Embedded temperature Web controller based on IPv4 and IPv6

This paper firstly analyses the disadvantages of traditional instrument and the advantages of embedded Web technique applied to temperature controller. Then a new concept of utilizing MCU as servers is put forward, rising a feasible solution to seamless connection between field control devices and Internet and completely realizing remote monitor and control. According to this new concept, the design scheme of an embedded temperature Web (ETWC) controller with 8-bit microprocessor as its core on the base of IPV4 and IPv6 protocol is presented. In order to make the ETWC work availably during the interim between IPv4 and IPv6, dual-stack technology, as one of the characters of the ETWC, is applied. For the communication protocol is important to the ETWC, the implementation of the embedded TCP/IP protocol is one key point of it. Not as the standard protocols used in PC, the protocol stack is modularized which can be properly adjusted according to application requirements of the system. So the reduced and design methods of the IPv4 and IPv6 protocols and the implementation of the HTTP finite state machine are presented in detail. Moreover, a testing network of IPv6 and its results are presented. Finally the paper points out the future trend of the embedded Web technique.