Abstract
The Web-based Distributed Measurement and Control is becoming more and more prevalent in recent years. With programmable 1-wire Digital Temperature Sensor DS18B20, an embedded system is used as the field processing unit. With application mode of B/S, a remote temperature-measurement and control system is designed by embedded Web on embedded system. The experimental result shows that the system has high reliability and precision.
Highlights
LPC2210 with ARM7TDMI-S core as its microprocessor, realizes the information interacts with the client by HTTP protocol, the user transmits the parameters and the request information by HTTP to the embedded Web server, and the server controls the sensor state according to the user parameters and the field temperature; at the same time, it returns the terminal data back to the browser, for the long-distance user monitoring, in this way it realizes embedded Web temperature control system with B/S structure
The embedded Web server is located at the monitor field, the temperature sensor, heater stick and the LCD monitor and so on communicates with the embedded microprocessor I/O ports
The network chip is RTL8019, the LCD display is SMG240128, the programmable 1-wire Digital Temperature sensor DS18B20 works for temperature Data Acquisition, the data in or out of DS18B20 only to need a single line for read/write, the temperature transformation power originates from the data bus, the main bus itself can supply power to the DS18B20 without external power source
Summary
The DS18B20 passes the data by I/O to the microprocessor, the microprocessor control the heating rod condition pursuant to the parameters and values of field temperature measured; all these data can be displayed on the LCD monitor, as well as the browser. In this way the long-distance temperature monitoring based on B/S structure is realized
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