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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2014 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.
*/
#pragma once
#include <string>
#include <iostream>
#include <stdint.h>
#include <sys/time.h>
#include <mraa/aio.h>
// default ADC resolution.
#define TA12200_ADC_RES 1024
namespace upm {
/**
* @brief TA12-200 Current Transformer library
* @defgroup ta12200 libupm-ta12200
* @ingroup seeed analog electric
*/
/**
* @library ta12200
* @sensor ta12200
* @comname TA12-200 Current Transformer
* @altname Grove Electricity Sensor
* @type electric
* @man seeed
* @web http://www.seeedstudio.com/wiki/Grove_-_Electricity_Sensor
* @con analog
*
* @brief API for the TA12-200 Current Transformer
*
* UPM module for the TA12-200 current transformer found,
* for instance, in the Grove Electricity Sensor.
* This module can measure AC moving through a wire at up
* to 5 A.
*
* @image html ta12200.jpg
* @snippet ta12200.cxx Interesting
*/
class TA12200 {
public:
/**
* TA12200 constructor
*
* @param pin Analog pin to use
*/
TA12200(int pin);
/**
* TA12200 destructor
*/
~TA12200();
/**
* Returns the number of milliseconds elapsed since initClock()
* was last called.
*
* @return Elapsed milliseconds
*/
uint32_t getMillis();
/**
* Resets the clock
*
*/
void initClock();
/**
* Gets the conversion value from the sensor
*
* @return Highest value obtained over 1 second of measuring
*/
unsigned int highestValue();
/**
* Computes the measured voltage
*
* @param val Value measured by highestValue()
* @param res ADC resolution
*
* @return Measured current in mA
*/
float milliAmps(unsigned int val, int res=TA12200_ADC_RES);
private:
struct timeval m_startTime;
mraa_aio_context m_aio;
};
}
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