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Session Number 2526

The Coin Detector Circuit

Nghia T. Le Purdue University

I. Introduction

This paper discusses the design of a Coin Detector Project that utilizes an inductor as an inductive proximity switch. The project covers basic analog/digital circuits that the students have learned during the first two years in the Electrical Engineering Technology Program at Purdue University. Figure 1 below shows the block diagram of the project.

OSCILLATOR

RL ACTIVE PEAK INSTRUMENTATION RESET WHEATSTONE BANDPASS AND AMPLIFIER CIRCUIT BRIDGE FILTER HOLD

VOLTAGE ONE-SHOT COMPARATORS CIRCUITS

DECODER/ DRIVER

PLD

DECODER/ DRIVER

Figure 1 – The Block Diagram of the Circuit

In the ready mode, the circuit shows 00 at the seven-segment displays. When a quarter, a dime, or a nickel passes through the slot, the display becomes 25, 10, or 05 respectively in a two-second period and it then resets itself to 00.

The project consists of different stages that are manageable as weekly classroom activities. It helps the students to utilize their knowledge to design and build a working circuit.

Proceedings of the 2003 American Society for Engineering Education Annual Conference & Exposition Copyright © 2003, American Society for Engineering Education

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Le, N. (2003, June), The Coin Detector Circuit Paper presented at 2003 Annual Conference, Nashville, Tennessee. 10.18260/1-2--12267