I'm looking for a a way to detect if an arduino is within a certain distance to another arduino wirelessly... Or maybe just for a clearly limited wireless connection.
More in detail: I want to set up a an arduino+sensors as a target an then throw (yes physically throw:)) a second arduino towards it. On impact with the ground the thrown arduino emits a signal, if that happens within about 5m of the target it is registered by and triggers an event on the target arduino (a led or counter) . If it impacts outside of the radius nothing happens
My question is: can that be done at least somewhat reliably and if yes how/which hardware could do that?
Thanks in advance, any tips are greatly appreciated