DIY Security Projects:

• DIY secret rooms with DIY rotating bookshelves, passageways.
• Make custom locks using RFID, keypads, NES controllers, and more RFID.
• Design your own laser surveillance system.

Learn how to create your own RFID locking mechanism using the Parallax RFID module.ﾃあ If you’re unfamiliar with RFID, don’t miss our comprehensive RFID tutorial.ﾃあ The project uses the rather old school Basic Stamp instead of the Arduino but it gets the job done.ﾃあ When it’s completed, the door looks stock on the outside but a high tech lock is mounted inside.

• Use RFID to Protect your Beer, Valuables
• DIY Keypad Security System using Arduino
• DIY Dorm Project – Beer Launching Fridge

There are six (or more) push switches. To ‘unlock’ you must press all the correct ones at the same time, but not press any of the cancel switches. Pressing just one cancel switch will prevent the circuit unlocking. When the circuit unlocks it actually just turns on an LED for about one second, but it is intended to be adapted to turn on a relay which could be used to switch on another circuit. Build your own.

This Dummy Alarm project makes an LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. An on/off switch is not included, but could be added if you wish.