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65 lines
1.5 KiB
C++
65 lines
1.5 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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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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#include <iostream>
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#include <signal.h>
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#include "mq303a.hpp"
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#include "upm_utilities.h"
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using namespace std;
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int shouldRun = true;
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void
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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
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main()
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{
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signal(SIGINT, sig_handler);
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//! [Interesting]
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// Instantiate an mq303a sensor on analog pin A0
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// This device uses a heater powered from an analog I/O pin.
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// If using A0 as the data pin, then you need to use A1, as the heater
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// pin (if using a grove mq303a). For A1, we can use the D15 gpio,
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// setup as an output, and drive it low to power the heater.
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upm::MQ303A mq303a(0, 15);
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cout << "Enabling heater and waiting 2 minutes for warmup." << endl;
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mq303a.heaterEnable(true);
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upm_delay(120);
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cout << "This sensor may need to warm until the value drops below about 450." << endl;
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// Print the detected alcohol value every second
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while (shouldRun) {
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int val = mq303a.value();
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cout << "Alcohol detected (higher means stronger alcohol): " << val << endl;
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upm_delay(1);
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}
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//! [Interesting]
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cout << "Exiting" << endl;
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mq303a.heaterEnable(false);
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return 0;
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}
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