STEM activities at home, with nothing to buy
Light an LED, build a reaction game, make a night light that knows when it is dark. Every activity below is a real circuit that runs in your browser, so a curious kid can start in a minute and nothing breaks if they get it wrong.
- A good fit for ages 10 and up, younger with a grown-up
- About 15 to 45 minutes an activity
- Nothing to buy or install
Projects to open
Each one runs in your browser in one click, with no account. Ages and times are suggestions.
Hello, breadboard
A switch, a resistor and an LED. The very first circuit, with nothing to code.
- Ages 8 and up, with help
- About 15 minutes
First blink
The first program: an LED that blinks, and a number that changes how fast.
- Ages 10 and up
- About 20 minutes
Piezo melody
A tune on a tiny speaker. Change the notes and it plays your song.
- Ages 10 and up
- About 25 minutes
Night light
A light that turns on in the dark, the way a real night light does.
- Ages 10 and up
- About 25 minutes
Reaction timer
A game that measures how fast you are, in milliseconds. Great for a family contest.
- Ages 11 and up
- About 30 minutes
Why a simulator first
Electronics kits are wonderful, but they cost money, parts go missing, and a first mistake can burn out an LED. Here a reversed LED or a short circuit costs nothing: the child sees it fail, works out why, and fixes it.
When an activity clicks, the same circuit can be built for real later. The wiring is on a real breadboard layout and the code is ordinary Arduino C++, so what they learn carries straight over.
How to run an afternoon
A rhythm that works for most families:
- Open one project together and press Run. Watch what it does before anyone reads the code.
- Ask one question: what happens if we change this number? Then change it and press Run again.
- Let them break something on purpose, like taking out a wire, and find it again.
- Finish by naming what they built in their own words. That is the part that sticks.
What you need
Nothing but a browser. Mokxi is a web page. The circuit and the code run inside the browser tab, the C++ compiles there too, and nothing is downloaded or installed, so it works on a school Chromebook, a family laptop or a tablet.
Kids’ privacy, plainly
What happens to a child’s information, written from what the code does.
- Every project here opens and runs with no account, so a child never has to give a name or an email to use it.
- Saving work needs an account. A child under 13 can have one only with consent: a parent writes to us from their own email address and we confirm it, or a school gives consent for its classes.
- For a student in a class, no analytics or advertising tag loads on any page, and classmates never see each other’s email addresses.
The details, for parents and schools: Student data privacy, COPPA and FERPA
Questions
Do I need to know electronics to help my child?
No. Each project runs as soon as you press Run, and its page explains what every part does. Learning alongside your child works well, and nothing you try can damage anything.
Is it really free?
Yes. Every board and every part is on the free plan, with no time limit and no card. An account is only needed to save work.
Does my child need an account?
Not to open and run projects. To save work, a child under 13 needs a parent’s consent first: you write to us from your own email address and we confirm it with you.
Will it work on our computer?
If it runs a modern browser, yes. That includes Chromebooks, Windows and Mac laptops, and most tablets. There is nothing to install.
Give it a try
Open a project, press Run, and change one thing. No account needed to start.
Free forever. Every board and part. Saves your projects. Works on Chromebooks.