/diy/ - Do It Yourself

>>2699011
>No idea how to control one with an arduino
Pic related. In this case you don't need voltage feedback, but I probably would do temperature feedback just by slapping a thermistor or whatever on the cold side and increasing or decreasing the duty-cycle to keep it roughly constant. That way instead of setting it to 25%, 50%, 75% or 100% power, you'd set it to 10°C, 5°C, 0°C, -5°C as an example. That way it wouldn't be influenced by ambient temperature as much. Though if you're doing something where thermal power matters more than absolute temperature you might prefer to stay open-loop, or even add a different feedback loop by calculating effective peltier power level. But open-loop (no feedback) is still perfectly usable.

>>2699185
You'd be an antisocial ass. Unless you were doing it for killing bacteria and viruses, then you're a covid hero (even though we've known since 2020 that the virus doesn't spread from countertops). If you use UVB LEDs then you can say you're just giving indoorsy people enough vitamin D to bolster their immune system (you'll be arrested for spreading malinformation).

I think Big Clive has a story about people putting mercury UVC lamps in a nightclub for their cool glow and giving people sunburnt eyes. UVC is nasty shit, man.