Datasheet
CircuitPython
CircuitPython (https://adafru.it/tB7) is a derivative of MicroPython (https://adafru.it/BeZ) 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.
Set up CircuitPython Quick Start!
Follow this quick step-by-step for super-fast Python power :)
https://adafru.it/Ie7
https://adafru.it/Ie7
Further Information
For more detailed info on installing CircuitPython, check out Installing CircuitPython (https://adafru.it/Amd).
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!
© Adafruit Industries https://learn.adafruit.com/adafruit-itsybitsy-nrf52840-express Page 40 of 179










