---
title: "Discussion on \"How Does an Arduino Actually Work? From Your Sketch to One Pin Going HIGH\" | Hashnode"
description: "Discussion on \"How Does an Arduino Actually Work? From Your Sketch to One Pin Going HIGH\". What happens between digitalWrite(13, HIGH) and 5 V on a pin: the compiler, the upload, the bootloader, the ATmega328P, and the one bit in one register that does it."
url: "https://hashnode.com/posts/how-does-an-arduino-actually-work-from-your-sketch-to-one-pin-going-high/6af41250ca39a8bd72dfe9ee"
---

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# [How Does an Arduino Actually Work? From Your Sketch to One Pin Going HIGH](https://digicirq.hashnode.dev/how-does-an-arduino-actually-work-from-your-sketch-to-one-pin-going-high?utm_source=hashnode&utm_medium=feed)

What happens between digitalWrite(13, HIGH) and 5 V on a pin: the compiler, the upload, the bootloader, the ATmega328P, and the one bit in one register that does it.

1h ago · 6 min read · digicirq.hashnode.dev  
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-   [#arduino](https://hashnode.com/tag/arduino)
-   [#embedded-systems](https://hashnode.com/tag/embedded-systems)

## Written by

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Electronics, explained one circuit at a time. Written guides to every DigiCirq video.

DigiCirq is a faceless, diagram-only channel: short animated explainers on how electronics, Arduino, microcontrollers and the apps on your phone really work. Each post here is the written guide to one video, with the numbers worked out and something to try on your own bench. Videos: youtube.com/@digicirq

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