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73 lines
2.1 KiB
JavaScript
73 lines
2.1 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 digitalAccelerometer = require('jsupm_mma7660');
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// Instantiate an MMA7660 on I2C bus 0
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var myDigitalAccelerometer = new digitalAccelerometer.MMA7660(
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digitalAccelerometer.MMA7660_DEFAULT_I2C_BUS,
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digitalAccelerometer.MMA7660_DEFAULT_I2C_ADDR);
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// place device in standby mode so we can write registers
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myDigitalAccelerometer.setModeStandby();
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// enable 64 samples per second
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myDigitalAccelerometer.setSampleRate(digitalAccelerometer.MMA7660_AUTOSLEEP_64);
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// place device into active mode
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myDigitalAccelerometer.setModeActive();
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var ax, ay, az;
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ax = digitalAccelerometer.new_floatp();
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ay = digitalAccelerometer.new_floatp();
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az = digitalAccelerometer.new_floatp();
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var outputStr;
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var myInterval = setInterval(function()
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{
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myDigitalAccelerometer.getAcceleration(ax, ay, az);
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outputStr = "Acceleration: x = "
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+ roundNum(digitalAccelerometer.floatp_value(ax), 6)
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+ "g y = " + roundNum(digitalAccelerometer.floatp_value(ay), 6)
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+ "g z = " + roundNum(digitalAccelerometer.floatp_value(az), 6) + "g";
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console.log(outputStr);
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console.log();
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}, 500);
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// round off output to match C example, which has 6 decimal places
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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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return (Math.round((num + extraNum)
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* (Math.pow(10, decimalPlaces))) / Math.pow(10, decimalPlaces));
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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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// clean up memory
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digitalAccelerometer.delete_intp(x);
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digitalAccelerometer.delete_intp(y);
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digitalAccelerometer.delete_intp(z);
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digitalAccelerometer.delete_floatp(ax);
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digitalAccelerometer.delete_floatp(ay);
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digitalAccelerometer.delete_floatp(az);
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myDigitalAccelerometer.setModeStandby();
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console.log("Exiting...");
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process.exit(0);
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});
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