Module hdc1080 

Texas Instruments HDC1080 low-power humidity and temperature sensor.

The HDC1080 returns each measurement as a plain 16-bit fraction of full scale: the temperature register spans -40 to +125 °C and the humidity register 0 to 100 %RH, both linearly over the 16-bit code. There is no per-chip calibration to apply and no checksum on the frame, so the decode is the datasheet’s two equations, done here in integer arithmetic so a node without floating point reads exact millidegrees and milli-percent.

A caller writes a Configuration to the configuration register once, triggers an acquisition by writing the temperature pointer, waits the resolution’s conversion time, and reads the four-byte frame into a Measurement.

Modules

register

The HDC1080 register addresses. Every register is 16 bits, sent MSB first.

Structs

Configuration

The configuration register (0x02), field by field.

Measurement

One combined temperature and humidity result, as read in a single transaction after a trigger in AcquisitionMode::TemperatureThenHumidity.

Enums

AcquisitionMode

The MODE field: what one trigger acquires.

HumidityResolution

The HRES field: humidity measurement resolution.

TemperatureResolution

The TRES field: temperature measurement resolution.

Constants

CONFIGURATION_RESET

The power-on value of the configuration register: acquisition mode set to temperature then humidity, 14-bit resolution on both, heater off.

DEVICE_ID

The value the device-id register (0xFF) returns for an HDC1080.

I2C_ADDRESS

The fixed 7-bit I2C address, 1000000.

MANUFACTURER_ID

The value the manufacturer-id register (0xFE) returns: Texas Instruments.

Functions

celsius

Decodes the temperature register to degrees Celsius.

humidity_register

Builds the humidity register the sensor reports for a relative humidity.

milli_celsius

Decodes the temperature register to millidegrees Celsius.

milli_percent

Decodes the humidity register to thousandths of a percent relative humidity.

relative_humidity

Decodes the humidity register to percent relative humidity.

serial_id

Assembles the serial number from its three registers.

serial_id_registers

Splits a serial number into the three registers a sensor reports it in.

temperature_register

Builds the temperature register the sensor reports for a temperature.