Dangerous Prototypes forum participant pppd described his door lock reminder that buzzes to remind him to lock his apartment door. It consists of an ATtiny13 with two reed switches and a buzzer.

I don’t know about you guys but I constantly catch myself wondering whether I have locked my apartment door or not. I never actually forgotten to turn the key but I did come back just to make sure a bunch of times. Usually it is when I am in a rush trying to catch a bus knowing the next one won’t be soon. Anyway, I wanted to do it for a long time, but I finally got some time this evening and I came up with a simple device that will do the job of remembering for me.

[Via Dangerous Prototypes]

John Baichtal

John Baichtal

My interests include writing, electronics, RPGs, scifi, hackers & hackerspaces, 3D printing, building sets & toys. @johnbaichtal nerdage.net

  • WC

    Very nice.  I have the same doorlock problem.

  • http://pulse.yahoo.com/_SBIQQREBJJYBLGRCBLFIS3UPTQ JamesW

    Now can you make me one that will text me when the garage door goes down, so I won’t drive around the block to make sure I closed it?

    • https://plus.google.com/116544320946631167234/posts?hl=en Tim Kemp

      I don’t know how well it works, but Sears has this: http://www.craftsman.com/craftsman-dc-chain-drive-garage-door-opener-with-assurelink/p-00930437000P  There are iPhone and Android apps so you can check/control your garage door.  It wouldn’t be that hard (and it would be more fun) to make your own, but if you are low on time and not on money this would be a possibility.