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  Door has been opened notifier  
 Date Written 
A B Mar 08, 2012, 11:43pm EST Report Abuse
I'm trying to make craft a device that will let me know if my front door has been opened. Something simple; when the door opens, a wireless signal is sent from a module back to the main module which will in turn signal by illuminating a small light on the modules box (like a little pea sized neon green light commonly used on routers).
Or if you know of something like this for sale on the net, let me know please.

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john albrich Mar 08, 2012, 11:55pm EST Report Abuse
>> Re: Door has been opened notifier
Check out
Lots of security-related products. I've been disappointed in the actual v. claimed range of the wireless transmitters across the line, so I'd take any long-distance claim with a grain of salt. X10 has electro-mechanical/magnetic-pair sensors, vibration sensors, and passive IR sensors available. I've used them all with success. You could probably do what you want for $30 or so. You can easily add multiple doors and windows. They have frequent "sales".

There are also cheap single-use products out there from other manufacturers designed to activate when an old-style curbside mailbox has been opened (to let you know the mail has arrived). The indicator LED stays "on" until you reset the unit. They're something like $15 if memory serves. Again, take a claim of something like a "200 foot range" with a grain of salt.

Dr. Peaceful Mar 09, 2012, 02:53pm EST Report Abuse
>> Re: Door has been opened notifier
While John suggested more professional solutions, here is a more electronics hobbyist solution. Though, this is probably beyond what you need based on your descriptions above.

The link below basically described how to use a micro-controller chipset / board as a small web server and door switch. While you may not need to remote control your door to open/close, it can certainly keep track (history with time stamps) of when the door was opened and closed. Wonderful thing is, you can check that any where you go, as long as you have access to the internet.

Certainly better than just a LED indicator you described. I do, however, find it quite paranoid and over-kill to keep time-stamped history for a door in a residential home... ;) LOL



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