contiki/examples/ipv6/slip-radio/slip-radio-sky-sensors.c

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/*
* Copyright (c) 2011, 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.
*/
#include "contiki.h"
#include "lib/sensors.h"
#include "dev/sht11/sht11-sensor.h"
#include "slip-radio.h"
#include "cmd.h"
#include <stdio.h>
/*---------------------------------------------------------------------------*/
static void
init(void)
{
}
/*---------------------------------------------------------------------------*/
static int
write_percent_float(char *data, int maxlen, int temp)
{
int t;
t = temp % 100;
if(t < 0) {
t = -t;
}
return snprintf(data, maxlen, "%d.%02d", temp / 100, t);
}
/*---------------------------------------------------------------------------*/
static void
send(void)
{
#define MAX_SIZE 40
char data[MAX_SIZE];
int temperature;
int ms;
long hum;
int pos = 0;
/* SENSORS_ACTIVATE(light_sensor); */
SENSORS_ACTIVATE(sht11_sensor);
pos += snprintf(data, MAX_SIZE, "!D");
/* int light1 = light_sensor.value(LIGHT_SENSOR_PHOTOSYNTHETIC); */
/* int light2 = light_sensor.value(LIGHT_SENSOR_TOTAL_SOLAR); */
temperature = -3970 + sht11_sensor.value(SHT11_SENSOR_TEMP);
ms = sht11_sensor.value(SHT11_SENSOR_HUMIDITY);
/* this is in * 10000 */
/* -2.0468 + 0.0367 * ms + -1.5955e-6 * ms * ms ...too small value... */
hum = (-20468L + 367L * ms) / 100L;
/* SENSORS_DEACTIVATE(light_sensor); */
SENSORS_DEACTIVATE(sht11_sensor);
pos += snprintf(&data[pos], MAX_SIZE - pos, "temp=");
pos += write_percent_float(&data[pos], MAX_SIZE - pos, temperature);
pos += snprintf(&data[pos], MAX_SIZE - pos, ";hum=");
pos += write_percent_float(&data[pos], MAX_SIZE - pos, hum);
cmd_send((uint8_t *)data, pos);
}
/* ---------------------------------------------------------------------- */
const struct slip_radio_sensors slip_radio_sky_sensors = {
init, send
};
/* ---------------------------------------------------------------------- */