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    Serial Hand Raiser blinking colors

    Library Link:

    MMC Project Page


    It’s important to be able to catch the attention of a professor/teacher if you simply need to ask a question. Raising hand is a standard way of getting others attention around the world regardless of the environment and it’s globally used in classrooms. Unfortunately, it may not be possible for everyone to physically raise their hands and we need alternative visual device could help them.

    This device would be beneficial for someone who has difficulty or is unable to raise their hand for an extended period of time.


    The Serial-Hand-Raiser uses a RGB LED to send feedback by flashing colors according to the incoming requests through the USB connection. It uses web serial to communicate with host through a web app. This allows the users to send different colours actions to the device to and display visual feedback to other users.

    The web app can be accessed through following web page:

    Serial-Hand-Raiser App



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