main.c
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/*
* Copyright (C) 2015 Ludwig Knüpfer, Christian Mehlis
* 2016 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief Test application for the dht humidity and temperature sensor driver
*
* @author Ludwig Knüpfer <ludwig.knuepfer@fu-berlin.de>
* @author Christian Mehlis <mehlis@inf.fu-berlin.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include <stdio.h>
#include "xtimer.h"
#include "dht.h"
#include "dht_params.h"
extern dht_t dht_devs[];
int main(void)
{
puts("DHT temperature and humidity sensor test application\n");
/* periodically read temp and humidity values */
while (1) {
for (unsigned i = 0; i < DHT_NUMOF; i++) {
dht_t *dev = &dht_devs[i];
int16_t temp, hum;
int16_t dec_temp, dec_hum, int_temp, int_hum;
if (dht_read(dev, &temp, &hum) == -1) {
puts("error reading data");
continue;
}
/* split up values into integral and fractional parts for nicer
* printing
* TODO: this should be done in some kind of library... */
int_temp = temp / 10;
dec_temp = temp - (int_temp * 10);
int_hum = hum / 10;
dec_hum = hum - (int_hum * 10);
printf("DHT device #%u - ", i);
printf("temp: %i.%i°C, ", int_temp, dec_temp);
printf("relative humidity: %i.%i%%\n", int_hum, dec_hum);
xtimer_usleep(2000 * MS_IN_USEC);
}
}
return 0;
}