Design of an A/D Data Acquisition Device based on USB

摘要

This paper focuses on the subject of ADC0809 modulus conversion, studying the data of the acquisition device and based on the USB system design of hardware and the software of single chip processor system and PC software design. It firstly introduces a desktop module design, including minimum system circuit design, AD sampling circuit design and the digital tube display circuit design, at the same time, it also be given the link principle of the circuit diagram’s each part, Indicating the corresponding working principle and design idea. Secondly, according to the working principle of RS232 serial port and USB serial bus, the system design is determined. In this design, according to the actual need, the demand parameters, using MAX232 as chip AT89S51 and RS232 interface, based on the analysis of the chip, complete the data transmission between the lower machine and PC hardware circuit design. This design adopted AT89S51 as the core controller and the wide application of USB bus interface, between the lower machine and PC has a convenient bridge, completed the design of hardware circuit of single chip processor system and PC interface circuit and related software design.