Research on dynamic history curve based on embedded Web server

Clients can exchange data with embedded device where Web server is transplanted. In order to observe the state of the device and display it in the form of dynamic history curve, this paper has adopted two methods to get the real-time data of the embedded device and display the curve. One uses JavaScript cooperating with VML (Vector Markup Language), the other uses Applet. The two methods both have good displaying effect. The first method is complicated. It demands that clients install IE browser. The code of the second method is simple but needs the installation of JRE on the client side. These two methods have a quite bright prospect and can be applied in various fields.

I. Introduction

With the development of the embedded system and the popularity of Internet, it has become an important trend that the embedded system connects with Internet. Embedded Web server is an important aspect of network applications of embedded system. It can use the Internet, and clients don't need special monitoring software. The expense of communication has a low cost. It is convenient to operate and to maintain and can be widely used for remote industrial control and digital home and so on.