I'm trying to build some sort of device that will detect if one object is out of a relatively close range (distance of maybe 3 meters?) of another object, so it could be used to let you know if you lost something its attached to (for example, attached to a key chain). I would like this device to be portable and small.
I tried looking into RFIDs for this but I found out that that type of transmitter/receiver might not work, and may be too expensive.
I am new to this kind of stuff, so any kind of advice would be appreciated
If you want a solution that does not involve wired connections I don't think it will be easy - or cheap.
One option would be to have a master device which regularly polls the slave devices over a wireless link. If a device is out of range it won't reply. The master and all the slaves would each need some sort of "Arduino" and a wireless transceiver - perhaps an NRF24 device - and a battery.
If you can design and build your own PCBs you could make a very small device - e.g these Deltinos that I use in model trains.
Just read a flyer from my local electronics store (Coincidence?):
A bluetooth device you can fit onto you luggage. If the luggage gets stolen (Removes itself about 3 meter/10 feet) from your location, you'll get a message and an alarm goes off.
And if during luggage pickup your luggage is within that area, you'll get a friendly "Your luggage has arrived" message...
Consumer bluetooth has a PAN (Personal Area Network) of around 3 meters. High end, like the one in playstation controllers can go up to 25 meters.
Robin2:
If you want a solution that does not involve wired connections I don't think it will be easy - or cheap.
One option would be to have a master device which regularly polls the slave devices over a wireless link. If a device is out of range it won't reply. The master and all the slaves would each need some sort of "Arduino" and a wireless transceiver - perhaps an NRF24 device - and a battery.
If you can design and build your own PCBs you could make a very small device - e.g these Deltinos that I use in model trains.
...R
I only need this device to connect to one other component not several objects, would that make it easier? And size isnt a huge issue, i just want something somewhat easy to make and which would work. Would the NRF24 device you mentioned work for this?
