In the Wikipedia page there’s this formula

Just plug in values for the fence voltage and led. You can just set vswitch to 0 and Vled to 2V. It should be fairly insignificant compared to the fence voltage. It should be 10-20mA (0.01-0.02) to not kill the led.

The root of this is Ohms law: V=IR. Diodes cause a voltage drop rather than directly acting like a resistor which is why it’s subtracted from the input voltage.

Just put them in series. Make 2x, one in each direction to account for AC and DC

Id wager that they dont put too much money into R&D and just pay one guy to port over the same code from their last last last generation printer to the new one. Over time its become an unrecognizable mess that is just hacked into working and no one ever takes a look under the hood. Their main market is the ink anyways, so making the printer good at what it does is an afterthought

The south park “cut a chicken’s head of and see where it stops running”;

Hmm, Im in dark mode but it might be because of OS settings

ETA: settings on the left, look and feel, theme

No dedicated toggle button but I personally always use dark mode