Library of Temperature/Humidity Sensor from Silicon Labs for LPC1768 Editing from SILABS_RHT library
Dependents: F-CubeSatKit4 Xbee-Smart-Home-Inside TBSense2_Sensor_Demo TempHuminitysensor ... more
Diff: Si7021.h
- Revision:
- 0:d3514bc63a39
diff -r 000000000000 -r d3514bc63a39 Si7021.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Si7021.h Fri Jan 22 08:56:27 2016 +0000 @@ -0,0 +1,72 @@ +#ifndef SI7021_H +#define SI7021_H + +#include "mbed.h" + +/** Si7012 Read Temperature Command */ +#define READ_TEMP 0xE0 /* Read previous T data from RH measurement command*/ +/** Si7012 Read RH Command */ +#define READ_RH 0xE5 /* Perform RH (and T) measurement. */ + +/** Si7012 Read ID */ +#define READ_ID1_1 0xFA +#define READ_ID1_2 0x0F +#define READ_ID2_1 0xFC +#define READ_ID2_2 0xC9 + +/** Si7012 Read Firmware Revision */ +#define READ_FWREV_1 0x84 +#define READ_FWREV_2 0xB8 + +/** I2C device address for Si7021 */ +#define ADDR 0x80 + +/** I2C device frequency for Si7021 */ +#define FREQ 100000 + +/** Device ID value for Si7021 */ +#define DEVICE_ID 0x15 + +class Si7021 +{ +public: + Si7021(PinName sda, PinName scl); + ~Si7021(); + + /* + * Get last measured temperature data + * return: int32_t = temperature in millidegrees centigrade + */ + int32_t get_temperature(); + + /* + * Get last measured relative humidity data + * return: uint32_t = relative humidity value in milli-percent + */ + uint32_t get_humidity(); + + /* + * Perform measurement. + * Asynchronous callback can be provided (type void (*)(void)). + * return: 0 if successful, else one of the defined error codes. + */ + bool measure(); + + /* + * Check if the sensor is active and responding. This will update the get_active value. + * Asynchronous callback can be provided (type void (*)(void)). + * return: 0 if successful, else one of the defined error codes. + */ + bool check(); + +private: + I2C i2c; + + uint8_t rx_buff[8]; + uint8_t tx_buff[2]; + + uint32_t rhData; + int32_t tData; +}; + +#endif \ No newline at end of file