You don’t need the most powerful laser in the US to build a functional scanning microscope, just an old Blu-ray laser diode. An inventor who goes by Doctor Volt managed to do just that with a drive he had laying around. Aside from the laser, the frame, focus coil, and stepper motor were also repurposed for this project.
Doctor Volt then used an ESP32 development board to controls the X and Y axes through motor drivers as well as the laser diode with a voltage regulator. The output is monitored from the sensor through an op-amp that boosts the signal enough for the ESP32’s analog input pin. A computer then displays the custom interface, which enables you to adjust contrast, focus, brightness and scan speed. This scanning laser basically measures light intensity in increments by moving across an object in a grid-like fashion before assembling each individual pixel.
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