A novel signal processing circuit for contactless motion detection

Arfan Ali, David K. Potter

    Research output: Contribution to journalArticlepeer-review


    This paper presents a novel electronic circuit to determine the speed and direction of motion of a trackball through a non-contacting motion detection mechanism. The trackball comprises of a ball and a pair of electromagnets made of magnetic grade stainless steel material. The electromagnets, placed substantially orthogonal to each other, record the magnetic information onto the ball surface. The electronics described herein make use of the Hall sensors which act as reading heads to retrieve the magnetic information off the magnetized ball surface. The signals generated by the Hall sensors are then acted upon by logic and analog circuits to convert the ball motion into the X and Y components of the cursor position on the screen. The new circuit ensures motion detection even in harsh environments and hence overcomes the limitations faced by existing trackballs. © 2009 Elsevier B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)173-177
    Number of pages5
    JournalSensors and Actuators A: Physical
    Issue number2
    Publication statusPublished - Feb 2010


    • Contactless motion sensor
    • Hall sensors
    • Interface electronic circuit


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