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mq303a: Initial implementation of the mq303a alcohol sensor

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The module implements support for the mq303a alcohol sensor.  It was
tested on the Grove Alcohol Sensor.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Sarah Knepper <sarah.knepper@intel.com>
This commit is contained in:
Jon Trulson
2014-12-04 18:59:29 -07:00
committed by Sarah Knepper
parent 7d40425391
commit 509cc3a6d3
8 changed files with 317 additions and 0 deletions
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examples/javascript/mq303a.js Normal file
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/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:true */
/*global */
/*
* Author: Zion Orent <zorent@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.
*/
// Load alcohol sensor module
var mq303a = require('jsupm_mq303a');
// Instantiate an mq303a sensor on analog pin A0
// This device uses a heater powered from an analog I/O pin.
// If using A0 as the data pin, then you need to use A1, as the heater
// pin (if using a grove mq303a). For A1, we can use the D15 gpio,
// setup as an output, and drive it low to power the heater.
var myAlcoholObj = new mq303a.MQ303A(0, 15);
console.log("Enabling heater and waiting 2 minutes for warmup.");
// give time updates every 30 seconds until 2 minutes have passed
// for the alcohol sensor to warm up
statusMessage(1);
statusMessage(2);
statusMessage(3);
function statusMessage(amt)
{
setTimeout(function()
{
console.log((amt * 30) + " seconds have passed");
}, 30000 * amt);
}
// run the alcohol sensor in 2 minutes
setTimeout(runAlcoholSensor, 120000);
function runAlcoholSensor()
{
var notice = "This sensor may need to warm " +
"until the value drops below about 450."
console.log(notice);
// Print the detected alcohol value every second
setInterval(function()
{
var val = myAlcoholObj.value();
var msg = "Alcohol detected ";
msg += "(higher means stronger alcohol): ";
console.log(msg + val);
}, 1000);
}
// Print message when exiting
process.on('SIGINT', function()
{
console.log("Exiting...");
process.exit(0);
});