Make it FADE (PWM)
// WHAT YOU WILL LEARN
analogWrite(pin, 0–255) on a ~ pin switches very fast (PWM); a for loop raises brightness step by step.
// LESSON NOTES
Part 5: make your LED FADE 🌗 The secret? It's still just ON/OFF — 490 times a second. (And no, pin 13 won't work 👀)
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