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Velxio: Test IoT Code

Name: Velxio: Test IoT Code
Author: davidmonterocrespo24

Write and run code on 19 boards without hardware. For founders working with Arduino, ESP32, and Raspberry Pi, backed by 2.1k+ GitHub stars.

2,083 stars192 forksTypeScriptQuality 9/10Updated 6/2/2026100% free · open source

What it does

Velxio allows you to write, compile, and run code for various microcontroller boards like Arduino, ESP32, and Raspberry Pi directly in your browser without needing the physical hardware

When to use it

•When testing and debugging code for IoT or automation projects without wanting to set up the physical hardware
•When learning or teaching programming for microcontrollers without the need for actual devices
•When rapidly prototyping or validating code ideas for embedded systems projects

Quick start

1Visit the Velxio website and select the board you want to emulate from the 19 available options
2Write or paste your code into the Velxio editor, using languages like TypeScript for automation tasks
3Compile and run your code to see how it would behave on the actual hardware, all within the browser
4Join the Velxio Discord community for support and to share your projects with others

Ready-to-paste prompt

Let's try a basic blinking LED example for Arduino Uno: `const int ledPin = 13; void setup() { pinMode(ledPin, OUTPUT); } void loop() { digitalWrite(ledPin, HIGH); delay(1000); digitalWrite(ledPin, LOW); delay(1000); }`