Abstract: Data acquisition system is used to convert analog data into digital format & to store it in digital format. It is widely used in industrial application like controlling temperature, plotting graph, & storing them for further processing from convenient remote location in a form suitable for display and analysis. It is widely used in the automation of any plant like chemical industry, cement industry, in CNC (Computerized Numeric Control) machine tools etc.

Data acquisition system can be made in many ways, for example, using microprocessor, using computer or using micro controller. In these systems data is converted into digital format & can be stored & displayed in many output devices. If it is microprocessor based it can be displayed on seven segment display or LCD (Liquid Crystal Display). If it is a computer based it can be displayed on computer monitor or on plotter.

In our project, computer is used for displaying & storing digital data. Analog signal viz. temperature is given to the circuit. There it is converted to digital signal using ADC 0808. This digital data is transmitted to computer via standard Centronics interface. A program in C is used to convert this data received from parallel port into corresponding temperature. This data is displayed on the monitor of the computer.

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