Design and implementation of LED voice communication system for crime prevention lighting

摘要

With the development of the city, LED street lamps on urban roads gradually come into people's vision. This paper first investigates the lighting situation in some dark places on campus. On the premise of meeting the requirements of campus lighting at night, a new anti-crime method combining crime prevention lighting and optical communication is proposed. Through the transmission of voice signals, pedestrians are reminded to enhance safety and reduce the probability of dangerous events. To solve the question of visible light sound communication based on white LEDs,a 9W white LEDcommunication system is designed which can realize 300~8000Hz sound signal transmission.Firstly,the paper gives the overall design scheme based on UART according to the requirements. Secondly, the hardware equipment is made.Finally,the program of MCU is designed.Tseting and practical application show that the communication distance is 30cm,the baud rate is 227kb/s,the sound power is 0.7w,the system reaches the design requirements.