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Build real Arduino robots in your browser.
Wire the circuit, write the code, and watch it run on a simulated Arduino Uno. A robotics lab for ages 10 to 16, with no kit to buy and nothing to install.
The first levels are free. No card, no download, no kit.
- A course, level by levelFrom one blinking LED to robots that steer, sense and decide.
- Real Arduino C++Compiled by the real Arduino toolchain. The same sketch runs on a physical Uno.
- No kit neededRuns in your browser on a phone, tablet or computer - nothing to install.
- Checked by the simulatorA level passes when the circuit does the job, not when a box is ticked.
How a level works
Every level is a small project with a goal. You build it the way an engineer would: wire, code, test, fix.
Wire it
Place real components, such as LEDs, sensors, motors and displays, and connect them pin to pin. A short guide shows where each wire goes.
Code it
Write Arduino C++ in a proper code editor, with the same functions you would use on a real board.
Run it and get checked
Press run. Your code is compiled and runs on a simulated chip. If the circuit does not work, the simulator says why, in plain words.
Compiled
D13 toggled 6 times in 6.0 s
LED never lit: no current path
The ULN2003 board has no power on VCC (+). Wire it to 5V.
Try level 1 right now
Two wires and an LED, open to anyone, no account needed.
Build the first circuit now. No account.
This opens the real editor on the real Level 1 — the same one students use. A short guide walks you through the two wires, then you press run and watch your own code blink an LED on a simulated chip.
Watch a robot drive itself
Two infrared sensors, two motors and a motor driver. The sketch that goes with it is compiled and run on a simulated chip, and it is what steers. Nothing here is a recording.
left eye offright eye off0 mm off centre
Nothing here is animated. The sketch is steering — the eyes read the line, the code sets each wheel's speed, and the robot goes where that takes it.
const int IN1 = 2, IN2 = 3, IN3 = 4, IN4 = 5, ENA = 9, ENB = 10;const int EYE_L = 7, EYE_R = 8;const int FAST = 200, SLOW = 70; // Which eye saw the line last. A robot that has lost the line entirely knows nothing about// where it went EXCEPT this, and it is enough: the line left on the side that saw it last.int lastSeen = 0; void wheels(int left, int right) { digitalWrite(IN1, left > 0 ? HIGH : LOW); digitalWrite(IN2, LOW); digitalWrite(IN3, right > 0 ? HIGH : LOW); digitalWrite(IN4, LOW); analogWrite(ENA, left); analogWrite(ENB, right);} void setup() { int outs[] = {IN1, IN2, IN3, IN4, ENA, ENB}; for (int i = 0; i < 6; i++) pinMode(outs[i], OUTPUT); pinMode(EYE_L, INPUT); pinMode(EYE_R, INPUT);} void loop() { bool leftOnLine = digitalRead(EYE_L) == LOW; bool rightOnLine = digitalRead(EYE_R) == LOW; if (leftOnLine && !rightOnLine) { lastSeen = -1; wheels(SLOW, FAST); } else if (rightOnLine && !leftOnLine) { lastSeen = 1; wheels(FAST, SLOW); } else if (leftOnLine && rightOnLine) { wheels(FAST, FAST); } else { // Both eyes off the line. Driving straight on here is what loses a robot for good on a // sharp corner: it carries on into open floor and never sees the line again. Turn back // towards whichever eye saw it last and it sweeps until the line comes round again. if (lastSeen < 0) wheels(0, FAST); else if (lastSeen > 0) wheels(FAST, 0); else wheels(FAST, FAST); } delay(5);}Forty lines, compiled by the real Arduino toolchain. A student writes this by level 10.
From one blinking LED to a robot that finds its own way
Levels in modules that build on each other. Each picture is the finished project of a real level.
Boards and pricing
Start free. When you want the rest of the Arduino Uno course, choose one year or lifetime access. Every level today runs on a simulated Arduino Uno.
- Start here
Free levels
₹0no card neededThe first levels are free for everyone, with the same editor, simulator and checks as the rest of the course.
Try the first levels free - Arduino Uno course
Arduino Uno Course — 1 Year
₹999per yearOne year with the Arduino levels and components available when you buy. Newly released levels and components are not included; choose Lifetime for future Arduino course updates.
Get one year - Arduino Uno course
Arduino Uno Course — Lifetime Access
₹2,999one payment, lifetime accessComplete Arduino Uno course access for life. Build and simulate every current Arduino project, plus future Arduino levels and components as they are released.
Get full access - Schools and colleges
Student seats
₹499per student, per yearStart with 10 or more student seats. Add any number later. Pay through Razorpay for up to 50 seats, or request an invoice for a bank transfer. Teachers never use a seat.
Buy seats for a school
Prices in Indian rupees. Payments by card, UPI, net banking and wallets through Razorpay. Compare all plans
For parents
Robotics without a box of parts on the dining table, and with a record of what your child has actually built.
Safe to use
No adverts, for anyone. If your child is under 18, we ask a parent or guardian for consent by email before the account can be used. Analytics never run inside lessons. And there is no soldering iron, mains power or small parts at home.
Progress you can see
Every level is checked by the simulator, so “done” means the circuit really worked. Their dashboard shows how far through the course they are and what comes next.
A certificate anyone can check
Finishing the course earns a ThinkFusion certificate with a QR code. A school, a teacher or you can scan it to confirm it is genuine.
Read how we handle a child’s data in the privacy policy.
For schools and colleges
A robotics lab for the whole class, with no kits to buy.
Every student gets their own bench in the browser. You get seats, a roster and an invoice. The first levels are free, so a class can start before any paperwork.
Classroom and lab licences
One seat is one student for one year. Buy seats for the classes that use it; when a student leaves, the seat can go to the next one.
Teacher dashboard
A live roster shows who has joined, how far each student has got, and who has gone quiet. Teachers never use a seat.
Bulk seats with a join code
Read out a code; each student signs in with Google or GitHub and claims a seat. No roster to import, no passwords to reset.
Curriculum mapping
Every module states its learning goals and the components it uses, so levels line up with your syllabus or tinkering-lab plan. Send us yours and we will map it with you.
No hardware for every student
Thirty students, thirty circuits, all running at once, on the computers your lab already has. Nothing to share, store or repair. Labs need a current browser and internet.
Try it with a class first
The free levels need no seat and no purchase order. Put a class through them, then decide.
See it working in your lab
Book a demo and we will walk a teacher through a level, the roster and how seats work. A person replies within 2 working days.
Or write to info@abilityfusion.com. The full details for schools are on the schools page.
Questions people ask
- Do I need an Arduino kit or any hardware?
- No. You wire the circuit on screen with realistic components, write real Arduino C++, and it runs on a simulated Arduino Uno in the browser. Nothing to buy, break or replace.
- Is it real Arduino code?
- Yes. Your sketch is compiled by the real Arduino toolchain and runs on a simulated AVR chip, cycle by cycle — the same code works on a physical Arduino Uno.
- What will I build?
- Build projects from blinking an LED to buttons, buzzers, ultrasonic and PIR sensors, motors, a line-follower robot, obstacle avoidance, servos, Bluetooth control, LCD and 7-segment displays, a keypad, temperature sensing, a thermostat and a maze-solving robot.
- Is it free?
- Levels 1 to 4 are free, with no card. ₹999 gives one year with the Arduino levels and components available when you buy; future additions are not included. ₹2,999 gives lifetime access to current and future Arduino course levels and components.
- How does it work for schools?
- A school buys seats at ₹499 per student per year, starting with at least 10 seats on its first purchase. Later it can add any number. Students join by code; teachers see progress and do not use a seat. Pay through Razorpay for up to 50 seats or request an invoice for a bank transfer.
- Do I need to install anything?
- No. It runs in your browser on a phone, tablet or computer. There is nothing to install.
Your first robot is a browser tab away.
Try the first levels free