Puck.js: JavaScript + Bluetooth = ♥

A JavaScript microcontroller you can program and debug wirelessly.
No software needed - get started in seconds with Web Bluetooth!

Buy Now! More information »

JavaScript on Board

With Maps, Dynamic Arrays and Objects out of the box.
Just plug in and start creating in seconds.

Buy Now, just $24.95 / £20.00

Choose your board

4 different devices offering a range of functionality!
WiFi, Bluetooth, and even Micro SD cards.

Original Pico WiFi Puck.js

Get Started Quickly

A large selection of tutorials, all searchable and indexed by the hardware they use ensures that you're up and running in no time!

Quick Start View Tutorials

Easy to Connect

With a growing list of libraries and documentation for many common devices, use Espruino to quickly prototype your next product

View Modules

Tiny and easy to integrate

The Pico's small size and castellated edges make it easy to embed in your product, drastically reducing development time and cost.

Espruino Pico

Embedded computing that's about as easy as it gets.
by John O'Connor

Got my kickstarted @Espruino pico yesterday and took 1 minute to get working! and runs javascript, amazing espruino.com
by ben byford

After a weekend of playing, have to say I’m extremely impressed with the @Espruino pico! Definitely need to get my hands on a few more…
by Matt Bennett-Lovesey

The TTB "Time To Blink" of the @Espruino board is phenomenal. Love the Chrome Web IDE.
Phil Howard

The @Espruino Pico is a great debugging tool. Here to test a few transistors. Seems like half of my bag was broken...
by Boris Adryan

@Espruino Pico! Had SPI running in 5 minutes and as many lines of code #awesome
by James Waples

In just 2 min I have my first @Espruino program running :)
by Adam Butler

After years of Arduino in various flavours, tried the Espruino today. Wow, realise what I was missing. espruino.com @Espruino
by Ian Watkins

Afternoon playing with @Espruino fantastic piece of kit and so easy to program
by Matthew Reid

Building a temperature data logger with @Espruino firmware on an STM32 dev board with 2.4" screen. Love doing hardware with Javascript :)
by Steve Anderson

@Espruino + @NodeRED = #javascript joy! Real time event driven GPIO via USB no OS/Driver worries! ...
by Lawrence Griffiths

@Espruino Hey! Just got the board from seed. Up and running in 20seconds including IDE install. Thanks!!! #js #DIY
by Stands Opichal

Loving the @Espruino.. So much control instead of hacky work arounds that I've been doing with my Arduino loop
by Hardware_Hacks

Got my @Espruino running nicely in 15 mins on Win 8.1. This is the perfect hardware to introduce students to ICT in schools.
by Ward De Backer

JavaScript

"The Language of the Web" is used everywhere - your laptop, phone, TV, and the servers that power the internet. With Espruino you can use it on a low power microcontroller too!

Responsive

Espruino is an interpreter. It gives you instant feedback so you can view and modify your program while it is running

Get Started! »

Fully Open Source

Hardware (CC-BY-SA), software (MPLv2), and documentation. Add functionality, tweak it, or just browse and see how it works.

Donate » Fork us on GitHub »

Crowdfunded

Both Espruino Boards were crowdfunded using KickStarter. See the campaigns:

Pico Original

Everything on one chip for the lowest power consumption.

Unlike other boards that run JavaScript, Espruino fits everything it needs into single chip. This makes it affordable, reliable, and power efficient - allowing it to run for years on a battery.

No software needed. Get started in seconds

Espruino plugs in to your computer by USB and appears as a serial device. No drivers, and no special software. Just run a terminal application and start writing code right away!

See our 'Quick Start' tutorial

Espruino Web IDE makes coding even easier

It installs in seconds and provides a modern Syntax Highlighted editor with code completion. It even automatically loads any modules you need from the internet.

Find it on the Chrome Web Store