Led
Day 2: Blinking an External LED & Understanding the Breadboard
Day 2 of Learn Coding with Arduino — wire up your own LED on a breadboard, learn why the resistor matters, and blink it from the Uno, not the built-in.
Day 6: Build a Traffic Light System
Day 6 of Learn Coding with Arduino — build a full red-yellow-green traffic light with realistic timing, then add a pedestrian button that overrides it.
Day 10: Project — Smart Night Light
Day 10 of Learn Coding with Arduino — build a night light that switches itself on when the room goes dark, plus a push button so you can override it too.