Helios-P Pressure Sensor Payload Description

Payload Description

Bytes: 1-2
Alias: Module Key
Name: module_key
Valid for versions: All – Base payload, valid and available for all sensors in the Febris series

Description:

Byte 1

• 4 bits MSB: Module code. For Mioty, only the "Sentiface" telemetry module, i.e., always 0x1.
• 4-bit LSB: Major version. Firmware with the same major version but a higher minor version remains compatible with older decoders. However, the number of bytes may change.

Byte 2

• 4 MSB bits: Minor version. New software versions can gradually add new telemetry to the data packet.
• 4 LSB bits: Sub-/product version. In Helios, these bits encode the specific configuration of the connected sensors.

Byte: 3
Alias: Uplink Counter
Name: uplink_counter
Valid for versions: All – Base payload, valid and available for all sensors in the Febris series
Description: Protocol-independent uplink counter that reaches a maximum value of 255. After that, the counter resets to 0.

Bytes: 4-5
Alias: Battery Voltage
Name: internal_temperature
Valid for versions: All – Base payload, valid and available for all sensors in the Febris series
Description: Current battery voltage in millivolts

battery_voltage = (dataBytes[3] << 8 | dataBytes[4]) / 1000.0

Byte: 6
Alias: Internal Temperature
Name: battery_voltage
Valid for versions: All - Base payload, valid and available for all sensors in the Febris series
Description: Internal temperature of the sensor + 128

internal_temperature = dataBytes[5] - 128

Byte: 7
Alias: Relative Humidity
Description: humidity
Valid for versions: All – Base payload, valid and available for all sensors in the Febris series
Description: Relative humidity in %

Byte: 9-10
Alias: Dew Point
Description: dewpoint
Valid for versions: All - Base payload, valid and available for all sensors in the Febris series
Description: Dew point in °C

Bytes: 11-12
Alias: atmospheric pressure
Description: pressure
Valid for versions: S-FEBR-XXXX-CO2-XXX
Description: Atmospheric pressure in hPa

Bytes: 13-14
Alias: CO2
Label: co2_ppm
Valid for versions: S-FEBR-XXXX-CO2-XXX
Description: CO2 value in ppm

Byte: 15
Alias: Alarm
Label: alarm
Valid for versions: S-FEBR-XXXX-CO2-XXX

Description:

• 0: 0–1000 ppm (green)
• 1: 1000–2000 ppm (yellow)
• 2: 2000–5000 ppm (red)

Similar to traffic lights; thresholds are adjustable.

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