Data acquisition system

Abstract

In this study several analog to digital converter systems are described and their advantages and disadvantages are told. Among them,a successive approximation type one is designed and buit.To obtain flexibility, it is designed as a bus compatible device.Also device addressing is used, by use of which, more similar devices will be able to be connected to the bus. The bus is so designed that it is not possible for more than one pair of devices to be active on it at any time.The system also has analog multiplexing facility which selects one of eight analog inputs.This selection can either be done by the peripheral device or by the system itself, according to the information on the bus. Output of the system is 12 bits, in addition to the parallel output, serial output with preselectable baud rate is put for long distance communication. The results obtained are quite satisfactory in performance.