I want to create a device that can detect the presence of a BLE marker, then do something in response. It would be used as part of a kind of scavenger hunt. The marker would be hidden at some location, and the detector would "go off" when in the vicinity of the marker. The marker does not have to send any specific message to the detector; just a signal to indicate its presence.
But all the circuits I can find when I search for BLE are about how to make a BLE beacon from an Arduino, which is then interfaced with a smartphone. Is it possible to make a BLE detector from an Arduino that can detect the presence of, say, an iBeacon?
