WLED power limit for FCOB strip (lemmy.world)

submitted 1 day ago by ApplyingAutomation@lemmy.world to c/homeassistant@lemmy.world

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Pardon a WLED question in the Home Assistant community, but I was unable to find a WLED community in the fediverse.

Regardless, I have this 720 LED/meter FCOB strip, which is 24v strip & I'm trying to figure out what to configure the "LED voltage (Max. current for a single LED):"

Since it's a 20IC per meter & they claim 21watts per meter that comes out to ~1w per IC. But I'm unsure how that converts to mA like WLED is asking for.

Any advice would be greatly appreciated 🤠

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[-] jjffnn@feddit.dk 6 points 1 day ago

If i'm understanding your question, what you're looking for is Ohm's law
Amp = watt / volt
1 / 24 = 0.042
You want milliamps, so multiply by 1000 giving you 42mA per IC

[-] ApplyingAutomation@lemmy.world 2 points 1 day ago

Thank you!

I guess the second part of my question is I want to confirm that WLED says "per LED" they really mean "per IC".

[-] jjffnn@feddit.dk 2 points 1 day ago

I'm happy to help.

I don't know much about WLED, but from the other comments here it would appear so. And i think it's also what makes the most sense.

[-] ShepherdPie@midwest.social 4 points 1 day ago

Yes that's correct. Same goes for the normal WS2811 strip lights which are addressable every 3 LEDs.

[-] Tolookah@discuss.tchncs.de 3 points 1 day ago

Yes, they understand an led as a thing they can control. I have an analog strip that is one LED

[-] acockworkorange@mander.xyz 3 points 1 day ago

It bothers me that the setting is called LED voltage but refers to current. But at least it refers to current, because controlling the voltage to power an LED is a recipe for a burnt out LED.

[-] Courantdair@jlai.lu 2 points 1 day ago

Bothers me as well, time to contribute and open an issue! I've never installed WLED so I won't be able to describe where this setting is and give more information but I invite you or OP to do it

[-] ShepherdPie@midwest.social 1 points 1 day ago

This is a weird setting that must be in some brand new release because I've been using WLED for years and it's always just been a current limiter for the entire strip. Perhaps it has something to do with OP using COB lights as I've only ever used it for standard strip lights like 5050 WS2812B or 5050 WS2815.

[-] Tolookah@discuss.tchncs.de 2 points 1 day ago

It's near the current limiter setting, it's in 0.14.0-0.14.4 at least (Sample size two boards, one that needs updating). It's how wled estimates how much current each LED takes

[-] swizzlestick@lemmy.zip 1 points 1 day ago

https://www.rapidtables.com/calc/electric/Watt_to_Amp_Calculator.html

this post was submitted on 14 Nov 2024

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