Mu is a simple Python code editor for beginner programmers. It looks like this:

Mu Editor

Installing Mu on Windows or Mac

The first step is to download the latest version of Mu from

If you are using Windows, you must be running Windows 7 or higher. For macOS you must be running 10.12 (Sierra) or higher.

Using Mu

Mu attempts to automatically detect a Circuit Playground Express plugged into a computer. Before starting Mu, please plug in your CircuitPlayground Express and make sure it shows up as a CIRCUITPY drive in your computer’s file explorer.

Once Mu is started, you will be prompted to select your mode. Please select Adafruit CircuitPython.

Ok, let’s get started!