Based on researching of Bluetooth Protocol, a kind of Bluetooth data transferring system based on MCU-controlling
has been proposed in the paper. In the system, the MCU in which the Bluetooth HCI protocol has been embedded is
used to control the Bluetooth module on UART and make the Bluetooth devices in the Bluetooth network establish
connection and transfer data automatically. In the hardware design, the chip C8051F020 is selected as the host
controller. Because chip C8051F020 has two UART serial interfaces, it can meet the requirement of design, simplify
the circuit and enhance system anti-jamming capability. The Bluetooth module used in the system is CSR Bluetooth
Core 4 with Bluetooth Standard 2.0 class 1 which has the advantages of high signal sensitivity, long distance of
connection and easy to use..