8 road input analog signals that digital voltmeter measurement circuit can 0-5 V 8 road input analog signals voltage value, and in the four LED digital display or taking turns on the single option to show. According to the system functions requirements, decided to control system adopts AT89C52 single chip microcomputer, A/D conversion using ADC0809. The system can ensure the request except functions, but also can be convenient to 8 way other A/D conversion amount of measurement, remote measurement results delivery etc function expansion. 8 channel simulation collection of digital tube in the display. Simulation of the value of measurement range is 0-255, second digital tube is used to show which channel, 2 digital tube used to show the simulation of the value of the collection of every second. The channel that switch. This design and channel selection function. There are two key, is a regulation that choose channels and in turn two function conversion, the other is a choice

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8路元器件采购清单.doc

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