StanleyProjects
Documentation: https://stanleyprojects.com/projects/laserprojector_v2/
Source code + Design files: https://github.com/stanleyondrus/LaserProjectorV2
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LaserProjector V2
Battery-powered, ESP32-based laser XY scanner with auto-homing and wireless control
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mr.jb
Catch a Soldering Iron
CarbonCycle
The TMC "Silent Stepper" drivers have collision detection. The pin you are using for optical detection could just hit an object. No extra wiring or devices needed. They stop without doing any damage as current starts to climb - I think.