DIY Door Lock Reminder

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]

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

View more articles by John Baichtal