The droids built in SWGE Droid Depot at Disney Land and Disney World Hollywood Studios respond to BLE beacons placed throughout the park.
Use a low-cost nRF24L01 wireless transceiver connected to an Arduino Uno/Nano/Pro to transmit bluetooth droid location signals. Based on work done by EricDavidEpperson, Ruthsarian, Spork|Dead Bothans, Cowkitty|Dead Bothans, Vince Parker, holapenguin, YohanUM.