Add control for the WiFi shield FET

Author: thgeorgiou

keywords.txt

@@ -14,4 +14,7 @@ begin KEYWORD2
 refresh KEYWORD2
 readPM25 KEYWORD2
 readPM10 KEYWORD2
-readPM01 KEYWORD2
+readPM01 KEYWORD2
+enablePowerControl KEYWORD2
+turnOn KEYWORD2
+turnOff KEYWORD2

library.properties

@@ -1,5 +1,5 @@
 name=hackAIR
-version=0.3.4
+version=0.4.0
 author=Thanasis Georgiou <[email protected]>
 maintainer=Thanasis Georgiou <[email protected]>
 sentence=A library for using a variety of air quality sensors.

src/hackair.cpp

@@ -141,3 +141,15 @@ void hackAIR::clearData(hackAirData &data) {
     data.tamper = 0;
     data.battery = 0;
 }
+
+void enablePowerControl() {
+    pinMode(A2, OUTPUT);
+}
+
+void turnOn() {
+    digitalWrite(A2, HIGH);
+}
+
+void turnOff() {
+    digitalWrite(A2, LOW);
+}

src/hackair.h

@@ -64,12 +64,27 @@ class hackAIR {
      * sensors.
      */
     void refresh(hackAirData &data);
-    
+
     /**
      * Empties a hackAir data structure
      */
     void clearData(hackAirData &data);
 
+    /**
+     * Uses pin A2 to control the sensor power switch (FET)
+     */
+    void enablePowerControl();
+
+    /**
+     * Turn the sensor power on
+     */
+    void turnOn();
+
+    /**
+     * Turn the sensor power off
+     */
+    void turnOff();
+
 private:
     int _sensorType;
     long _lastTime;