Nýtt branch og kóðar plús breytingar á fyrri kóðum fyrir part 4

include/pre_operational_state.h

@@ -0,0 +1,21 @@
+#ifndef PRE_OPERATIONAL_STATE_H
+#define PRE_OPERATIONAL_STATE_H
+
+#include "state.h"
+
+class PreOperationalState : public State
+{
+private:
+    unsigned long previous_time;
+    bool led_state;
+
+public:
+    PreOperationalState();
+
+    void enter() override;
+    void update() override;
+    void command(char c) override;
+    void exit() override;
+};
+
+#endif