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FastLed cause program stop functioning #792
i am using Arduino nano & tested with Uno too, using FastLed library.
It's hard to say without seeing what the rest of your code is like. It's possible you're running into issues with interrupts. It's possible you're running out of memory. It's possible that you have a memory corruption issue somewhere that's corrupting memory only used by FastLED, so when you comment out the addLeds line FastLED is effectively not doing anything, and therefor not hitting it.