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dht.h
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1/*
2 * Copyright 2015 Ludwig Knüpfer,
3 * 2015 Christian Mehlis
4 * 2016-2017 Freie Universität Berlin
5 *
6 * This file is subject to the terms and conditions of the GNU Lesser
7 * General Public License v2.1. See the file LICENSE in the top level
8 * directory for more details.
9 */
10
31#ifndef DHT_H
32#define DHT_H
33
34#include <errno.h>
35#include <stdint.h>
36
37#include "periph/gpio.h"
38
39#ifdef __cplusplus
40extern "C" {
41#endif
42
48enum {
49 DHT_OK = 0,
52};
53
57typedef struct {
58 uint16_t humidity;
59 uint16_t temperature;
61
73
83
91
107int dht_init(dht_t *dev, const dht_params_t *params);
108
129int dht_read(dht_t *dev, int16_t *temp, int16_t *hum);
130
131#ifdef __cplusplus
132}
133#endif
134
135#endif /* DHT_H */
Low-level GPIO peripheral driver interface definitions.
#define ETIMEDOUT
Connection timed out.
Definition errno.h:147
#define EIO
I/O error.
Definition errno.h:98
dht_type_t
Device type of the DHT device.
Definition dht.h:65
int dht_read(dht_t *dev, int16_t *temp, int16_t *hum)
get a new temperature and humidity value from the device
int dht_init(dht_t *dev, const dht_params_t *params)
Initialize a new DHT device.
@ DHT_NOCSUM
checksum error
Definition dht.h:50
@ DHT_TIMEOUT
communication timed out
Definition dht.h:51
@ DHT_OK
all good
Definition dht.h:49
@ DHT11_2022
New DHT11 variant with 0.01 °C resolution.
Definition dht.h:68
@ DHT21
DHT21 device identifier.
Definition dht.h:70
@ DHT22
DHT22 device identifier.
Definition dht.h:69
@ DHT11
Older DHT11 variants with either 1 °C or 0.1 °C resolution.
Definition dht.h:66
@ AM2301
AM2301 device identifier.
Definition dht.h:71
gpio_mode_t
Available pin modes.
Definition periph_cpu.h:82
Data type for storing DHT sensor readings.
Definition dht.h:57
uint16_t humidity
relative humidity in deci-percent
Definition dht.h:58
uint16_t temperature
temperature in deci-Celsius
Definition dht.h:59
Configuration parameters for DHT devices.
Definition dht.h:77
gpio_mode_t in_mode
input pin configuration, with or without pull resistor
Definition dht.h:80
gpio_t pin
GPIO pin of the device's data pin.
Definition dht.h:78
dht_type_t type
type of the DHT device
Definition dht.h:79
Device descriptor for DHT sensor devices.
Definition dht.h:87
dht_params_t params
Device parameters.
Definition dht.h:88
dht_data_t last_val
Values of the last measurement.
Definition dht.h:89