The managing of goods that enter and leave the carrier is done
by a single RFID antenna, which is located on the exit door of the
Carrier Station. That way, we implemented an embedded software
in Arduino Mega 2560. This software receives the tags by the RFID
reader through the RX of serial communication, makes the control
of entrance or leaving using a binary tree, and sends these events
for the SafeTrack Mobile, using the Bluetooth module. This approach
of employing one single antenna was chosen because its economic
costs.