Data format C5 (Cut-RAWv2)

Lifecycle: Beta. Last updated 2024-01-30

The data is decoded from "Manufacturer Specific Data" -field, for more details please check Bluetooth Advertisements section. Manufacturer ID is 0x0499 , which is transmitted as 0x9904 in raw data.

The format resembles original RAWv2, but acceleration is left out to leave 6 bytes for other information in primary advertisement.

The actual data payload is:

Offset	Allowed values	Description
0	0xC5	Data format (8bit)
1-2	-32767 ... 32767	Temperature in 0.005 degrees
3-4	0 ... 40 000	Humidity (16bit unsigned) in 0.0025% (0-163.83% range, though realistically 0-100%)
5-6	0 ... 65534	Pressure (16bit unsigned) in 1 Pa units, with offset of -50 000 Pa
7-8	0 ... 2046, 0 ... 30	Power info (11+5bit unsigned), first 11 bits is the battery voltage above 1.6V, in millivolts (1.6V to 3.646V range). Last 5 bits unsigned are the TX power above -40dBm, in 2dBm steps. (-40dBm to +20dBm range)
9	0 ... 254	Movement counter (8 bit unsigned), incremented by motion detection interrupts from accelerometer
10-11	0 ... 65534	Measurement sequence number (16 bit unsigned), each time a measurement is taken, this is incremented by one, used for measurement de-duplication. Depending on the transmit interval, multiple packets with the same measurements can be sent, and there may be measurements that never were sent.
12-17	Any valid mac	48bit MAC address.

Not available is signified by largest presentable number for unsigned values, smallest presentable number for signed values and all bits set for mac. All fields are MSB first 2-complement, i.e. 0xFC18 is read as -1000 and 0x03E8 is read as 1000. If original data overflows the data format, data is clipped to closests value that can be represented. For example temperature 170.00 C becomes 163.835 C and acceleration -40.000 G becomes -32.767 G.

Data field descriptions

Temperature

Values supported: (-163.835 °C to +163.835 °C in 0.005 °C increments.

Example

Value	Measurement
0x0000	0 °C
0x01C3	+2.255 °C
0xFE3D	-2.255 °C
0x8000	Invalid / not available

Humidity

Values supported: 0.0 % to 100 % in 0.0025 % increments. Higher values than 100 % are possible, but they generally indicate a faulty or miscalibrated sensor.

Example

Value	Measurement
000	0%
10010	25.025%
40000	100.0%
65535	Invalid / not available

Atmospheric Pressure

Values supported: 50000 Pa to 115536 Pa in 1 Pa increments.

Example

Value	Measurement
00000	50000 Pa
51325	101325 Pa (average sea-level pressure)
65534	115534 Pa
65535	Invalid / not available

Battery voltage

Values supported: 1600 mV to 3647 mV in 1 mV increments, practically 1800 ... 3600 mV.

Example

Value	Measurement
0000	1600 mV
1400	3000 mV
2047	Invalid / not available

Tx Power

Values supported: -40 dBm to +22 dBm in 2 dBm increments.

Example

Value	Measurement
00	-40 dBm
22	+4 dBm
31	Invalid / not available

Movement counter

Movement counter is one-byte counter which gets triggered when LIS2DH12 gives "activity interrupt". Sensitivity depends on the firmware, by default the sensitivity is a movement over 64 mG. The counter will roll over. Movement is deduced by "rate of change". Please note that the highest valid value is 254, and 255 is reserved for the "not available".

Example

Value	Measurement
00	0 counts
100	100 counts
255	Invalid / not available

Measurement sequence number

Mesurement sequence number gets incremented by one for every measurement. It can be used to gauge signal quality and packet loss as well as to deduplicated data entries. You should note that the measurement sequence refers to data rather than transmission, so you might receive many transmissions with the same measurement sequence number. Please note that the highest valid value is 65534, and 65535 is reserved for the "not available".

Example

Value	Measurement
00	0 counts
1000	1000 counts
65535	Invalid / not available

Test vectors

These test vectors are based on ruuvitag-sensor project. The tests are bidirectional, decode-encode results in original raw data. Encode-decode must result in same values with given precision, but floating point rounding differences may occur.

Case: valid data

Raw binary data: 0x0512FC5394C37CAC364200CDCBB8334C884F

Field	Value
Data format	5
Temperature	24.3 C
Pressure	100044
Humidity	53.49 RH-%
TX Power	4 dBm
Voltage	2.977 V
Movement counter	66
Measurement Sequence	205
MAC	CB B8 33 4C 88 4F

Case: maximum values

Raw binary data: 0x057FFFFFFEFFFEFFDEFEFFFECBB8334C884F

Field	Value
Data format	5
Temperature	163.835 C
Pressure	115534
Humidity	163.8350 RH-%
TX Power	20 dBm
Voltage	3.646 V
Movement counter	254
Measurement Sequence	65534
MAC	CB B8 33 4C 88 4F

Case: minimum values

Raw binary data: 0x058001000000000000000000CBB8334C884F

Field	Value
Data format	5
Temperature	-163.835 C
Pressure	50000
Humidity	0.000 RH-%
TX Power	-40 dBm
Voltage	1.600 V
Movement counter	0
Measurement Sequence	0
MAC	CB B8 33 4C 88 4F

Case: Invalid values

Raw binary data: 0x058000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

Field	Value
Data format	5
Temperature	NAN
Pressure	NAN
Humidity	NAN
TX Power	NAN
Voltage	NAN
Movement counter	NAN
Measurement Sequence	NAN
MAC	NAN