test-sht11.c

Go to the documentation of this file.

/*
 * Copyright (c) 2007, Swedish Institute of Computer Science.
 * 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.
 *
 * $Id: test-sht11.c,v 1.2 2007/10/22 13:07:00 nvt-se Exp $
 */

/**
 * \file
 *         Testing the SHT11 sensor.
 * \author
 *         Nicolas Tsiftes <nvt@sics.se>
 */

#include "contiki.h"
#include "dev/sht11.h"

#include <stdio.h>

PROCESS(test_sht11_process, "SHT11 test");
AUTOSTART_PROCESSES(&test_sht11_process);

PROCESS_THREAD(test_sht11_process, ev, data)
{
  static struct etimer et;
  static unsigned rh;

  PROCESS_BEGIN();

  for (etimer_set(&et, CLOCK_SECOND);; etimer_reset(&et)) {
    PROCESS_YIELD();
    printf("Temperature:   %u degrees Celsius\n",
        (unsigned) (-39.60 + 0.01 * sht11_temp()));
    rh = sht11_humidity();
    printf("Rel. humidity: %u%%\n",
        (unsigned) (-4 + 0.0405*rh - 2.8e-6*(rh*rh)));
  }

  PROCESS_END();
}