DHT Sensor API
DHT Temperature and Humidity sensor library optimized for GSM module.
Header File
Source: include/driver/dht.h
#include <driver/dht.h>
Functions
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int dht_read11(int iohandle, double *humidity, double *temperature)
DHT11 Read function
- Parameters:
iohandle – [in] GPIO pin handle returned by gpio_request()
humidity – [out] Humidity value
temperature – [out] Temperature value
- Returns:
DHT error code dht_err_e
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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 also
- Parameters:
iohandle – [in] GPIO pin handle gpio_request()
humidity – [out] Humidity value
temperature – [out] Temperature value
- Returns:
DHT error code dht_err_e
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
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dht_read21(p, h, t)
DHT21 read
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dht_read22(p, h, t)
DHT22 read
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dht_read33(p, h, t)
DHT33 read
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dht_read44(p, h, t)
DHT44 read
Enumerations
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enum dht_err_e
DHT err codes
Values:
-
enumerator DHTLIB_OK
DHT Read ok
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enumerator DHTLIB_ERROR_CHECKSUM
Checksum error
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enumerator DHTLIB_ERROR_TIMEOUT
DHT read timeout
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enumerator DHTLIB_ERROR_CONNECT
DHT connection error
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enumerator DHTLIB_ERROR_ACK_L
DHT ACK signal low error (check connection)
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enumerator DHTLIB_ERROR_ACK_H
DHT ACK signal high error (check connection)
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enumerator DHTLIB_OK