Week 9 · Microcontrollers

Arduino: digital outputs and inputs (LED, button, buzzer)

In week 5 you lit an LED with a battery. It was always on. Today a tiny computer — a microcontroller — decides when it is on, and reacts to you pressing a button. This is how doorbells, microwaves, traffic lights and robots work.

Electronics, robotics and IoT90 minutesIntermediateLevel 1 module

In this lesson you will

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Explain what a microcontroller is and how setup() and loop() run
Upload a sketch that blinks an LED using digitalWrite and delay
Read a push button with INPUT_PULLUP and digitalRead
Build a doorbell that lights an LED and sounds a buzzer when pressed

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Enrolled students get the complete notes: essential theory, key terms, a step-by-step practical walkthrough, an independent challenge, check-your-understanding questions and the take-home task.

Arduino: digital outputs and inputs (LED, button, buzzer)

In this lesson you will

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