Added temperature and relay nodes

lib/HomieNodes/SensorNode.hpp

@@ -0,0 +1,26 @@
+/*
+ * SensorNode.hpp
+ * Homie Node for genric sensors.
+ * Provides a limit method for measurement values
+ *
+ * Version: 1.0
+ * Author: Lübbe Onken (http://github.com/luebbe)
+ */
+
+#pragma once
+
+#include <Homie.hpp>
+
+class SensorNode : public HomieNode
+{
+protected:
+  const float cMinHumid = 0.0;
+  const float cMaxHumid = 100.0;
+  static const int MEASUREMENT_INTERVAL = 300;
+
+  float computeAbsoluteHumidity(float temperature, float percentHumidity);
+  void fixRange(float *value, float min, float max);
+
+public:
+  explicit SensorNode(const char *name, const char *type);
+};