CircuitPython is a derivative of MicroPython designed to simplify experimentation and education on low-cost microcontrollers. It makes it easier than ever to get prototyping by requiring no upfront desktop software downloads. Simply copy and edit files on the CIRCUITPY drive (which appears as a USB flash drive when you plug the board into your computer via a USB cable) to iterate.
The following instructions will show you how to install CircuitPython. If you've already installed CircuitPython but are looking to update it or reinstall it, the same steps work for that as well!
Follow this quick step-by-step for super-fast Python power :)
Click the link above and download the latest UF2 file.
Download and save it to your desktop (or wherever is handy).
Plug your Feather M4 into your computer using a known-good USB cable.
A lot of people end up using charge-only USB cables and it is very frustrating! So make sure you have a USB cable you know is good for data sync.
Double-click the Reset button next to the USB connector on your board, and you will see the NeoPixel RGB LED turn green. If it turns red, check the USB cable, try another USB port, etc. Note: The little red LED next to the USB connector will pulse red. That's ok!
If double-clicking doesn't work the first time, try again. Sometimes it can take a few tries to get the rhythm right!
You will see a new disk drive appear called FEATHERBOOT.
Drag the adafruit_circuitpython_etc.uf2 file to FEATHERBOOT.
The LED will flash. Then, the FEATHERBOOT drive will disappear and a new disk drive called CIRCUITPY will appear.
That's it, you're done! :)
For more detailed info on installing CircuitPython, check out Installing CircuitPython.