温度传感器信号采集系统设计英文文献翻译_毕业论文.doc

Research of Intelligent Gas Detecting System Detecting system in this paper adopts single-chip microcomputer as control computer;the overall schematic diagram of system is shown in Figure 1. The reason for selectingsingle-chip microcomputer as a control core is that it possesses advantages of smallsize, high reliability, low price which made it very suitable to be used in industries ofintelligent instrument and real time control .The operating interface of system is shown in Figure 1. Number at upper right cornershows the default or user-defined gas concentration value, number at upper left cornershows detected gas concentration value. One alarm lamp is equipped. All functions arecontrolled by keys arranged on the control panel, including POWER key, RESET key,DATA COLLECTION key. Other keys including ten number keys, ADJUST VALUEkey and ENTER key are used to change threshold values Fig.1 The operating interface of system Basic operating procedures are as follows:Firstly press POWER key, the system initialized.Press DATA COLLECTION key, LED at upper right corner displays the threshold value 1.00; User can customized threshold value by press ADJUST VALUE key and ten number keys, then press ENTER to confirm the change.System starts to detect gas concentration and display these parameters on upperleft LED area, at meantime transmit real-time data by RS-485 to host computerabove ground. The Hardware architecture of system mainly including main control unit, sensors andsignal amplifier circuit, A/D converter module, sound-light alarming circuit, keyboardand display module, serial-communication module. Featured by high integration level, small size and low prices, Single chip microcomputer has been widely used in a broad range of industrial applications including process controlling, data collection, electromechanical integration, intelligent instrument,household appliances and network technology, and significantly improved the degree of technology and automation. Fig.2