NexSim is a browser-based platform offering Online Circuit Simulation + MCU Simulation + Cloud IDE + Instrument Toolkit. Inspired by Wokwi, NexSim features a modernized architecture, rich extensibility, and a dual-form structure capable of running both in the cloud and on dedicated hardware teaching platforms.

No software installation required. Open your browser and start using it immediately. This is the core experience of NexSim.

• avr8js Integration: AVR/ATmega (Arduino) simulation.
• rp2040js Integration: Raspberry Pi Pico / RP2040 simulation.
• Future Support: ESP32 (QEMU WebAssembly), ARM Cortex cores.
• Hybrid Mode: Supports Frontend WASM + Backend Python-QEMU mixed simulation.

• Integrated browser code editor (Monaco / Codemirror).
• Syntax highlighting, auto-completion (LSP optional).
• One-click Compilation: Auto-load simulation kernel.
• Built-in Serial Terminal / Log Output / Debug Interface.

• Konva.js Based: A generic, drag-and-drop circuit canvas providing a "Pro EDA" experience similar to Altium Designer.
• Features:
  • Drag & Drop components: LEDs, Buttons, Sensors, Displays, etc.
  • Pin Connections -> Auto-generate Netlist.
  • Visualized Device Properties & Interaction.
• Extensible: Devices are driven by TypeScript/Svelte components.

• Consistent JSON protocol across Web IDE ↔ Bun Backend ↔ Python Simulator.
• Covers: Pin states (pins), Serial messages (serial), Device events (button press), and Simulation control.

• Core Services: User Projects (Save/Share), Compilation Service (avr-gcc/pico-sdk), WebSocket Hub.
• Database: Prisma ORM + SQLite/PostgreSQL.

• Built with FastAPI.
• Provides NEXsim-Core MCU engine (QEMU/Renode) for complex SOCs (e.g., ESP32).
• Compatible with Wokwi API.

Deployed on the proprietary Nex-Modules platform, a system based on ARM SBCs + Pluggable Modules.

"Pack an entire electronics lab into a backpack — Grab and Go."

• Sensor Modules: Physical sensors integration.
• IO Modules: LED, Button, Motor, Buzzer.
• Instruments: Digital Oscilloscope, Logic Analyzer, Adjustable Power Supply.
• Debuggers: gdb, jlink, daplink, jtag.
• Tools: JBC Soldering Station Control, LCR Meter, I²C/SPI/UART Sniffers.

• Virtual MCU ↔ Physical Sensors: Code running in browser controls real sensors.
• Physical MCU ↔ Virtual Devices: Real chips control virtual LEDs/Screens.
• Use Cases: Rapid Prototyping, Lab Classes, Teaching Demos, Competitions.

• All physical hardware is abstracted via HDAL.
• Fully compatible with sim-protocol, ensuring consistency between Cloud and Module versions.
• Supports Hot-Swapping of modules.

• Access the NexSIM Web IDE directly from the ARM board via a local network.
• Low latency, ideal for offline labs or classrooms.

graph TD
    subgraph Frontend [Web Frontend]
        A[SvelteKit + SvelteFlow]
        B[Web Editor + UI]
    end

    subgraph Backend [Backend]
        C[Bun + ElysiaJS + Prisma]
        D[Auth / Project / Compiler / WS Hub]
    end

    subgraph Sim [Python Simulator]
        E[FastAPI + MCU Engines]
        F[QEMU / Custom Core / Extensions]
    end

    Frontend <-->|sim-protocol \(WS\)| Backend
    Backend <-->|Cloud / Local| Sim