Rangkai is an online Arduino simulator that brings breadboards, components, and Arduino into the browser. Create a personal account, build and program with blocks or C++, and watch the simulation run instantly. Made for learners, hobbyists, and anyone curious about electronics. Teachers can run classes too.
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Drag an Arduino, breadboard, LEDs, buttons, servos, joysticks, keypads, and even motion, temperature, and gas sensors onto the canvas, then wire them up. The circuit behaves like the real thing: LEDs light up, servos turn, buttons can be clicked.
Beginners snap together plain-language blocks like "if button pressed, turn LED on". The C++ code generated from the blocks is always shown alongside, and can be switched to text code once you are ready.
The level sets which components are in the palette, whether you use the block or code editor, and the style of messages. Beginners get friendly, simple messages, the Intermediate level gets technical messages and the Serial Monitor, and the Advanced level unlocks multiple C++ files. Move up whenever you are ready.
Teachers create a class with a 6-character code, give open-ended or block puzzle assignments, then open student submissions right in the simulator to grade them. Students see grades and comments right away.
Open an example, change its blocks or code, then press Run.
Rangkai is a free online Arduino and electronics simulator that runs in your browser. Build circuits with LEDs, resistors, buttons, sensors, and dozens of other parts on a virtual breadboard, program them with blocks or C++ code, and watch the simulation run instantly.
Yes. Every part lives in the simulator, so you don't need to buy an Arduino board, breadboard, or wires first. The code you write is real Arduino code, so you can use it on a physical board later.
Arduino Uno, Arduino Nano, Arduino Mega, and the ESP32-C3 SuperMini, plus breadboards, resistors, diodes, transistors, and batteries.
Free, with no ads. Rangkai runs in any modern browser on laptops, Chromebooks, tablets, and phones, with nothing to install. You can also try example projects without signing up.
Yes. There are four levels: Beginner and Basic use the block editor (Beginner with picture passwords for primary school), Intermediate uses C++ code, and Advanced is for projects with several files. You can switch levels any time.
Teachers create a class, share the class code, and set assignments with a starter project and allowed parts. The Share assignment button prepares a ready-to-send WhatsApp message with the site address and class code.
Sign up free. Your projects are saved to your account, so you can pick them up any time on any device.