Riley Porter, a Make Projects contributor, has come up with an easy way to know when your post box is full, thanks to his Arduino Mail Notifier.
The reason behind his design was to notify him while he was working in the back of his yard. The project design is designed to be cost efficient, as it uses simple RF modules. The maker only has to wire the Arduino Mail Notifier with its boards and use breadboarding wire. Then, encoding the sketches, the maker can use and tweak the notifier until it is perfect, as according to Riley Porter's instructions.
The Arduino Mail Notifier is perfect for those who work away from the front of their house and would like to pick up their post as soon as it comes.