Advice on proximity sensors please?

jackrussell007

Evening folks

hope you can advise, fell free to move my thread if posted in the wrong place.

I want to try build a device which has some sort of proximity sensor which would trigger a switch if another remote device comes within a certain configurable distance(5-6mtr for example) of the base station. Ideally I'd like the remote device to be very small so I could put it on a very small dog or a guinea pig even, and if that remote device comes within 5 mtr of the base station then a switch is triggered.

hope I'm not being annoyingly vague, i dont want to give away my million dolla idea.

anyway what kind of sensor would do that job for me?

thanks

gctest50

.

http://www.amazon.com/Power-Pet-Large-Electronic-PX-2/dp/B003SLTETG


loads of ways to do it - depends what you want to do

spideog7

Bluetooth Low Energy Beacon would do it. They're designed for this sort of stuff. Very easy to prototype too, you can buy them ready to go for about 10 or 15 euro.