The core of Qt is a Respberry PI4 plus some other electronics to glue things together also for future development non related to Piwar.
The modified reflector sensor uses two LEDs that are alternatively lit to check if the line is within the width.. that makes the sensor smaller.
The shooter is based on a spring loaded mechanism that is released by melting hot glue with a resistor.. see the videos in the YouTube channel "TheMakingQt"
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