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113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <string>
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#include <iostream>
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#include <stdint.h>
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#include <sys/time.h>
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#include <mraa/aio.h>
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// default ADC resolution.
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#define TA12200_ADC_RES 1024
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namespace upm {
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/**
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* @brief TA12-200 Current Transformer library
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* @defgroup ta12200 libupm-ta12200
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* @ingroup seeed analog electric
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*/
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/**
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* @library ta12200
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* @sensor ta12200
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* @comname TA12-200 Current Transformer
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* @altname Grove Electricity Sensor
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* @type electric
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* @man seeed
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* @web http://www.seeedstudio.com/wiki/Grove_-_Electricity_Sensor
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* @con analog
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*
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* @brief API for the TA12-200 Current Transformer
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*
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* UPM module for the TA12-200 current transformer found,
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* for instance, in the Grove Electricity Sensor.
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* This module can measure AC moving through a wire at up
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* to 5 A.
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*
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* @image html ta12200.jpg
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* @snippet ta12200.cxx Interesting
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*/
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class TA12200 {
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public:
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/**
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* TA12200 constructor
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*
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* @param pin Analog pin to use
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*/
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TA12200(int pin);
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/**
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* TA12200 destructor
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*/
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~TA12200();
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/**
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* Returns the number of milliseconds elapsed since initClock()
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* was last called.
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*
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* @return Elapsed milliseconds
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*/
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uint32_t getMillis();
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/**
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* Resets the clock
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*
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*/
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void initClock();
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/**
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* Gets the conversion value from the sensor
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*
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* @return Highest value obtained over 1 second of measuring
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*/
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unsigned int highestValue();
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/**
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* Computes the measured voltage
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*
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* @param val Value measured by highestValue()
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* @param res ADC resolution
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*
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* @return Measured current in mA
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*/
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float milliAmps(unsigned int val, int res=TA12200_ADC_RES);
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private:
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struct timeval m_startTime;
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mraa_aio_context m_aio;
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};
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}
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