steve10101 Posted October 20, 2015 Report Share Posted October 20, 2015 Hey guys,I'm trying to make a proximity alarm and having trouble finding info. I can find plenty of examples for projects for an alarm and transmitter where as soon as the transmitter is a certain distance away the alarm flashes. What I'm wanting is the opposite, as soon as the transmitter is within a certain distance the alarm flashes. I'm sure this is as simple but I'm completely new to electronics so have no idea if its as simple as reversing a few things etc??? I don't even know the correct name for this product?? Any help or direction on this subject would be greatly appreciated.Cheers Jacquelyn Norris 1 Quote Link to comment Share on other sites More sharing options...
admin Posted October 20, 2015 Report Share Posted October 20, 2015 Hello and welcome,It would be helpful if you post here some of the circuits you found that are close to what you are looking to build. What is the distance that the transmitter needs to be from the receiver to trigger the alarm? Quote Link to comment Share on other sites More sharing options...
steve10101 Posted October 20, 2015 Author Report Share Posted October 20, 2015 Hiya, I now cant find the projects I found yesterday sorry... but the below link is a device similar to what I'm looking for, but I'm looking to make this work in reverse (hoping this may help). The distance I'm trying to achieve would be for the alarm to activate if transmitter was anything from 0-10 feet away.http://www.pimall.com/nais/rdiftagalert.html Jacquelyn Norris 1 Quote Link to comment Share on other sites More sharing options...
steve10101 Posted October 22, 2015 Author Report Share Posted October 22, 2015 Link below to circuits of what I'm looking for but in reverse. don't need all the extras this comes with but just a detector and some kind of transmitterhttp://www.google.com/patents/US5652569 Quote Link to comment Share on other sites More sharing options...
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