Just describe your idea. Codey writes the code, draws the wiring diagram, compiles it in the cloud, and uploads it straight to your board — all from one browser tab. No IDE, no driver hell, no setup.
Codey is a complete IDE in your browser, packed with the tools that actually matter when you're prototyping with Arduino or ESP32.
Tell Codey what you want to build. It writes complete Arduino & ESP32 sketches, libraries, and helper files for you in seconds.
Codey draws a clean, color-coded wiring diagram of your project — so you know exactly which pin goes where before you grab a single jumper wire.
Forget the heavy Arduino IDE. Compile in seconds on our servers — no toolchains, no SDKs, no updates to install.
Flash your board straight from Chrome or Edge over Web Serial. AVR boards, ESP32 WROOM, S3 and C3 are all supported with auto-reset.
A built-in serial monitor with adjustable baud rate, auto-scroll, and an input line — debug your hardware without ever leaving the browser.
Compilation failed? Codey reads the error log, fixes the syntax, missing includes or wrong API calls, and recompiles automatically.
Codey knows which library each sensor needs. Drop in a DHT11 and it picks DHT sensor library; mention an SSD1306 OLED and it grabs Adafruit_SSD1306. You describe the goal — Codey handles the includes.
Real projects, not single sketches. Work with .ino, .h, .cpp and config files in a tabbed editor with syntax highlighting and linting.
Save versioned snapshots of your code with one click. Roll back to any milestone — code and chat history are restored together.
Codey actively guards 3.3V vs 5V compatibility. It warns you when a 5V sensor like the HC-SR04 needs a level shifter on an ESP32, before things smoke.
Switch between three reasoning modes: Agent writes & edits code, Plan drafts a step-by-step plan first, Ask answers without touching files.
Drop in a photo of your breadboard, schematic or component and Codey can read it — perfect for "what is this sensor?" or "is this wired correctly?".
Open a kit URL and Codey already knows which board and components you have. Great for classrooms and ready-made learning paths.
A complete in-app manual is one click away. Stuck on something? Email codey@otronic.nl and a real human will help.
Library installs are a thing of the past. The most popular Arduino & ESP32 libraries — Adafruit GFX, FastLED, ArduinoJson, WiFiManager, ESP-NOW, NeoPixel, Servo, Wire, SPI and many more — are pre-installed on our compile servers. Just write #include and it works. No ZIPs, no version conflicts, no waiting.
Every Codey project comes with a real wiring diagram. Color-coded wires, labeled pins, and a complete connection table — exportable as PDF or printed straight from your browser.
Red for 5V, black for GND, signals in distinct colors — exactly how you'd draw it on paper, only neater.
Below every diagram you get a Wire From → To list with pin labels, so you can wire your circuit without guessing.
One click to download a printable PDF of the diagram — handy for workshops, classrooms or your own build log.
Codey ships with a library of common modules: OLED displays, DHT11/22, HC-SR04, servos, relays, MOSFETs, RGB LEDs and many more.
Codey works out of the box with the most popular development boards. Plug one in over USB, pick it from the dropdown, and start vibing.
The classic. ATmega328P @ 16 MHz, 14 digital I/O, 6 analog inputs. Perfect for beginners.
Compact ATmega328P board. Same brains as the UNO, breadboard-friendly form factor.
54 digital I/O and 16 analog inputs. The go-to when one UNO simply isn't enough.
The popular WROOM-32 module. Dual-core 240 MHz, Wi-Fi + Bluetooth, 30 GPIO.
Beefy S3: 16 MB Flash, 8 MB PSRAM, native USB-CDC. Two USB ports — Codey knows which is which.
RISC-V single-core, ultra-low-power, USB-C and a built-in OLED. Tiny but very capable.
More boards added regularly. Direct USB upload over Web Serial — no drivers, no Arduino IDE required.
If you love vibe coding with Cursor or Claude Code, you'll feel right at home in Codey. Same describe-it-and-it-builds flow — except Codey runs your code on a real Arduino or ESP32, not on a server.
| Capability | Cursor | Claude Code | Codey Online |
|---|---|---|---|
| AI vibe coding | ✓ | ✓ | ✓ |
| Multi-file projects with context | ✓ | ✓ | ✓ |
| Lives where? | Desktop IDE | Terminal CLI | Browser |
| Built specifically for embedded | — | — | ✓ |
| Cloud compiler for Arduino & ESP32 | — | — | ✓ |
| Direct USB upload (Web Serial) | — | — | ✓ |
| Auto-generated wiring diagrams | — | — | ✓ |
| Live serial monitor & debug | — | — | ✓ |
| Smart Arduino library installer | — | — | ✓ |
| 3.3V vs 5V safety checks | — | — | ✓ |
| Starter kits for makers & classrooms | — | — | ✓ |
| Best for | Web, mobile, backend | Scripts, refactors, ops | Arduino & ESP32 firmware |
Cursor and Claude Code are excellent general-purpose AI coding tools — we use them ourselves. They're just not made for blinking an LED on a microcontroller. Codey Online fills that gap. Cursor® is a trademark of Anysphere Inc.; Claude™ and Claude Code™ are trademarks of Anthropic PBC. Not affiliated with either company.
Start vibing for free. Upgrade for unlimited AI and pro power.
For students and hobbyists.
For makers and creators.
Codey Online is built by OTRONIC, a Netherlands-based electronics company. We're passionate about making hardware programming accessible to everyone — from primary-school kids to professional firmware engineers.
We saw too many beginners give up on the traditional Arduino IDE because of driver issues, missing libraries and cryptic C++ errors. Codey closes that gap with modern AI and Web Serial — so you can stay in the flow and just vibe your way to a finished project.
Questions, feedback, or feature requests? Mail us at codey@otronic.nl.