Arduino in Sim Lab

Add an Arduino Uno to a circuit, write code for it, and watch it run in the simulator.

Sim Lab can run a real Arduino Uno inside your circuit. You write a program, Maestro builds it, and the simulator runs it on an emulated chip that is connected to the LEDs, buttons, displays and sensors you wire up.

The big picture

Add the board. Open Parts, then Arduino and board parts, and add the Arduino Uno. Wire your parts to its pins.

Write code. Open the Code panel next to the circuit and write a sketch (or AVR C).

Upload. Press Upload. Maestro compiles your code on its servers and loads the result onto the board.

Run. The circuit and the program run together, in real time. delay(500) takes half a real second.

What is emulated


Board	Arduino Uno only (ATmega328P at 16 MHz)
Memory	32 KB program (flash), 2 KB RAM, 1 KB EEPROM (blank at every start)
Hardware	Digital pins, analogue inputs, PWM timers, serial (UART), I2C (TWI)

Other boards such as the Nano, Mega, ESP32 or Pico are not available.

Where to go next

Writing code

Sketches, AVR C, files and libraries.

Build and run

Compiling, errors, serial monitor and speed.

Pins and functions

What digital, analogue, PWM and interrupts do.

Parts

LEDs, buttons, LCDs, servo, keypad, sensors and more.

In tests and assignments

How Arduino questions are marked.

Limits

What is not supported.