Electronic Hotel Card Locks
These are wonderful little microcomputer projects masquerading as door locks. Inside there’s a processor running a program, with I/O leads going to things like the magnetic strip reader, or the infrared LEDs, and the solenoid, and the lights on the outside.
They are powered entirely by a battery pack, and the circuitry is designed such that it draws almost nil power while idle. The cards are usually magnetic-strip or infrared.
The nice thing about these systems is that the cards are generally expendable; the guest doesn’t have to return them or worry about lost-key charges, the hotel can make them in quantity on the fly, and the combination changes for each new guest in a given room.
You are going to read in relation to the workings of the Electronic Hotel Card Locks and learn if Hotel Card Locks can be used in houses
