New mail notifications in this mailbox

An interesting and convenient way to receive notifications about new letters in the physical mailbox presented Matt Richardson. This method can work with a mailbox, as well as the doors of a garage, a house or just a room.

The ego system is based on the Arduino sensor, which responds to a simple 'open-close' and transmits a signal via the Internet to the user's iPhone, on which a special application is already installed.

Excellent concept that requires minimal hardware knowledge to run and work. We are waiting for massive use?
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A source