As part of my VG-L7X Engraver project I have been thinking about optical measurements.
I found an optical sensor and a module for that sensor. As usual there either are no schematics or confusing ones available.
It’s a pretty simple PCB so I created a schematic: https://www.digikey.com/schemeit/project/opt101-module-5f5bfbe080b24f45a4dbe1bf695e7914
You can also see what I am tinkering with here: Don's Laser Cutter Things: Design Phase: Diode Engraver Relative Power and Focus Measurement