Kevin Zhou shared his Lego Boom gate on Youtube!
Today, I made my own boom gate with RFID reader/writer. Also with lego to make that. This is used to prevent people from coming in without your permission. Only those with the right cards can pass trough.
Each Monday is ArduinoMonday here at Adafruit! Be sure to check out our posts, tutorials and new Arduino related products. Adafruit manufactures the Arduino right here in the United States in cooperation with arduino.cc. We have a huge selection of Arduino accessories and all the code and tutorials to get you up and running in no time!