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();
+}
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