Added AM2302 sensor reading to one of the screens

include/am2302_sensor.h

@@ -0,0 +1,28 @@
+#ifndef AM2302_SENSOR_H
+#define AM2302_SENSOR_H
+
+#include <Arduino.h>
+
+struct Am2302Reading
+{
+  float temperatureC;
+  float humidityPercent;
+  bool valid;
+};
+
+class Am2302Sensor
+{
+public:
+  explicit Am2302Sensor(uint8_t pin);
+
+  void begin();
+  bool update(unsigned long now);
+  Am2302Reading reading() const;
+
+private:
+  uint8_t pin_;
+  unsigned long nextRead_;
+  Am2302Reading reading_;
+};
+
+#endif