Answer5

THE MAGAZINE FOR COMPUTER APPLICATIONS Circuit Cellar Online offers articles illustrating creative solutions and unique applications through complete projects, practical tutorials, and useful design techniques.

	WHAT'S YOUR ENGINEERING QUOTIENT?
•What's the Count? Problem 5—If the resolution of an encoder wheel is N stripes per revolution, what is the maximum encoding resolution when the wheel is encoded by a quadrature encoder? Answer: 4N per revolution. This is because there are a total of four distinct edge combinations when the wheel is encoded by a quadrature encoder regardless of the direction of rotation. Let the two channels be A and B, then the four distinct edge combinations (per 1/N revolution) are: A rising edge, B level A level, B rising edge A falling edge, B level A level, B falling edge 1-00 For questions or comments about Test Your EQ, e-mail eq@circuitcellar.com.