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Distance Alarm? Answered

Hello,

I am interested in seeing if I can create some sort of alarm for my 10 year old son.  He has autism and I'm looking for something kind of like a house arrest ankle bracelet BUT i don't want it to track where he is. (Not at this point anyway).   For now i just want to see if I can make a distance alarm.  I would strap a bracelet to his ankle and I could carry the alarm unit in my pocket to If he got more than 100 feet from my device I would hear an alarm.  He has an issue with wondering away and the electronic monitoring companies want to charge hundreds of dollars to put a house arrest type monitor on him.  If i could make  something that would warn me when he starts to wonder that would be amazing!

Can anyone point me in the correct direction?

Thanks

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mh76dk

4 years ago

You can get some pretty cheap devices from various chinese sites, here is one:

http://www.dhgate.com/product/white-and-black-colo...

(that particular one seems to require you buy 4pcs at >$9/pcs and free shipping. still reasonably cheap if they work, and you got a couple of extras "in case". - beats "hundreds of dollars" anyways.)

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mh76dkmh76dk

Reply 4 years ago

And its <$9/pcs - or $33 for 4.

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mh76dkmh76dk

Reply 4 years ago

I am not sure why instructables eat my links, here is a second try:

http://www.dhgate.com/product/white-and-black-color-wireless-anti-lost/177841741.html