Minor fixes:

- Added boilerplate to header files to avoid multiple includes

include/Commands.h

@@ -1,3 +1,6 @@
+#ifndef COMMANDS_H
+#define COMMANDS_H
+
 enum Lights {
   BACKLIGHT = 0,
   FRONTLIGHT = 1
@@ -39,3 +42,5 @@ enum Command {
 typedef enum Command Command;
 typedef enum Scrolls Scrolls;
 typedef enum Lights Lights;
+
+#endif

include/Config.h

@@ -1,3 +1,5 @@
+#ifndef CONFIG_H
+#define CONFIG_H
 /*-------- Pin definitions --------*/
 
 // Vertical motor top
@@ -70,3 +72,5 @@ const int SCROLL_ERROR_MS = 500;    // if sensor values don't change in this tim
 
 #define UI_ON_MS          500       // General user interaction blink interval
 #define UI_OFF_MS         500
+
+#endif

include/Motor.h

@@ -1,3 +1,6 @@
+#ifndef MOTOR_H
+#define MOTOR_H
+
 #include <Arduino.h>
 
 class Motor
@@ -13,3 +16,5 @@ public:
   void run(uint8_t speed, bool forward);
   void stop(bool freewheel);
 };
+
+#endif

include/States.h

@@ -1,3 +1,6 @@
+#ifndef STATES_H
+#define STATES_H
+
 /*-------- State Definitions --------*/
 
 /**
@@ -72,3 +75,5 @@ bool transition_init_wait();
  * @return false 
  */
 bool transition_wait_sercom();
+
+#endif