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Flexible Prototype Board Design for ADC/DAC Control: Application to Mini-projects.

Samuel Lakeou Ph.D. Department of Electrical Engineering University of the District of Columbia slakeou@udc.edu, (202) 274-5834

I. Introduction

This paper describes the design of a practical prototype data acquisition board and its application to the development of engineering mini-design projects. The mini-projects utilize the design of a prototype board for controlling an 8 or 12-bit analog-to-digital controller (ADC) and an 8 or 12-bit digital-to-analog controller (DAC). The work emphasizes the judicious use of the input/output (I/O) capabilities of an Intel-based personal computer (PC) for providing a very flexible and useful ADC/DAC controller circuit. The controller, which functions as an elementary data acquisition board, is built on an off-the-shelf prototype breadboard, which is installed on an EISA[1] (Extended Industry Standard Architecture), 8MHz @ 8/16/32 bits data bus, 32 bit address, bus slot on the PC. The design allows for flexible use of the signals of the EISA bus for various design applications such as a simple digital proportional-integral- derivative (PID) control system and an ultrasonic ranger and RC Servo control circuit. The various design applications can constitute a series of mini-projects that can be tailored to several courses such as senior project, junior design etc…The ADC/DAC controller was used with a variety of application circuits at UDC. After a description of the controller board, the paper highlights the example of the design of a controller of an Ultrasonic Sonar Transducer and an RC Servo for range sensing application. The paper describes also the versatility of the design as well as its cost effectiveness. It illustrates the ease with which the design can allow students to use their computing skills as well as their hardware design skills. The paper also proposes the implementation of the controller design with a complex programmable logic circuit (CPLD) designed with a very high speed integrated circuit hardware descriptive language (VHDL).

II. Description of the controller circuit.

The DAC/ADC controller board comprises the following circuit components as depicted in Fig. 1:

a) An input/output interface block, which allows bi-directional data movement from the PC to the ADC or the DAC, as appropriate;

Proceedings of the 2005 American Society for Engineering Education Annual Conference & Exposition Copyright  2005, American Society for Engineering Education

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Lakeou, S. (2005, June), Flexible Prototype Board Design For Adc/Dac Control: Application To Mini Projects Paper presented at 2005 Annual Conference, Portland, Oregon. 10.18260/1-2--15422