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63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
/*
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* Author: Zion Orent <zorent@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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// Load alcohol sensor module
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var mq303a = require('jsupm_mq303a');
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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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var myAlcoholObj = new mq303a.MQ303A(0, 15);
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console.log("Enabling heater and waiting 2 minutes for warmup.");
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// give time updates every 30 seconds until 2 minutes have passed
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// for the alcohol sensor to warm up
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statusMessage(1);
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statusMessage(2);
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statusMessage(3);
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function statusMessage(amt)
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{
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setTimeout(function()
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{
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console.log((amt * 30) + " seconds have passed");
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}, 30000 * amt);
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}
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// run the alcohol sensor in 2 minutes
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setTimeout(runAlcoholSensor, 120000);
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function runAlcoholSensor()
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{
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var notice = "This sensor may need to warm " +
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"until the value drops below about 450."
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console.log(notice);
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// Print the detected alcohol value every second
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setInterval(function()
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{
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var val = myAlcoholObj.value();
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var msg = "Alcohol detected ";
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msg += "(higher means stronger alcohol): ";
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console.log(msg + val);
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}, 1000);
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}
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// Print message when exiting
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process.on('SIGINT', function()
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{
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console.log("Exiting...");
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process.exit(0);
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});
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