Adafruit Feather M4 Express User Manual

It will look like this - note that under the while True:
line, the next four lines have spaces to indent them, but
they're indented exactly the same amount. All other
lines have no spaces before the text.
Save this file as code.py on your CIRCUITPY drive.
On each board you'll find a tiny red LED. It should now be blinking. Once per second
© Adafruit Industries https://learn.adafruit.com/adafruit-feather-m4-express-atsamd51 Page 48 of 183

Adafruit Feather M4 Express Specifications

General

Brand	Adafruit
Model	Feather M4 Express
Category	Microcontrollers
Language	English