Barometers

Github Repo	C Header	C source	JS source
mongoose-os-libs/barometer	mgos_barometer.h

Introduction

This library provides a simple API that describes barometer sensors. It implements various popular I2C and SPI barometers behind that API. Callers of the library can rely on the API returning consistently typed data regardless of the choice of sensor.

Primitives

(work in progress)

Disclaimer

This project is not an official Google project. It is not supported by Google and Google specifically disclaims all warranties as to its quality, merchantability, or fitness for a particular purpose.

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_read

uint32_t read;                 // calls to _read()
  uint32_t read_success;         // successful _read()
  uint32_t read_success_cached;  // calls to _read() which were cached
  // Note: read_errors := read - read_success - read_success_cached
  double   read_success_usecs;   // time spent in successful uncached _read()
};

value of mg_time() upon last call to _read()

mgos_barometer_set_cache_ttl

bool mgos_barometer_set_cache_ttl(struct mgos_barometer *sensor, uint16_t msecs);

Set cache TTL -- will limit reads and return cached data. Set msecs=0 to turn off

mgos_barometer_read

bool mgos_barometer_read(struct mgos_barometer *sensor);

Read all available sensor data from the barometer

mgos_barometer_get_pressure

bool mgos_barometer_get_pressure(struct mgos_barometer *sensor, float *p);

Return barometer data in units of Pascals

mgos_barometer_get_temperature

bool mgos_barometer_get_temperature(struct mgos_barometer *sensor, float *t);

Return temperature data in units of Celsius

mgos_barometer_get_humidity

bool mgos_barometer_get_humidity(struct mgos_barometer *sensor, float *h);

Return humidity data in units of % Relative Humidity

mgos_barometer_get_name

const char *mgos_barometer_get_name(struct mgos_barometer *sensor);

String representation of the barometer type, guaranteed to be 10 characters or less.

mgos_barometer_get_stats

bool mgos_barometer_get_stats(struct mgos_barometer *sensor, struct mgos_barometer_stats *stats);

Return statistics on the sensor.

mgos_barometer_init

bool mgos_barometer_init(void);

Initialization function for MGOS -- currently a noop.

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