Use WebUSB to allow Microsoft MakeCode to download direct to Circuit Playground Express

If you’ve been using Microsoft MakeCode for your Circuit Playground Express projects, you know how easy and powerful it is to program. But it is a two-step process to save a UF2 code file to hard disk then copy that file to the Circuit Playground Express boot USB drive CPLAYBOOT. If you make small changes, those save & copy cycles add up.

Why not have download automatically load the code to the Circuit Playground Express?

Now you can! But it requires a technology called WebUSB.

You’ll need to do a few things before you can use WebUSB

  • You will need to use the latest version of the Google Chrome web browser. Firefox, Safari, Opera, Edge, etc do not support WebUSB at this time. Only Chrome, only versions 68 or greater!
  • Run Windows 10, Latest Mac OS X or Linux.   Windows 7 or 8 are not supported!

If you have the latest Google Chrome version, you can follow this new page in the Adafruit MakeCode for Circuit Playground Express guide to enable one-click downloads.

It’s a one time procedure, then you can enjoy clicking the pink Download button and have your code go direct to your board and automagically run.

Note: This is Beta Software from Microsoft and you will have to access the editor using the URL – if it somehow breaks, it could be Chrome or Microsoft fiddling around (and not Adafruit), you have been warned.

Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here:

Join Adafruit on Mastodon

Adafruit is on Mastodon, join in!

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Join over 36,000+ makers on Adafruit’s Discord channels and be part of the community!

CircuitPython – The easiest way to program microcontrollers –

Maker Business — “Packaging” chips in the US

Wearables — Enclosures help fight body humidity in costumes

Electronics — Transformers: More than meets the eye!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Silicon Labs introduces CircuitPython support, and more! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Guardian Robot, Weather-wise Umbrella Stand, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — #NewProds 7/19/23 Feat. Adafruit Matrix Portal S3 CircuitPython Powered Internet Display!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.