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 to iterate.
Follow this quick step-by-step for super-fast Python power :)
For more detailed info on installing CircuitPython, check out Installing CircuitPython.
Click the link above and download the latest UF2 file.
Download and save it to your desktop (or wherever is handy).
Plug your Itsy nRF52840 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.
In the image, the Reset button is indicated by the magenta arrow, and the BTLE status LED is indicated by the green arrow.
Double-click the Reset button on your board (magenta arrow), and you will see the BTLE LED (green arrow) will pulse quickly then slowly blue. If the DotStar LED turns red, check the USB cable, try another USB port, etc.
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 ITSY840BOOT.
Drag the adafruit_circuitpython_etc.uf2 file to ITSY840BOOT.