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There are some issues using this device on the 101 with Firmata: 1. You cannot use any other ADC resolution than 1024. By default the driver would try to set 12b resolution for improved accuracy. Doing this on the 101 yielded nonsensical readings causing the driver to fail. Using 10b resolution will yield less accuracy, but at least the driver will function. 2. After the first ADC read, and for some time period after, the MRAA aio_read() calls will always return 0. This would cause an exception to be thrown by the driver since this is an invalid reading. Now, we do an analog read on each channel and sleep for .5 seconds in the ctor to get around this problem. It is a hack and should be properly fixed somewhere else (firmata? MRAA?). Some code was reworked/renamed to make it more clear what is actually going on. In addition a setDebug() method was added to enable some debugging output. Signed-off-by: Jon Trulson <jtrulson@ics.com>
83 lines
2.3 KiB
C++
83 lines
2.3 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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#include <unistd.h>
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#include <iostream>
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#include <iomanip>
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#include <stdexcept>
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#include <signal.h>
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#include "otp538u.hpp"
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using namespace std;
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bool shouldRun = true;
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// analog voltage, usually 3.3 or 5.0
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#define OTP538U_AREF 5.0
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void sig_handler(int signo)
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{
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if (signo == SIGINT)
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shouldRun = false;
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}
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int main()
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{
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signal(SIGINT, sig_handler);
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//! [Interesting]
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// Instantiate a OTP538U on analog pins A0 and A1
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// A0 is used for the Ambient Temperature and A1 is used for the
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// Object temperature.
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upm::OTP538U *temps = new upm::OTP538U(0, 1, OTP538U_AREF);
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// enable debugging if you would like
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// temps->setDebug(true);
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// Output ambient and object temperatures
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while (shouldRun)
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{
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try {
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cout << "Ambient temp: " << std::fixed << setprecision(2)
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<< temps->ambientTemperature()
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<< " C, Object temp: " << temps->objectTemperature()
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<< " C" << endl;
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}
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catch (std::out_of_range& e) {
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cerr << "Temperature(s) are out of range: " << e.what()
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<< endl;
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}
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cout << endl;
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sleep(1);
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}
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//! [Interesting]
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cout << "Exiting" << endl;
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delete temps;
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return 0;
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}
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