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. The trinket M0 is the second board that comes pre-loaded with CircuitPython. Simply copy and edit files on the CIRCUITPY drive to iterate.
If you have already plugged in your board, start by ejecting or "safely remove" the CIRCUITPY drive. This is a good practice to get into. Always eject before unplugging or resetting your board!
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 PyRuler 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 small Reset button next to the Trinket M0 name printed on your board, and you will see the Dotstar RGB LED, noted by the green arrow in the image, turn green. If it turns red, check the USB cable, try another USB port, etc. Note: The little LED above the USB connector will be red - this is 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 TRINKETBOOT.
Drag the adafruit_circuitpython_etc.uf2 file to TRINKETBOOT
The red LED will flash. Then, the TRINKETBOOT 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.