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878ca55385
Tested on the Grove I2C ADC. Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Sarah Knepper <sarah.knepper@intel.com>
69 lines
2.4 KiB
JavaScript
69 lines
2.4 KiB
JavaScript
/*jslint node:true, vars:true, bitwise:true, unparam:true */
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/*jshint unused:true */
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/*global */
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/*
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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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* 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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// Load ADC121C021 module
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var I2C_ADC = require('jsupm_adc121c021');
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// Instantiate an ADC121C021 on I2C bus 0
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var myI2C_ADC = new I2C_ADC.ADC121C021(I2C_ADC.ADC121C021_I2C_BUS,
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I2C_ADC.ADC121C021_DEFAULT_I2C_ADDR);
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var g_sum, g_iteration, g_intervalObj;
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var g_total_iteration_count = 30;
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// An analog sensor, such as a Grove light sensor,
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// must be attached to the adc
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main();
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// this function will be called by itself
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function main()
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{
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g_sum = 0;
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g_iteration = 0;
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// Sum the value every 50 milliseconds for g_total_iteration_count times
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// Then print the average value and corresponding voltage
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g_intervalObj = setInterval(function(I2CADC_val)
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{
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g_sum += I2CADC_val;
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if (g_iteration >= g_total_iteration_count)
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{
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g_iteration = 0;
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var val = (g_sum / g_total_iteration_count);
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console.log("ADC value: " + val + " Volts = " +
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myI2C_ADC.valueToVolts(val));
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clearInterval(g_intervalObj);
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// Now that we're done with this iteration, go to the next iteration
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main();
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}
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g_iteration++;
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}, 50, myI2C_ADC.value());
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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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