dht: Driver for DHT11, AM2301 (DHT21, DHT22, AM2302, AM2321), Itead Si7021

Enums

enum dht_sensor_type_t

Sensor type.

Values:

enumerator DHT_TYPE_DHT11

DHT11.

enumerator DHT_TYPE_AM2301

AM2301 (DHT21, DHT22, AM2302, AM2321)

enumerator DHT_TYPE_SI7021

Itead Si7021.

Functions

esp_err_t dht_read_data(dht_sensor_type_t sensor_type, gpio_num_t pin, int16_t *humidity, int16_t *temperature)

Read integer data from sensor on specified pin.

Humidity and temperature are returned as integers. For example: humidity=625 is 62.5 %, temperature=244 is 24.4 degrees Celsius

Parameters:

  • sensor_type – DHT11 or DHT22

  • pin – GPIO pin connected to sensor OUT

  • humidity – [out] Humidity, percents * 10, nullable

  • temperature – [out] Temperature, degrees Celsius * 10, nullable

Returns:

ESP_OK on success

esp_err_t dht_read_float_data(dht_sensor_type_t sensor_type, gpio_num_t pin, float *humidity, float *temperature)

Read float data from sensor on specified pin.

Humidity and temperature are returned as floats.

Parameters:

  • sensor_type – DHT11 or DHT22

  • pin – GPIO pin connected to sensor OUT

  • humidity – [out] Humidity, percents, nullable

  • temperature – [out] Temperature, degrees Celsius, nullable

Returns:

ESP_OK on success