Abstract: A power supply with a separable communication module includes a casing with a port; a main board placed in the casing and having a power conversion circuit; a sub-board electrically connected to the power conversion circuit and provided with at least one first connector; and a communication module. The power conversion circuit has at least one electrical connection terminal. A first interface of the first connector faces the port. The communication module includes a first circuit board and a communication circuit disposed on the first circuit board, the first circuit board has an electrical connection part electrically connected to the communication circuit, the electrical connection part has a first state of connecting with the first interface, and a second state of detaching from the first interface.

Abstract: A parking lot management system comprising a computer host, a handheld device, an entrance sensor, an entrance camera, an entrance stop, an exit sensor, an exit camera, and an exit stop is disclosed. The handheld device interactively transmits data with the entrance sensor and the exit sensor by near-field communication techniques. Each of the entrance camera and the exit camera takes a photo and acquires a license plate number of a vehicle and communicates this information with the computer host. After the computer host confirms and verifies some specific data, the computer host sends instructions to the entrance stop or the exit stop for allowing the vehicle to either enter or exit a parking lot. When exiting the parking lot, the parking fee is paid by the electronic wallet of the handheld device.

Abstract: A parking lot management system comprising a computer host, a handheld device, an entrance sensor, an entrance camera, an entrance stop, an exit sensor, an exit camera, and an exit stop is disclosed. The handheld device interactively transmits data with the entrance sensor and the exit sensor by near-field communication techniques. Each of the entrance camera and the exit camera takes a photo and acquires a license plate number of a vehicle and communicates this information with the computer host. After the computer host confirms and verifies some specific data, the computer host sends instructions to the entrance stop or the exit stop for allowing the vehicle to either enter or exit a parking lot. When exiting the parking lot, the parking fee is paid by the electronic wallet of the handheld device.