nrfcxx::sensor Namespace Reference

Namespace for abstractions of various sensors. More...

Namespaces
	adc
	Specializations of nrfcxx::periph::ADC for common ADC operations.

Data Structures
struct	battery_level_point_type
	A point in a battery discharge curve sequence. More...
class	bme280
	Abstraction around BME280 temperature/humidity/pressure sensor. More...
class	Button
	Class that supports button state and timing events. More...
class	ccs811
	Interface to the ams CCS811 indoor air quality sensor. More...
class	contact
	State and functionality related to monitoring dry contacts. More...
class	hts221
	Interface to the ST HTS221 capacitive digital sensor for relative humidity and temperature. More...
class	lps22hb
	Interface to the ST LPS22HB piezzoresistave absolute pressure sensor. More...
class	sdp8xx
	Abstraction around SDP8xx differential pressure sensor. More...
class	sht21
	Abstraction around SHT21/HTU21D temperature/humidity sensor. More...

Functions
int	temperature_cK_cCel (int t_cK)
	Convert a temperature from cK to cCel. More...
unsigned int	battery_level_pptt (unsigned int batt_mV, const battery_level_point_type *curve)
	Calculate the estimated battery level based on a measured voltage. More...

Detailed Description

Namespace for abstractions of various sensors.

Function Documentation

battery_level_pptt()

unsigned int nrfcxx::sensor::battery_level_pptt	(	unsigned int	batt_mV,
		const battery_level_point_type *	curve
	)

Calculate the estimated battery level based on a measured voltage.

Parameters

batt_mV	a measured battery voltage level.
curve	the discharge curve for the type of battery installed on the system.

Returns

the estimated remaining capacity in parts per ten thousand.

temperature_cK_cCel()

int nrfcxx::sensor::temperature_cK_cCel ( int  t_cK )

inline

Convert a temperature from cK to cCel.

The core sensor interfaces return temperatures in scaled Kelvin because we know those values will always be non-negative and so can use a negative value to indicate a sensor error. Nonetheless few sensor applications are going to want to deal with Kelvin, and applications shouldn't have to remember that 273.15 Cel is 0 K. This does the math to convert the common scaled temperature value.

Parameters

t_cK	a non-negative temperature measured in hundredths Kelvin.

Returns

the same temperature measured in hundredths Celsius.