Added temperature and relay nodes

lib/HomieNodes/DHT22Node.hpp

@@ -0,0 +1,50 @@
+/*
+ * DHT22Node.hpp
+ * Homie Node for DHT-22 sensors using Adafruit DHT library.
+ *
+ * Version: 1.0
+ * Author: Lübbe Onken (http://github.com/luebbe)
+ */
+
+#pragma once
+
+#include <Adafruit_Sensor.h>
+#include <DHT_U.h>
+
+#include "SensorNode.hpp"
+#include "constants.hpp"
+
+#define DEFAULTPIN -1
+
+class DHT22Node : public SensorNode
+{
+private:
+  const float cMinTemp = -40.0;
+  const float cMaxTemp = 125.0;
+  const char *cCaption = "• DHT22 sensor";
+  const char *cIndent = "  ◦ ";
+
+  int _sensorPin;
+  unsigned long _measurementInterval;
+  unsigned long _lastMeasurement;
+
+  float temperature = NAN;
+  float humidity = NAN;
+
+  DHT *dht = NULL;
+
+  void printCaption();
+  void send();
+
+protected:
+  virtual void setup() override;
+  virtual void loop() override;
+
+public:
+  explicit DHT22Node(const char *name,
+                     const int sensorPin = DEFAULTPIN,
+                     const int measurementInterval = MEASUREMENT_INTERVAL);
+
+  float getHumidity() const { return humidity; }
+  float getTemperature() const { return temperature; }
+};