mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-09-09 23:54:32 +00:00
89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
|
/*
|
||
|
* Copyright (c) 2016, Zolertia <http://www.zolertia.com>
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions
|
||
|
* are met:
|
||
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer.
|
||
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
* documentation and/or other materials provided with the distribution.
|
||
|
* 3. Neither the name of the Institute nor the names of its contributors
|
||
|
* may be used to endorse or promote products derived from this software
|
||
|
* without specific prior written permission.
|
||
|
*
|
||
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
||
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
||
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
* SUCH DAMAGE.
|
||
|
*
|
||
|
* This file is part of the Contiki operating system.
|
||
|
*
|
||
|
*/
|
||
|
/**
|
||
|
* \addtogroup zoul-examples
|
||
|
* @{
|
||
|
*
|
||
|
* \defgroup zoul-dht22-test DHT22 temperature and humidity sensor test
|
||
|
*
|
||
|
* Demonstrates the use of the DHT22 digital temperature and humidity sensor
|
||
|
* @{
|
||
|
*
|
||
|
* \file
|
||
|
* A quick program for testing the DHT22 temperature and humidity sensor
|
||
|
* \author
|
||
|
* Antonio Lignan <alinan@zolertia.com>
|
||
|
*/
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
#include <stdio.h>
|
||
|
#include "contiki.h"
|
||
|
#include "dev/dht22.h"
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
PROCESS(remote_dht22_process, "DHT22 test");
|
||
|
AUTOSTART_PROCESSES(&remote_dht22_process);
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
static struct etimer et;
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
PROCESS_THREAD(remote_dht22_process, ev, data)
|
||
|
{
|
||
|
int16_t temperature, humidity;
|
||
|
|
||
|
PROCESS_BEGIN();
|
||
|
SENSORS_ACTIVATE(dht22);
|
||
|
|
||
|
/* Let it spin and read sensor data */
|
||
|
|
||
|
while(1) {
|
||
|
etimer_set(&et, CLOCK_SECOND);
|
||
|
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
|
||
|
|
||
|
/* The standard sensor API may be used to read sensors individually, using
|
||
|
* the `dht22.value(DHT22_READ_TEMP)` and `dht22.value(DHT22_READ_HUM)`,
|
||
|
* however a single read operation (5ms) returns both values, so by using
|
||
|
* the function below we save one extra operation
|
||
|
*/
|
||
|
if(dht22_read_all(&temperature, &humidity) != DHT22_ERROR) {
|
||
|
printf("Temperature %02d.%02d ºC, ", temperature / 10, temperature % 10);
|
||
|
printf("Humidity %02d.%02d RH\n", humidity / 10, humidity % 10);
|
||
|
} else {
|
||
|
printf("Failed to read the sensor\n");
|
||
|
}
|
||
|
}
|
||
|
PROCESS_END();
|
||
|
}
|
||
|
/*---------------------------------------------------------------------------*/
|
||
|
/**
|
||
|
* @}
|
||
|
* @}
|
||
|
*/
|
||
|
|