This paper presents a AT89S51-based and analog-digital conversion chip ADC0809 Data Acquisition System Design and Implementation of the program. Mainly from the hardware circuit design, data collection procedures for the design of two aspects in detail, including some combination of hardware circuit design specific chips, introduced in detail the various parts of data acquisition system hardware interface circuit design. Designed to control the use of 51 single-chip A/D converter sampling constitutes a module, to achieve signal acquisition, sampling data displayed through the LED. This paper is designed and implemented a data acquisition system with a simple, reliable and easy to use, scalability and strong characteristics.

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