Exercise 2: Breadboards and Blinking an External LED

Arduino Basics Course · Exercise 2 of 5

In Exercise 1 we blinked the Uno’s built-in LED with zero wiring. This exercise takes the next real step: building your first circuit on a breadboard and blinking an external LED through a resistor — the same loop you already know, now with real wiring and real Ohm’s law behind it.

Full write-up coming soon

We’re finishing the step-by-step walkthrough, wiring diagram, and real breadboard photos for this one — check back soon, or follow along with Paul McWhorter’s “Arduino Tutorial 3: Understanding How Breadboards Work” in the meantime.

In this course

1. Exercise 1: Blink the Built-In LED (No Wiring Needed) — live now
2. Exercise 2: Breadboards and Blinking an External LED — you are here
3. Exercise 3: Reading a Pushbutton — coming soon
4. Exercise 4: Understanding Arduino Variables — coming soon
5. Exercise 5: Binary Numbers and an LED Binary Counter — coming soon

← Previous: Exercise 1 • Course Index • Next: Exercise 3 (coming soon)