin to the Raspi:
| Schematic | Breadboard |
|---|---|
 |
 |
You can use any two resistors that have a ratio of 1:2 for that divider, but keep in mind, that the input impendance of a GPIO port is around 50k. So better stay well below 10k with your resistors (see GPIO Electrical Specifications).
- install pigpio library
- see rxb8/decoder.py
Use the rtl_433-tool to decode the values for reference or analyze the radio data.
Please note that the output shown here is generated by a modified version of rtl_433.
$ rtl_433 -f 433964000 -R 42 -DD
Registering protocol [1] "HIDEKI TS04 Temperature, Humidity, Wind and Rain Sensor"
Registered 1 out of 95 device decoding protocols
Found 1 device(s)
trying device 0: Realtek, RTL2838UHIDIR, SN: 00000001
Found Rafael Micro R820T tuner
Using device 0: Generic RTL2832U OEM
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Sample rate set to 250000.
Bit detection level set to 0 (Auto).
Tuner gain set to Auto.
Reading samples in async mode...
Tuned to 433964000 Hz.
Pulses: 241, 231, 226, 102, 105, 104, 226, 106, 99, 104, 110, 104, 103, 103, 105, 228, 230, 105, 104, 106, 103, 103, 226, 225, 107, 226, 108, 106, 227, 106, 233, 107, 109, 104, 106, 229, 104, 108, 109, 108, 226, 226, 104, 107, 228, 104, 108, 109, 229, 104, 229, 231, 230, 229, 227, 105, 107, 226, 102, 227, 104, 105, 107, 104, 109, 107, 105,
Gaps: 257, 261, 143, 140, 261, 140, 139, 145, 139, 137, 259, 143, 141, 138, 140, 258, 138, 139, 141, 139, 265, 139, 264, 260, 139, 138, 258, 141, 259, 134, 136, 137, 139, 260, 137, 140, 138, 134, 137, 260, 264, 140, 137, 261, 260, 138, 135, 137, 261, 139, 257, 258, 259, 262, 138, 138, 262, 142, 263, 139, 138, 139, 261, 136, 136, 138, 2501,
device->name: HIDEKI TS04 Temperature, Humidity, Wind and Rain Sensor
device->short_limit: 130.000000
device->long_limit: 260.000000
n: 0 bitbuffer:: Number of rows: 1
[00] {1} 00 : 0
n: 1 bitbuffer:: Number of rows: 1
[00] {2} 00 : 00
n: 2 bitbuffer:: Number of rows: 1
[00] {3} 00 : 000
n: 3 bitbuffer:: Number of rows: 1
[00] {4} 00 : 0000
n: 4 bitbuffer:: Number of rows: 1
[00] {5} 00 : 00000
n: 6 bitbuffer:: Number of rows: 1
[00] {6} 04 : 000001
n: 8 bitbuffer:: Number of rows: 1
[00] {7} 06 : 0000011
n: 9 bitbuffer:: Number of rows: 1
[00] {8} 06 : 00000110
n: 11 bitbuffer:: Number of rows: 1
[00] {9} 06 80 : 00000110 1
n: 12 bitbuffer:: Number of rows: 1
[00] {10} 06 80 : 00000110 10
n: 14 bitbuffer:: Number of rows: 1
[00] {11} 06 a0 : 00000110 101
n: 16 bitbuffer:: Number of rows: 1
[00] {12} 06 b0 : 00000110 1011
n: 18 bitbuffer:: Number of rows: 1
[00] {13} 06 b8 : 00000110 10111
n: 20 bitbuffer:: Number of rows: 1
[00] {14} 06 bc : 00000110 101111
n: 21 bitbuffer:: Number of rows: 1
[00] {15} 06 bc : 00000110 1011110
n: 23 bitbuffer:: Number of rows: 1
[00] {16} 06 bd : 00000110 10111101
n: 25 bitbuffer:: Number of rows: 1
[00] {17} 06 bd 80 : 00000110 10111101 1
n: 27 bitbuffer:: Number of rows: 1
[00] {18} 06 bd c0 : 00000110 10111101 11
n: 29 bitbuffer:: Number of rows: 1
[00] {19} 06 bd e0 : 00000110 10111101 111
n: 30 bitbuffer:: Number of rows: 1
[00] {20} 06 bd e0 : 00000110 10111101 1110
n: 31 bitbuffer:: Number of rows: 1
[00] {21} 06 bd e0 : 00000110 10111101 11100
n: 32 bitbuffer:: Number of rows: 1
[00] {22} 06 bd e0 : 00000110 10111101 111000
n: 34 bitbuffer:: Number of rows: 1
[00] {23} 06 bd e2 : 00000110 10111101 1110001
n: 36 bitbuffer:: Number of rows: 1
[00] {24} 06 bd e3 : 00000110 10111101 11100011
n: 38 bitbuffer:: Number of rows: 1
[00] {25} 06 bd e3 80 : 00000110 10111101 11100011 1
n: 40 bitbuffer:: Number of rows: 1
[00] {26} 06 bd e3 c0 : 00000110 10111101 11100011 11
n: 41 bitbuffer:: Number of rows: 1
[00] {27} 06 bd e3 c0 : 00000110 10111101 11100011 110
n: 43 bitbuffer:: Number of rows: 1
[00] {28} 06 bd e3 d0 : 00000110 10111101 11100011 1101
n: 44 bitbuffer:: Number of rows: 1
[00] {29} 06 bd e3 d0 : 00000110 10111101 11100011 11010
n: 45 bitbuffer:: Number of rows: 1
[00] {30} 06 bd e3 d0 : 00000110 10111101 11100011 110100
n: 46 bitbuffer:: Number of rows: 1
[00] {31} 06 bd e3 d0 : 00000110 10111101 11100011 1101000
n: 47 bitbuffer:: Number of rows: 1
[00] {32} 06 bd e3 d0 : 00000110 10111101 11100011 11010000
n: 49 bitbuffer:: Number of rows: 1
[00] {33} 06 bd e3 d0 80 : 00000110 10111101 11100011 11010000 1
n: 50 bitbuffer:: Number of rows: 1
[00] {34} 06 bd e3 d0 80 : 00000110 10111101 11100011 11010000 10
n: 52 bitbuffer:: Number of rows: 1
[00] {35} 06 bd e3 d0 a0 : 00000110 10111101 11100011 11010000 101
n: 53 bitbuffer:: Number of rows: 1
[00] {36} 06 bd e3 d0 a0 : 00000110 10111101 11100011 11010000 1010
n: 55 bitbuffer:: Number of rows: 1
[00] {37} 06 bd e3 d0 a8 : 00000110 10111101 11100011 11010000 10101
n: 56 bitbuffer:: Number of rows: 1
[00] {38} 06 bd e3 d0 a8 : 00000110 10111101 11100011 11010000 101010
n: 57 bitbuffer:: Number of rows: 1
[00] {39} 06 bd e3 d0 a8 : 00000110 10111101 11100011 11010000 1010100
n: 59 bitbuffer:: Number of rows: 1
[00] {40} 06 bd e3 d0 a9 : 00000110 10111101 11100011 11010000 10101001
n: 60 bitbuffer:: Number of rows: 1
[00] {41} 06 bd e3 d0 a9 00 : 00000110 10111101 11100011 11010000 10101001 0
n: 62 bitbuffer:: Number of rows: 1
[00] {42} 06 bd e3 d0 a9 40 : 00000110 10111101 11100011 11010000 10101001 01
n: 64 bitbuffer:: Number of rows: 1
[00] {43} 06 bd e3 d0 a9 60 : 00000110 10111101 11100011 11010000 10101001 011
n: 66 bitbuffer:: Number of rows: 1
[00] {44} 06 bd e3 d0 a9 70 : 00000110 10111101 11100011 11010000 10101001 0111
n: 67 bitbuffer:: Number of rows: 1
[00] {45} 06 bd e3 d0 a9 70 : 00000110 10111101 11100011 11010000 10101001 01110
n: 69 bitbuffer:: Number of rows: 1
[00] {46} 06 bd e3 d0 a9 74 : 00000110 10111101 11100011 11010000 10101001 011101
n: 70 bitbuffer:: Number of rows: 1
[00] {47} 06 bd e3 d0 a9 74 : 00000110 10111101 11100011 11010000 10101001 0111010
n: 72 bitbuffer:: Number of rows: 1
[00] {48} 06 bd e3 d0 a9 75 : 00000110 10111101 11100011 11010000 10101001 01110101
n: 74 bitbuffer:: Number of rows: 1
[00] {49} 06 bd e3 d0 a9 75 80 : 00000110 10111101 11100011 11010000 10101001 01110101 1
n: 76 bitbuffer:: Number of rows: 1
[00] {50} 06 bd e3 d0 a9 75 c0 : 00000110 10111101 11100011 11010000 10101001 01110101 11
n: 78 bitbuffer:: Number of rows: 1
[00] {51} 06 bd e3 d0 a9 75 e0
n: 79 bitbuffer:: Number of rows: 1
[00] {52} 06 bd e3 d0 a9 75 e0
n: 80 bitbuffer:: Number of rows: 1
[00] {53} 06 bd e3 d0 a9 75 e0
n: 81 bitbuffer:: Number of rows: 1
[00] {54} 06 bd e3 d0 a9 75 e0
n: 82 bitbuffer:: Number of rows: 1
[00] {55} 06 bd e3 d0 a9 75 e0
n: 84 bitbuffer:: Number of rows: 1
[00] {56} 06 bd e3 d0 a9 75 e1
n: 86 bitbuffer:: Number of rows: 1
[00] {57} 06 bd e3 d0 a9 75 e1 80
n: 87 bitbuffer:: Number of rows: 1
[00] {58} 06 bd e3 d0 a9 75 e1 80
n: 88 bitbuffer:: Number of rows: 1
[00] {59} 06 bd e3 d0 a9 75 e1 80
n: 89 bitbuffer:: Number of rows: 1
[00] {60} 06 bd e3 d0 a9 75 e1 80
n: 91 bitbuffer:: Number of rows: 1
[00] {61} 06 bd e3 d0 a9 75 e1 88
n: 93 bitbuffer:: Number of rows: 1
[00] {62} 06 bd e3 d0 a9 75 e1 8c
n: 95 bitbuffer:: Number of rows: 1
[00] {63} 06 bd e3 d0 a9 75 e1 8e
n: 96 bitbuffer:: Number of rows: 1
[00] {64} 06 bd e3 d0 a9 75 e1 8e
n: 97 bitbuffer:: Number of rows: 1
[00] {65} 06 bd e3 d0 a9 75 e1 8e 00
n: 99 bitbuffer:: Number of rows: 1
[00] {66} 06 bd e3 d0 a9 75 e1 8e 40
n: 100 bitbuffer:: Number of rows: 1
[00] {67} 06 bd e3 d0 a9 75 e1 8e 40
n: 101 bitbuffer:: Number of rows: 1
[00] {68} 06 bd e3 d0 a9 75 e1 8e 40
n: 102 bitbuffer:: Number of rows: 1
[00] {69} 06 bd e3 d0 a9 75 e1 8e 40
n: 103 bitbuffer:: Number of rows: 1
[00] {70} 06 bd e3 d0 a9 75 e1 8e 40
n: 104 bitbuffer:: Number of rows: 1
[00] {71} 06 bd e3 d0 a9 75 e1 8e 40
n: 105 bitbuffer:: Number of rows: 1
[00] {72} 06 bd e3 d0 a9 75 e1 8e 40
n: 106 bitbuffer:: Number of rows: 1
[00] {73} 06 bd e3 d0 a9 75 e1 8e 40 00
n: 107 bitbuffer:: Number of rows: 1
[00] {74} 06 bd e3 d0 a9 75 e1 8e 40 00
n: 108 bitbuffer:: Number of rows: 1
[00] {75} 06 bd e3 d0 a9 75 e1 8e 40 00
n: 110 bitbuffer:: Number of rows: 1
[00] {76} 06 bd e3 d0 a9 75 e1 8e 40 10
n: 112 bitbuffer:: Number of rows: 1
[00] {77} 06 bd e3 d0 a9 75 e1 8e 40 18
n: 113 bitbuffer:: Number of rows: 1
[00] {78} 06 bd e3 d0 a9 75 e1 8e 40 18
n: 114 bitbuffer:: Number of rows: 1
[00] {79} 06 bd e3 d0 a9 75 e1 8e 40 18
n: 116 bitbuffer:: Number of rows: 1
[00] {80} 06 bd e3 d0 a9 75 e1 8e 40 19
n: 117 bitbuffer:: Number of rows: 1
[00] {81} 06 bd e3 d0 a9 75 e1 8e 40 19 00
n: 118 bitbuffer:: Number of rows: 1
[00] {82} 06 bd e3 d0 a9 75 e1 8e 40 19 00
n: 120 bitbuffer:: Number of rows: 1
[00] {83} 06 bd e3 d0 a9 75 e1 8e 40 19 20
n: 122 bitbuffer:: Number of rows: 1
[00] {84} 06 bd e3 d0 a9 75 e1 8e 40 19 30
n: 124 bitbuffer:: Number of rows: 1
[00] {85} 06 bd e3 d0 a9 75 e1 8e 40 19 38
n: 125 bitbuffer:: Number of rows: 1
[00] {86} 06 bd e3 d0 a9 75 e1 8e 40 19 38
n: 127 bitbuffer:: Number of rows: 1
[00] {87} 06 bd e3 d0 a9 75 e1 8e 40 19 3a
n: 129 bitbuffer:: Number of rows: 1
[00] {88} 06 bd e3 d0 a9 75 e1 8e 40 19 3b
n: 131 bitbuffer:: Number of rows: 1
[00] {89} 06 bd e3 d0 a9 75 e1 8e 40 19 3b 80
n: 132 bitbuffer:: Number of rows: 1
[00] {90} 06 bd e3 d0 a9 75 e1 8e 40 19 3b c0
bitbuffer:: Number of rows: 1
[00] {90} 06 bd e3 d0 a9 75 e1 8e 40 19 3b c0
Packet: 9f 21 0e 5e 16 c2 39 fb 67 11
2017-11-22 10:27:04 : HIDEKI TS04 sensor
Rolling Code: 1
Channel: 1
Battery: OK
Temperature: 21.6 C
Humidity: 39 %
pulse_demod_clock_bits(): HIDEKI TS04 Temperature, Humidity, Wind and Rain Sensor
bitbuffer:: Number of rows: 1
[00] {90} 06 bd e3 d0 a9 75 e1 8e 40 19 3b c0
n: 133 bitbuffer:: Number of rows: 0
Pulse data: 67 pulses
[ 0] Pulse: 241, Gap: 257, Period: 498 -> 00
[ 1] Pulse: 231, Gap: 261, Period: 492 -> 00
[ 2] Pulse: 226, Gap: 143, Period: 369 -> 0
[ 3] Pulse: 102, Gap: 140, Period: 242 -> 1
[ 4] Pulse: 105, Gap: 261, Period: 366 -> 10
[ 5] Pulse: 104, Gap: 140, Period: 244 -> 1
[ 6] Pulse: 226, Gap: 139, Period: 365 -> 0
[ 7] Pulse: 106, Gap: 145, Period: 251 -> 1
[ 8] Pulse: 99, Gap: 139, Period: 238 -> 1
[ 9] Pulse: 104, Gap: 137, Period: 241 -> 1
[ 10] Pulse: 110, Gap: 259, Period: 369 -> 10
[ 11] Pulse: 104, Gap: 143, Period: 247 -> 1 (0000.0110,1011.1101)
[ 12] Pulse: 103, Gap: 141, Period: 244
[ 13] Pulse: 103, Gap: 138, Period: 241
[ 14] Pulse: 105, Gap: 140, Period: 245
[ 15] Pulse: 228, Gap: 258, Period: 486
[ 16] Pulse: 230, Gap: 138, Period: 368
[ 17] Pulse: 105, Gap: 139, Period: 244
[ 18] Pulse: 104, Gap: 141, Period: 245
[ 19] Pulse: 106, Gap: 139, Period: 245
[ 20] Pulse: 103, Gap: 265, Period: 368
[ 21] Pulse: 103, Gap: 139, Period: 242
[ 22] Pulse: 226, Gap: 264, Period: 490
[ 23] Pulse: 225, Gap: 260, Period: 485
[ 24] Pulse: 107, Gap: 139, Period: 246
[ 25] Pulse: 226, Gap: 138, Period: 364
[ 26] Pulse: 108, Gap: 258, Period: 366
[ 27] Pulse: 106, Gap: 141, Period: 247
[ 28] Pulse: 227, Gap: 259, Period: 486
[ 29] Pulse: 106, Gap: 134, Period: 240
[ 30] Pulse: 233, Gap: 136, Period: 369
[ 31] Pulse: 107, Gap: 137, Period: 244
[ 32] Pulse: 109, Gap: 139, Period: 248
[ 33] Pulse: 104, Gap: 260, Period: 364
[ 34] Pulse: 106, Gap: 137, Period: 243
[ 35] Pulse: 229, Gap: 140, Period: 369
[ 36] Pulse: 104, Gap: 138, Period: 242
[ 37] Pulse: 108, Gap: 134, Period: 242
[ 38] Pulse: 109, Gap: 137, Period: 246
[ 39] Pulse: 108, Gap: 260, Period: 368
[ 40] Pulse: 226, Gap: 264, Period: 490
[ 41] Pulse: 226, Gap: 140, Period: 366
[ 42] Pulse: 104, Gap: 137, Period: 241
[ 43] Pulse: 107, Gap: 261, Period: 368
[ 44] Pulse: 228, Gap: 260, Period: 488
[ 45] Pulse: 104, Gap: 138, Period: 242
[ 46] Pulse: 108, Gap: 135, Period: 243
[ 47] Pulse: 109, Gap: 137, Period: 246
[ 48] Pulse: 229, Gap: 261, Period: 490
[ 49] Pulse: 104, Gap: 139, Period: 243
[ 50] Pulse: 229, Gap: 257, Period: 486
[ 51] Pulse: 231, Gap: 258, Period: 489
[ 52] Pulse: 230, Gap: 259, Period: 489
[ 53] Pulse: 229, Gap: 262, Period: 491
[ 54] Pulse: 227, Gap: 138, Period: 365
[ 55] Pulse: 105, Gap: 138, Period: 243
[ 56] Pulse: 107, Gap: 262, Period: 369
[ 57] Pulse: 226, Gap: 142, Period: 368
[ 58] Pulse: 102, Gap: 263, Period: 365
[ 59] Pulse: 227, Gap: 139, Period: 366
[ 60] Pulse: 104, Gap: 138, Period: 242
[ 61] Pulse: 105, Gap: 139, Period: 244
[ 62] Pulse: 107, Gap: 261, Period: 368
[ 63] Pulse: 104, Gap: 136, Period: 240
[ 64] Pulse: 109, Gap: 136, Period: 245
[ 65] Pulse: 107, Gap: 138, Period: 245
[ 66] Pulse: 105, Gap: 2501, Period: 2606
- rtlsdr_callback()
- Convert to magnitude and filter
- pulse_detect_package()
- pulse_demod_clock_bits()
- hideki_ts04_callback()