Could someone give me an idea of the quantity of WS2812b LEDs that can

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Could someone give me an idea of the quantity of WS2812b LEDs that can be addressed by FastLED on an Arduino Nano, please? I know that it is dependent on the RAM of the Arduino, but I can’t find any clear-cut details about the limits.
My current project will have 240 LEDs. Possible? Thanks

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Each LED requires at least 3 bytes. One byte for each of the R, G & B color components. 3 x 240 = 720 bytes. Then you’ll need to add the RAM required by the FastLED library, your sketch, and any other libraries you use.

Even without any hardware, you can select your board, compile a sketch in Arduino and it’ll tell you how much RAM and Flash it’ll require.

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Thanks, Jason

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If you want a tiny but significant bit of extra headroom, look for Atmel 32u4-based boards (like the Arduino Leonardo or DFRobot Beetle). These have 2.5k of RAM, a crucial 512 bytes (or, to think about it another way, 25%) extra.

I’ve successfully run 768 pixels off one. I wouldn’t recommend it, but it’s possible.

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I’ve run Demo Reel with 240 LEDs on a Nano with external power.