[ LAB_ONLINE ] // FREE_FOR_NOW
Build electronic circuits from real parts right in your browser, write the program and watch it come alive — no board and no Arduino IDE needed. The helper designs a project from the parts you own and explains every wire, and the finished program can be uploaded to a real Arduino over USB.
// HOW_IT_WORKS
Like a real workbench with a soldering iron — except nothing burns out or gets lost.
Drag an Arduino, sensors and LEDs onto the 3D bench and pull wires with the mouse. Wire directly or through a breadboard — one click switches between them.
Real Arduino code (C++) with hints and ready-made snippets. Not sure where to start? The helper will come up with a project from your parts.
The emulator runs your program instruction by instruction: LEDs blink, the screen prints, the servo turns. When it works — upload it to a real board over USB right from the browser.
// FEATURES
Not a picture and not an animation: a real Arduino processor runs inside.
// EMULATOR
The ATmega328P (UNO, Nano) and ATmega2560 (Mega) are emulated faithfully — timers, PWM, ADC, interrupts and the serial monitor included. That is why real libraries work: Servo, LiquidCrystal, Adafruit NeoPixel.
// AI_HELPER
Tell it what is in your kit and what you would like to make — the helper suggests a project, builds the circuit on the bench, writes the program and explains in plain words why every wire is there. If something is missing, it tells you what to buy.
// BREADBOARD
“Direct” mode runs wires from each module straight to the Arduino pins. “Breadboard” mode lets the Arduino power the + and − rails and the parts take power from there, just like on a real bench. Any project switches with one click.
// USB_UPLOAD
Plug the board in with a USB cable, press “Connect” and “Upload” — the program is compiled on the server and sent to the board with the same protocol the Arduino IDE uses. UNO, Nano (including clones with the old bootloader) and Mega 2560 are supported.
Take a picture of a module — the lab finds its pinout and puts it on the bench.
Sensors, displays, motors and shields with pinouts and hints.
Run two Arduinos at once and let them talk over 433 MHz radio.
Send a project to a friend or teacher — it opens for them complete.
With an account your projects and settings are saved and open on any device.
First wire, first program, a breadboard build, two boards at once — collect the badges.
// PROJECTS
Each one opens in the lab with a single click: build it step by step or run the finished circuit right away.
UNOYour very first project: an LED turns on and off every half second.
Open in the lab →
UNOWhile you hold the button, the green LED is on. Press the button with your mouse right on the model!
Open in the lab →
UNOA real traffic light: it stays green until someone presses the crosswalk button. Then it turns yellow, then red, and then green again.
Open in the lab →
UNOTurn the potentiometer and the LED smoothly gets brighter or dimmer. You can see the number in the Serial Monitor.
Open in the lab →
UNOJust like in a car: the closer an object gets to the distance sensor, the faster the buzzer beeps. Move the "Distance" slider.
HC-SR04Open in the lab →
UNOWhen the room gets dark, the night light slowly turns on all by itself. Move the "Light level" slider.
Open in the lab →
UNOThe addressable LED strip shines with all the colors of the rainbow, with a different color on every LED.
WS2812Open in the lab →
UNOThe LCD shield plugs onto the Arduino. The screen shows a greeting, a stopwatch and the name of the button you press.
shieldLCD 1602Open in the lab →
UNOThe flame sensor sees fire, the siren wails, the relay turns on the "pump" (a lamp), and an alarm message shows up in the Serial Monitor.
Open in the lab →
UNOLearn to use a breadboard: an LED and a resistor with no modules. You will need a regular LED and a 220 Ω resistor (they cost almost nothing).
Open in the lab →
UNOTurn the encoder (use the mouse wheel over the knob) and the number goes up or down. Press the knob to reset it.
Open in the lab →
UNOA moisture sensor sits in a flower pot. When the soil is dry, the red LED blinks and the buzzer beeps. When it is wet, the green LED is on.
Open in the lab →
UNO + NanoTwo Arduinos with no wires between them! The Nano with a button is the doorbell remote: press the button and a code flies over 433 MHz radio. The UNO with a receiver catches the code and rings "ding-dong". Each board has its own program: switch between them with the buttons above the code.
2 boards433 MHz radioOpen in the lab →
UNO + NanoTurn the knob on the Nano, and the color of the LED strip connected to the UNO changes by radio. A real wireless remote!
2 boards433 MHz radioWS2812Open in the lab →
UNOThe strip "dances" to sound: the louder the room, the more lights turn on and the faster the rainbow runs. Move the noise slider or press "Clap".
WS2812Open in the lab →
UNOThe shield with the red display plugs onto the UNO. S1 starts and stops, S2 resets. While it counts, the D1 LED is on, and the buzzer gives a short beep every time you press a button.
shieldOpen in the lab →
UNOWith the Sensor Shield, each module connects with one 3-wire cable: G to G, V to V, S to S. The motion sensor goes on group 2, the buzzer on group 8 and the LED on group 13.
shieldOpen in the lab →
NanoThe Nano sits in the red shield, and the modules connect in G-V-S groups. When it gets dark, the LED slowly turns on.
shieldOpen in the lab →
MegaThe Arduino Mega has 54 digital pins and 16 analog ones! Six LEDs on pins 22–27 (the UNO does not have these) light up one after another, and the knob on A8 changes the speed.
Open in the lab →
UNOThe screen says "Wait…" and then "PRESS!". Press any shield button as fast as you can. The screen shows your time in milliseconds. Press too early and it is a false start!
shieldLCD 1602Open in the lab →
UNOTurn the encoder to pick a digit, then press the knob to go to the next one. Enter 3-7-1 and the relay clicks and "opens the door" (the lamp turns on).
shieldLCD 1602Open in the lab →
UNOA soil sensor and a light sensor take care of a plant. When the soil is dry, the relay turns on the "pump" (the lamp on the relay), and the screen shows how the greenhouse is doing.
shieldLCD 1602Open in the lab →
UNOThe closer your hand gets to the distance sensor, the more lights turn on: green means far, yellow means closer, red means very close. Move the "Distance" slider.
WS2812HC-SR04Open in the lab →
UNOA short press of the button is a dot, a long press is a dash. Arduino beeps, blinks and turns your signal into a letter in the Serial Monitor all by itself. Try "...": that is S!
Open in the lab →// PARTS
Put any of them on the bench, wire it up and program it. And if your part is missing — add it from a photo.
// PARENTS_AND_TEACHERS
The lab is made for kids: plain language, hints at every step and no unnecessary information about the child.
An account needs only a username and a password — no email, phone or last name. Passwords are stored hashed. Parts that kids share with everyone appear only after an adult reviews them.
Plain-language hints, step-by-step builds and an automatic circuit check. The helper explains every wire and every line of code and stays on topic.
Every child has their own account and projects. Projects can be shared by link, and questions and bug reports go to an adult, who answers right inside the lab.
Without signing up you can build and run circuits. With an account you get cloud projects, up to 80 helper answers a day and parts from photos.
// FAQ
Yes. The lab runs a real emulator of the Arduino processors: the ATmega328P (UNO, Nano) and the ATmega2560 (Mega). Write a program, press “Run” and it executes just like on a board: LEDs blink, the ultrasonic sensor measures distance, the display shows text. You don’t need a board — but if you have one, you can upload the program to it too.
The lab is free for now. Without signing up you can build circuits and run programs — projects are saved in your browser. With an account, projects are stored in the cloud, the AI helper answers up to 80 times a day and you can add parts from photos.
No. Everything runs in the browser: the code editor, compilation, simulation and uploading to a real board (in Chrome or Edge on a computer). On Windows, clone boards with the CH340 chip sometimes need the CH340 driver.
It works best for kids aged 9–16. Hints are written in plain language and the helper explains every wire and every line of code. Younger kids are better off starting together with a parent.
Arduino UNO, Nano and Mega 2560 (you can run several boards at once), the Sensor Shield, LCD Keypad Shield and Multi-function Shield, 433 MHz radio modules and 33 fully simulated parts: LEDs, buttons, the HC-SR04 ultrasonic sensor, WS2812 LED strip, light, sound, flame, gas and soil moisture sensors, a relay, a rotary encoder, a servo and more. The catalog has 1600+ more modules with pinouts, and you can add your own part from a photo.
Yes. There is a “How to build” switch: “direct” runs the power wires from each module straight to the Arduino’s 5V and GND; “breadboard” lets the Arduino power the long + and − rails, and the modules take power from there, like on a real bench. Every ready-made project and every project from the AI helper can be built either way, step by step too.
Open the “🔌 Board” tab, plug the Arduino in with a USB cable and press “Connect” — the browser shows a list of ports. Then press “Upload to a real Arduino”: the program is compiled on the server and sent to the board over the STK500 protocol, just like from the Arduino IDE. UNO, Nano (including clones with the old bootloader) and Mega 2560 are supported.
The processor is emulated instruction by instruction, with timers, PWM, ADC, interrupts and the serial port, so real libraries such as Servo, LiquidCrystal and Adafruit NeoPixel work. Sensors are modelled by how their outputs behave: set the light, distance or moisture with a slider and the Arduino sees the matching signal.
The lab is made for kids and works in English and Russian. It has an AI helper that designs projects from the parts a child actually owns, guides the build step by step and suggests what to buy. You can add your own part from a photo, run two boards that talk over radio and upload a program to a board without installing anything.
An account needs only a username and a password — no email, phone or last name; passwords are stored hashed. The AI helper only talks about electronics and programming. Parts that kids share with everyone appear only after an adult reviews them.
When signing up, the lab shows a recovery code — write it down. With the username and this code you can set a new password yourself (the “Forgot your password?” link). If the code is lost, an adult administrator can reset the password.
Yes. The lab is built for a class sharing one school internet connection: every child has their own account and projects, finished projects can be shared by link, and bug reports and ideas go to an adult, who answers right inside the lab.
// GET_STARTED
Open the lab, pick the “Blink” project — and in a couple of minutes your first LED will be blinking.
You can also skip signing up — projects will be saved in this browser.