What you'll build
Make an LED blink in a steady rhythm — your first program loop.
Before you start
You'll learn: Using loop() with digitalWrite() and delay() to make a rhythm that repeats forever.
You'll finish: An LED on pin 13 blinking on and off every half-second, non-stop.
Real world: Heartbeat monitors, alarm beacons and bicycle lights all repeat a timed rhythm like this.
Then try: Code the rhythm of a siren, or a slow pulse to show a water pump is resting.
Who does this: Electronics technician — TVET diploma in electronics or electrical engineering.