Outcome: 

The final prototype uses a hall effect sensor to sense and count the rounds the wheel turns. When the wheel turns 6726 times it's approximately 2 miles. When reached that goal (for indication the prototype will use 20 instead of 6726), the servo will turn and drop food into the cage.  Before the sensor sense anything, the LED is blue. When it started to sense, it turns red until it reaches the goal, then it turns green. A button is used to reset the counts, and when reset, the LED is blue again. When servo moves, another LED whill be on to indicate its movement.