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The effects of perceived USB-delay for sensor and embedded system development.

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    Users found input delays up to 150 milliseconds (ms) acceptable for computer devices. Delays exceeding 300 ms were consistently unacceptable, highlighting critical thresholds for user experience in systems like healthcare applications.

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    Area of Science:

    • Human-Computer Interaction
    • Usability Engineering
    • Embedded Systems

    Background:

    • Input device delay is a significant issue, particularly in sensitive applications like healthcare and within resource-constrained embedded systems.
    • Determining acceptable delay thresholds is crucial for effective human-computer interaction and system design.

    Purpose of the Study:

    • To investigate and quantify the acceptable delay perception for computer input devices.
    • To establish time limitations for USB data processing in microprocessors and embedded systems based on user feedback.

    Main Methods:

    • Development of a specialized device to benchmark perceived input delay (0-999 ms).
    • User testing with 36 participants evaluating delays between a computer and USB input devices (mouse, keyboard).
    • Specific tests focused on common computer mice and delays ranging from 0 to 500 ms.

    Main Results:

    • User tests indicated that perceived delays up to 150 ms were generally acceptable.
    • Delays greater than 300 ms were consistently perceived as unacceptable by participants.
    • A clear range for acceptable input delay was identified, informing system design.

    Conclusions:

    • The study provides empirical data on user perception of input device latency.
    • Findings are critical for optimizing performance in healthcare technology and embedded systems.
    • Recommended delay thresholds can guide the development of more responsive and user-friendly interfaces.