DHT¶
About¶
Read and print the temperature and humidity measured with DHT sensor.
See the DHT sensor Library Reference for more details.
Source code¶
/*
* The MIT License (MIT)
*
* Copyright (c) 2017-2018, Erik Moqvist
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* This file is part of the Simba project.
*/
#include "simba.h"
int main()
{
int res;
struct dht_driver_t dht;
float temperature;
float humidty;
sys_start();
dht_module_init();
/* Initialize the DHT driver. */
dht_init(&dht, &pin_d2_dev);
while (1) {
thrd_sleep(2.5);
/* Read temperature and humidty from the device. */
res = dht_read(&dht, &temperature, &humidty);
if (res != 0) {
std_printf(OSTR("Read failed with %d: %S.\r\n"),
res,
errno_as_string(res));
continue;
}
/* Print the read temperature and humidty. */
std_printf(OSTR("Temperature: %f C\r\n"
"Humidty: %f %%RH\r\n"
"\r\n"),
temperature,
humidty);
}
return (0);
}
The source code can also be found on Github in the examples/dht folder.
Build and run¶
Build and run the application.
$ cd examples/dht
$ make -s BOARD=<board> run
Temperature: 22.5 C
Humidty: 68 %RH