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See also: https://wokwi.com (ESP32 equivalent)

[Edit] Which also does Arduino.

I built a small emulator project called Velxio.

A fully local, open-source Arduino emulator. Write Arduino code, compile it, and simulate it with real AVR8 CPU emulation and 48+ interactive electronic components,All running in your browser. GitHub: https://github.com/davidmonterocrespo24/velxio

The goal of this project was to learn more about how emulators work internally: CPU instructions, memory management, and low-level architecture.

It's still experimental, but it already runs basic instructions and I'm continuing to improve it.

What parts have you exactly built?

All I see are dependencies that are glued together with claude.

Can you clearify exactly what you have developed?

Hi HN!

I built Velxio to explore how microcontroller emulators work internally.

It's an Arduino environment that runs entirely in the browser. You can write sketches, compile them with arduino-cli, and simulate circuits using a real AVR8 CPU emulator.

Features: - Arduino Uno / Nano support - Raspberry Pi Pico (RP2040) - GPIO, SPI, I2C, UART, ADC peripherals - interactive electronic components

The goal is to create an open-source environment for experimenting with embedded systems without installing anything.

I'd love feedback from embedded developers!

Thanks for the share, it looks great! Can I load my own OS in rpi?

Did you see that it's an rpi pico, which doesn't really run OSes in the traditional sense?

You are right, when I skimmed through I thought it’s an sbc one. Still very cool, would try it later.

Very cool. I can't wait to play around with this!

This is amazing!