Shinnyei PPD42NJ particles sensor reading
Library to read values out of a Shinyei PPD42NJ particles sensor
Diff: Shinyei.cpp
- Revision:
- 0:995d42a37328
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Shinyei.cpp Thu Jan 26 15:07:26 2017 +0000 @@ -0,0 +1,65 @@ +/*! + * 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(); +} \ No newline at end of file