DHT Sensor API

DHT Temperature and Humidity sensor library optimized for GSM module.

Header File

Functions

int dht_read11(int iohandle, double *humidity, double *temperature)

DHT11 Read function

Return

DHT error code dht_err_e

Parameters

  • iohandle: [in] GPIO pin handle returned by gpio_request()

  • humidity: [out] Humidity value

  • temperature: [out] Temperature value

int dht_read(int iohandle, double *humidity, double *temperature)

DHTXX Read function where XX is 21,22,33,44 A macro based shorthand is also available for code readability.

See

dht_read21

See

dht_read22

See

dht_read33

See

dht_read44

Return

DHT error code dht_err_e

Parameters

  • iohandle: [in] GPIO pin handle gpio_request()

  • humidity: [out] Humidity value

  • temperature: [out] Temperature value

Macros

DHT_LIB_VERSION

DHT Temperature & Humidity Sensor library optimized for GSM module

DHT Library based on Rob Tillaart’s DHTlib ref: https://github.com/RobTillaart/Arduino/tree/master/libraries/DHTlib version: 0.1.29

dht_read21(p, h, t)

DHT21 read

dht_read22(p, h, t)

DHT22 read

dht_read33(p, h, t)

DHT33 read

dht_read44(p, h, t)

DHT44 read

Enumerations

enum dht_err_e

DHT err codes

Values:

enumerator DHTLIB_OK

DHT Read ok

enumerator DHTLIB_ERROR_CHECKSUM = -1

Checksum error

enumerator DHTLIB_ERROR_TIMEOUT = -2

DHT read timeout

enumerator DHTLIB_ERROR_CONNECT = -3

DHT connection error

enumerator DHTLIB_ERROR_ACK_L = -4

DHT ACK signal low error (check connection)

enumerator DHTLIB_ERROR_ACK_H = -5

DHT ACK signal high error (check connection)