【摘要】 设计了一种基于两片AVR单片机的交通诱导屏显示单元控制系统,该系统由通信模块、显示控制模块和开关模块3部分组成。单片机A用于以RS-485的通信方式接收数据和应答主机,把处理好的数据发送到I/O口并写入EEPROM中,再通知单片机B读取数据。单片机B接收到数据后控制LED显示,通过调节驱动LED电流占空比的方式调节LED的亮度。给出了控制系统的硬件和软件设计方案。更多还原

【Abstract】 The paper designs a traffic guidance display unit control system based on two AVR microcontroller. This system is consist of three parts, which are the communication module, the master module and switch module. Microcontroller A receives data and answers the host by RS-485 communication, sends the processed data to the I/O port and writes to the EEPROM, then notifies the microcontroller B to read data. Microcontroller B controls LED display after receiving data, adjusts LED brightness by adjusting the duty cycle of the LED drive current. It gives hardware and software design of the control system.更多还原