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RFID Door 2

This is a second generation door controller to replace the current one.

Primary Features of the new controller:
  1. All-in-one embedded solution: no python laptop.
  2. More blinky lights (to help diagnose problems).
  3. Local cache file on uSD chip.
  4. Ethernet (or wifi?) direct to cloud using existing API (or maybe a wrapper?)
  5. POE?
Right now I am thinking of using Arduino UNO + Ethernet Shield.  Can easily leverage the existing arduino nano code.  The shield includes a uSD socket.  This is also an inexpensive (~$75) solution embedded solution to be used for other access control projects and foodbots.