基于AVR单片机的ELVISⅡ扩展平台

Design of ELVIS II Expanded Platform Based on AVR Microcontroller

针对目前网络实验室虚拟实验教学资源不足的现状,设计了一个基于ATmega8单片机控制的可切换的ELVISⅡ(NI教学实验虚拟仪器套件)扩展平台。该平台通过将ELVISⅡ实验台上的模拟输入/输出信号、数字输入/输出信号、电源信号、函数发生器等相关的信号通过模拟开关技术扩展成6路信号,对单片机运用软编程技术并通过串口与PC机通信,从而控制6块实验板之间的切换。上位机通过LabVIEW编程制作便于人机交互的图形操作界面,该系统成功地拓展了实验资源,满足了虚拟实验教学的要求,造价低,而且通过因特网和网络摄像头还实现了远程操作和监控。该扩展平台通过了测试并且在iLab实验室中正常运行。

In view of the shortage of current network laboratory experiment resources for teaching,an expanded platform of ELVIS II（NI teaching experiment virtual instrument package） is proposed,which can be switched between the different boards based on the ATmega8 microcontroller.Analog input/output signals,digital input/ output signals,the function generator signals,power supply and many other signals which corns from ELVIS II are expanded into six groups of signals based on analog switching technology.PC communicates with microcontroller through a serial port by using the soft programming technology to switch the experiments on board to the corresponding board for operation.Developing VI programs by using Lab VIEW is convenient.The system can satisfy the demands of virtual experiment teaching at lower cost.In addition,it can also be used for the remote operation and monitoring through the network and cameras.The expanded platform has been tested and operates normally in iLab laboratory.