(Arduino) Core Logic of Non‑Blocking

Non‑blocking code lets the microcontroller perform multiple tasks simultaneously without freezing during a delay(). Instead of waiting, it checks time with millis(), keeping the loop responsive. This allows smoother button handling, sensors, displays, or communications to run together. It makes projects more efficient, interactive, and scalable, especially when managing several events or devices in real‑time.

Core logic of a non‑blocking Arduino pattern

Debounce logic

• Every time the button input changes, it records the current time (millis()).

• Only after a stable period (DEBOUNCE_DELAY) does it confirm the press.

• This avoids false triggers from mechanical button bounce — and all without blocking the CPU.

Sample Code 1

Sample Code 2

Sample Code ３

Scenario: When button A0 is pressed, the LED on A1 turns on for 3 seconds.

Scenario:  If button A2 is pressed during that time, the LED turns off immediately.