Source: https://mokxi.com/docs/start/first-project
Updated: 2026-09-27

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Docs / Getting started / Your first project in five minutes

# Your first project in five minutes

An Arduino Uno, one LED, one resistor and eight lines of code, built from an empty canvas.

## Clear the bench

Open the editor. The first time, it opens on this very circuit, already
built: an Uno blinking an LED, called First blink. Press Run to see it, then
start from scratch: select everything with Ctrl/Cmd+A and press Delete,
or open Save, then Built-in projects, and pick something to start from instead. Nothing here is lost: the
browser keeps the last state of every project you open.

## Put a breadboard and a board down

Press + on the canvas toolbar, or the A key. The part panel opens docked
on the left, with a search box and a category rail. Type breadboard, then drag
the tile onto the canvas, or click it to drop it at the middle of the view.

Do the same for Arduino Uno. The Uno does not push into a breadboard: its
headers are two inches apart, which is wider than the board is, so it sits
beside the breadboard and is wired to it with jumpers, exactly like the real
thing.

## The LED and its resistor

Add an LED and a resistor, and drop both onto the breadboard so their
pins land in holes. A breadboard strip is five holes long, so two pins in the
same strip are the same net. Put the LED's cathode and one end of the resistor
in the same strip.

Select the resistor. The properties panel opens beside it with its value in
ohms; 220 is the usual choice for an LED on 5 V. Select the LED and you can pick
its color.

## Wire it

Drag from the Uno's 13 pin to the strip the LED's anode is in, and from the
free end of the resistor to a GND pin. While you drag, the hole or pin under
the pointer gets a ring and its name, so you can see what you are about to land
on. Let go and the wire is drawn with square corners you can drag afterwards.

Nothing needs a power rail here: the Uno drives the LED from its own pin.

## Write the sketch

The right-hand pane is now the Uno's project. Replace what is in sketch.ino
with this:

## Run it

Press Run. The first build downloads clang once and caches it, so it takes a
few seconds; every build after that is a fraction of a second. The Build tab
shows the steps, and a diagnostic there is clickable and takes you to the line.

The LED blinks once a second and the header readout settles near 1.00x, which
means the simulated circuit is keeping pace with real time.

## Keep it

Press Save. Signed out, that writes to this browser. Signed in, it also
writes to your account, and Share gives you a link to send someone. See
saving and autosave and
sharing a project.

Next: placing parts, wiring,
or the whole Arduino Uno model.

### On this page

Clear the bench Put a breadboard and a board down The LED and its resistor Wire it Write the sketch Run it Keep it