64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
/*
|
|
* Authors: Brendan Le Foll <brendan.le.foll@intel.com>
|
|
* Mihai Tudor Panu <mihai.tudor.panu@intel.com>
|
|
* Sarah Knepper <sarah.knepper@intel.com>
|
|
* Copyright (c) 2014 - 2016 Intel Corporation.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <stdexcept>
|
|
|
|
#include "grovelight.hpp"
|
|
#include "math.h"
|
|
|
|
using namespace upm;
|
|
|
|
GroveLight::GroveLight(unsigned int pin)
|
|
{
|
|
if ( !(m_aio = mraa_aio_init(pin)) ) {
|
|
throw std::invalid_argument(std::string(__FUNCTION__) +
|
|
": mraa_aio_init() failed, invalid pin?");
|
|
return;
|
|
}
|
|
m_name = "Light Sensor";
|
|
}
|
|
|
|
GroveLight::~GroveLight()
|
|
{
|
|
mraa_aio_close(m_aio);
|
|
}
|
|
|
|
int GroveLight::value()
|
|
{
|
|
// rough conversion to lux, using formula from Grove Starter Kit booklet
|
|
float a = (float) mraa_aio_read(m_aio);
|
|
if (a == -1.0) return -1;
|
|
a = 10000.0/pow(((1023.0-a)*10.0/a)*15.0,4.0/3.0);
|
|
return (int) round(a);
|
|
}
|
|
|
|
float GroveLight::raw_value()
|
|
{
|
|
return (float) mraa_aio_read(m_aio);
|
|
}
|