The Design Of Dual Mode Bike Smart Lock Embedded System Based On Bluetooth Low Energy

The application of sharing bicycle has successfully solved the problem of "the last mile of urban trip" by virtue of its flexible leasing and has been rapidly developed.It is urgent to perfect the function of sharing bicycle smart lock.A Bluetooth Low Energy embedded system applied to smart lock of sharing bicycle is designed and a scheme of low power consumption is provides.Meanwhile,the system uses GPRS to communicate with the server and GPS technology to get information of location.In terms of hardware design,the CC2541 Bluetooth Low Energy chip is used as master controller with other modules as peripheral circuits such as touch-key,vibration detection and antenna and matching circuit which has been simulated.Two kinds of solar power supply schemes are put forward in addition.As to software design,the interface protocol of the application layer is drawn up according to different scenarios.On the basis of this,the BLE-CC254x-1.2.1 protocol stack and OSAL is used to fulfill functions.Afterwards,this paper carries out experiments of serial communication and data packets capturing,whose results reveal that the connection with mobile client and the server can be successfully implemented without packet loss.The power consumption of this system is 1mA in sleep mode and averages 3mA in work state,which assures the standby time of about 50 days.The embedded system designed in this paper has the characteristics of convenient,high reliability and low power consumption and has been applied to actual products.It has both Bluetooth near distance and GPRS long distance communication with two kinds of unlocking methods.This system is applied to various aspects,for instance,research of electronic parking pile and development of smart city.