Hackaday

Velxio is an open-source, browser-based circuit simulator with programmable logic support that runs locally. Built around Wokwi's AVR8JS library for Arduino simulation, it also supports RP2040 via rp2040js, ESP32-C3 (RISC-V) via RiscVCore.ts, and vanilla ESP32 and Raspberry Pi via QEMU on the backend. Multiple boards can be simulated together, enabling interaction testing between devices. It includes a modern UI with circuit diagram editor, parts selector, and IDE. Sketch compilation uses official Arduino tools on the backend, and the whole stack can be self-hosted with a single docker compose command.

Simulating The AVR8 For A Browser-based Arduino Emulator