The gap between a working simulation and a blinking physical LED has always been software installation. You simulate a circuit online, but to actually build it, you still have to download the Arduino IDE, configure the board manager, and find the right settings.
CircuPilot now bridges that gap. Simulate your Arduino circuit, compile the code, and upload it directly to a real Arduino board from your browser — without installing Arduino IDE.
How Web Serial makes it possible
Modern browsers (Chrome, Edge, Opera) support the Web Serial API, a secure way for websites to talk directly to USB hardware. When you plug in an Arduino, the browser can connect to its onboard serial-to-USB converter (like the CH340 or ATmega16U2).
Here is what happens when you press the new "Upload to board" button:
1. CircuPilot sends your code to our compiler, which runs real avr-gcc and returns a compiled .hex file.
2. The browser requests permission to access your Arduino's USB port (you only approve this once).
3. CircuPilot resets the board and speaks the STK500v1 protocol over Web Serial, flashing the hex file byte-by-byte straight into the ATmega328P's memory.
The upload process is designed to complete in seconds, and nothing is installed on your computer.
Simulation first, hardware second
The most common question beginners ask when a physical circuit fails is: "Is my code wrong, or is my wiring wrong?"
By keeping both steps in the same environment, you answer that question instantly. Before uploading, you press Run to start the built-in AVR emulator. If the virtual LED on the canvas blinks but the physical one does not, your code is fine — check your breadboard wires and resistors.
| Feature | Arduino IDE | CircuPilot |
|---|---|---|
| IDE Installation | ~500 MB download | None (Browser-based) |
| Board Selection | Manual FQBN/Port selection | Auto-detects Uno/Nano |
| Simulation | None | Built-in cycle-accurate AVR emulator |
| Compilation | Local | Cloud (avr-gcc) |
Perfect for classrooms and quick tests
If you teach electronics, spending the first two hours of a lab session troubleshooting IDE installations and library versions is a familiar pain. With Web Serial upload, students can open a shared circuit link (app.circupilot.com/c/...), read the pre-written code, simulate it, and flash it to their desk's Arduino in under a minute.
It also supports older Arduino Nano clones directly — just check the "Old Bootloader" option before uploading to switch to the 57600 baud rate they require.
Try it right now
Grab an Arduino Uno or Nano and a USB cable. You do not need to install anything.
---
⚡ Code, Simulate, and Upload
Tell the AI what you want your Arduino to do, watch it run in the simulator, and then click Upload to board to flash it to your real hardware. Free, no signup required.