mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-11-08 23:08:29 +00:00
119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2011, Zolertia(TM) is a trademark of Advancare,SL
|
|
* 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.
|
|
*
|
|
*
|
|
* \file
|
|
* Dummy light-sensor to allow as many programs for sky to compile for Z1
|
|
*
|
|
* \author
|
|
* Enric M. Calvo <ecalvo@zolertia.com>, adapted from previous work
|
|
*
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include "contiki.h"
|
|
#include "dev/light.h"
|
|
|
|
/*
|
|
* Initialize periodic readings from the 2 photo diodes. The most
|
|
* recent readings will be stored in ADC internal registers/memory.
|
|
*/
|
|
void
|
|
sensors_light_init(void)
|
|
{
|
|
}
|
|
|
|
/* Photosynthetically Active Radiation. */
|
|
unsigned
|
|
sensors_light1(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/* Total Solar Radiation. */
|
|
unsigned
|
|
sensors_light2(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Most of this information taken from
|
|
* http://www.moteiv.com/community/Getting_Data_from_Tmote_Sky%27s_Sensors
|
|
*
|
|
* The Photosynthetically Active Radiation (PAR) sensor as well as the
|
|
* Total Solar Radiation (TSR) sensor uses the 2.5V reference voltage
|
|
* to produce the raw ADC value.
|
|
|
|
* The voltage across each sensor is:
|
|
*
|
|
* VsensorPAR = ADCValuePAR/4096 * Vref (1a)
|
|
* VsensorTSR = ADCValueTSR/4096 * Vref (1b)
|
|
* where Vref = 2.5V
|
|
*
|
|
* This voltage creates a current through a resistor R=100KOhm and this
|
|
* current has a linear relationship with the light intensity in Lux.
|
|
* IPAR = VsensorPAR / 100,000 (2a)
|
|
* ITSR = VsensorTSR / 100,000 (2b)
|
|
*
|
|
* S1087 (PAR) lx = 1e6 * IPAR * 1000 (3a)
|
|
* S1087-01 (TSR) lx = 1e5 * ITSR * 1000 (3b)
|
|
*
|
|
* lxPAR = 10e9 * ADCValuePAR *(1/4096)* Vref * 10e-5 or
|
|
* lxPAR = 3125* ADCvaluePAR / 512
|
|
* and
|
|
* lxTSR = 10e8 * ADCValueTSR *(1/4096)* Vref * 10e-5 or
|
|
* lxTSR = 625* ADCvalueTSR / 1024
|
|
*/
|
|
|
|
#if 0
|
|
/* Photosynthetically Active Radiation in Lux units. */
|
|
unsigned
|
|
sensors_light1_lux(void)
|
|
{
|
|
unsigned temp;
|
|
temp = (uint32_t)ADC12MEM0;
|
|
|
|
temp = (temp*3125)>> 9;
|
|
return (uint16_t)(temp & 0xFFFF);
|
|
}
|
|
|
|
/* Total Solar Radiation in Lux units. */
|
|
unsigned
|
|
sensors_light2_lux(void)
|
|
{
|
|
unsigned temp;
|
|
temp = (uint32_t)ADC12MEM1;
|
|
|
|
temp = (temp*625)>> 10;
|
|
return (uint16_t)(temp & 0xFFFF);
|
|
}
|
|
#endif
|