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40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
/*
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* Author: Zion Orent <zorent@ics.com>
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* Copyright (c) 2015 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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var differential_amplifier_lib = require("jsupm_ina132");
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// Tested with the INA132 Differential Amplifier Sensor module.
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// Instantiate an INA132 on analog pin A0
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var differential_amplifier_obj = new differential_amplifier_lib.INA132(0);
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var myInterval = setInterval(function()
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{
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console.log(roundNum(differential_amplifier_obj.value(), 5));
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}, 1000);
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function roundNum(num, decimalPlaces)
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{
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var extraNum = (1 / (Math.pow(10, decimalPlaces) * 1000));
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var numerator = Math.round((num + extraNum) * (Math.pow(10, decimalPlaces)));
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var denominator = Math.pow(10, decimalPlaces);
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return (numerator / denominator);
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}
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// When exiting: clear interval, and print message
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process.on('SIGINT', function()
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{
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clearInterval(myInterval);
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differential_amplifier_obj = null;
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differential_amplifier_lib.cleanUp();
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differential_amplifier_lib = null;
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console.log("Exiting");
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process.exit(0);
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});
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