Arduino and 3D Printer opto-sensor

I was recycling one of the opto-sensors parts of the printers I took apart.
I am using the input of the Arduino to check if I can reuse them:


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3D Printer – Working with the power supply

ATX power supplies turn on when the terminal (P-ON – Green Cable) are connected to ground.
Using the stand-by terminal to supply +5V to this circuit, I can turn it on and off by using the push button that comes with the desktop tower.

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