Abstract
This paper is mainly used for data acquisition system AVR chip design, design of data acquisition, data acquisition, data processing of three major modules. Then according to the three modules of each module of the function of specific design, data acquisition module has conducted a signal conversion, analog signal amplification. The data sampling module is divided into A / D conversion, isolation, microprocessor control. In the data processing carried out on data display and storage, data transmission communication with PC port。
The design useless ATMEGA128 from the AVR series single-chip, AD620amp, PS2815-4 isolation chip etc to realize three signals applied in the Temperature ,humidity, lighting,analysis. It use ATMEGA128to realize the control, RS232 and RS485 to transport the data, A to display in LCD and to save.
Keywords Data Acquisition, AVR Single-Chip microcomputer,ATMEGA128