Shinnyei PPD42NJ particles sensor reading
Library to read values out of a Shinyei PPD42NJ particles sensor
Shinyei.cpp
- Committer:
- abouillot
- Date:
- 2017-01-26
- Revision:
- 0:995d42a37328
File content as of revision 0:995d42a37328:
/*! * Shinyei.cpp * * Read the particle concentration using a Shinyei PPD42NJ sensor * * Copyright (c) 2017 - Alexandre Bouillot github.com/abouillot * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documnetation 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 * furished 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 OR 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. */ #include "Shinyei.h" void Shinyei::startSampling(int duration) { _samplingTimer.attach(callback(this, &Shinyei::samplingComplete), (float)duration); _dataReady = false; _callbackSet = false; _pwm.start(); } void Shinyei::startSampling(Callback<void()> function, int duration) { _samplingTimer.attach(callback(this, &Shinyei::samplingComplete), (float)duration); _dataReady = false; _callbackSet = true; _callback = function; _pwm.start(); } void Shinyei::stopSampling() { _pwm.stop(); // _callbackSet = false; // Need to cancel the timer // _samplingTimer.attach(callback(this, &samplingComplete), (float)duration); _dataReady = false; _pwm.start(); } void Shinyei::samplingComplete() { _pwm.stop(); float ratio = _pwm.occupacyLow(); _concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve _dataReady = true; if (_callbackSet) _callback(); }