Here is a simple, yet useful circuit of an Arduino 4-digit 7-segment LED display unit. The module used here is a self-contained, compact common-cathode module containing four 7-segment LED numeric ...

Electronic and Arduino enthusiasts searching for an Arduino project to keep them busy this weekend may be interested in a new Arduino Mega fingerprint door lock. Using a little Arduino programming ...

The security flaws on this common hotel keycard lock are nothing short of face ... Yes, in less than 1/4 of one second an Arduino can open any of the millions of these locks in service.

and to program the lock with a the hotel's "sitecode" -- a 32-bit key that identifies the hotel. By plugging an Arduino microcontroller into the DC socket, Brocious found that he could simply read ...