Your first real project — blinking an external LED on pin 13. What the Uno is and how it works, writing and uploading a sketch, why pin 13 has an onboard LED, and testing it live.

Objectives: Describe what the Uno does · Write and upload a sketch · Wire an LED with a current-limiting resistor · Use pinMode(), digitalWrite(), delay()

Components: Arduino Uno · LED · 220Ω resistor · breadboard · jumper wires