⚡ No installation needed · Just a USB cable

A microcontroller?
It's just a wardrobe
with switches.

Every drawer does one thing. Put 1 in the right compartment — something happens in the real world.

🗄️ ATmega328P — I/O REGISTERS Arduino Nano · UNO
Zoom into drawer 5 — the one that lights up the LED
Register 5 0x05 · PORTB

8 compartments. Each one is a physical pin on the chip.
Put 1 in compartment 5 → voltage on pin 13 → LED on.

Drawer 5 — 8 compartments (bit 7 → 0) Click!
Click compartment 5 ☝️ Onboard LED · Pin 13 · Arduino Nano/UNO
// compartment 5 = 0 → PIN low → LED off
See how to use it for real
The code

Two lines.
LED on.

No libraries. No magic. You speak directly to the chip.

ledon.asm
1sbi 4,5  ← compartment 5 of drawer 4 = OUTPUT direction
2sbi 5,5  ← compartment 5 of drawer 5 = 1 → LED 🔴
✓ costycnc.it/avr1

Your path today

  • Open the browser
  • Plug in the USB cable
  • Type sbi 5,5
  • Click Assemble → Connect
  • LED on. You know why.
✗ Classic method

The traditional path

  • Install Arduino IDE (500 MB)
  • Configure drivers, board, port
  • Learn setup(), loop(), pinMode()
  • LED on… but you don't know why
  • Only online simulator available
Tutorial

Three steps and you're in

1

Plug Arduino into your PC

A USB cable. Any computer. Chrome or Edge. Nothing else.

2

Open the site and type the code

Go to costycnc.it/avr1 — the editor is already there, ready.

sbi 4,5    sbi 5,5
3

Assemble → Connect → watch the LED

The site converts your instructions and uploads them via USB in seconds. The LED lights up. You just programmed a microcontroller.

Why ATmega328?

Not just a chip.
The best one to truly understand.

There are thousands of microcontrollers. This is the right one to start with — really.

📖

Best documented chip in the world

Millions of examples, huge community. You'll never be stuck alone.

🏛️

DNA of every modern chip

UART, I2C, SPI, ADC, Timers — the exact same modules found in every MCU made today.

🔍

Transparent like no other

Every drawer is visible and editable. Modern chips hide everything behind layers.

💰

Costs 2–3 euros

Arduino Nano clone under €3. Break it — buy another without crying.

🏠

Real home automation from day one

LEDs, relays, motors, sensors. On day one. No theory required first.

⚡

Zero installation

Browser + USB = ready. Mechanics, carpenters, kids — everyone.

FAQ

Quick answers

Yes. You don't need to know what variables or functions are. You need to know that sbi 5,5 puts 1 in the right compartment and the LED turns on. Everything else comes naturally.
No. They're just the names of the drawers. Drawer 4 = direction. Drawer 5 = value. You'll learn the names naturally as you use the system — not before.
Absolutely not. Chrome or Edge, a USB cable, and you're ready. Zero drivers, zero IDE, zero configuration.
Yes — and you'll understand it much better. When IDE calls digitalWrite(13, HIGH), you already know what it's doing: putting 1 in compartment 5 of drawer 5.
Yes. UNO, Nano, Pro Mini, LGT8F328P — all based on the same ATmega328. Just choose the right board in the site when you upload.

Your first LED
is waiting.

No installations. No theory. One USB cable and you're in.

⚡ Start at costycnc.it/avr1