Fixed voltage algorithm. (#182)

Author: ATATC

src/VoltageSensor.cpp

@@ -1,7 +1,7 @@
 #include "VoltageSensor.h"
 
-VoltageSensor::VoltageSensor(int *const pins) : Device<float>(pins) {}
+VoltageSensor::VoltageSensor(int r1, int r2, int *const pins) : _factor((float) (r1 + r2) / r2), Device<float>(pins) {}
 
 void VoltageSensor::initialize() { pinMode(_pins[0], INPUT); }
 
-float VoltageSensor::read() { return (float) analogRead(_pins[0]) * 5 / 1023; }
+float VoltageSensor::read() { return (float) analogRead(_pins[0]) * _factor * 5 / 1023; }

src/VoltageSensor.h

@@ -5,8 +5,10 @@
 #include "Device.h"
 
 class VoltageSensor : public Device<float> {
+protected:
+    float _factor;
 public:
-    VoltageSensor(int *const pins);
+    VoltageSensor(int r1, int r2, int *const pins);
     void initialize();
     float read();
 };