Arduino & IoT Academy · Lesson

Polling vs Interrupts

Why some events can't wait for the loop.

Always Checking

So far your loop uses polling: it runs around and around, asking each sensor and button over and over whether anything changed.

A typical poll reads a pin every pass of the loop. If the value matches what you want, you react; otherwise you simply keep looping. 🔁

if (digitalRead(buttonPin) == LOW) {
  doSomething();
}