How it works...

When the device is turned on it looks for certain files, such as code.py or main.py, that, if found, will be executed as part of the startup process. In this way, you can specify the code you want run when the device is powered on. The script first imports the adafruit_circuitplayground.express library so that it can control the NeoPixels. The first NeoPixel is set to the color red by giving it a set of appropriate RGB values.

Finally, the script will sleep for 60 seconds so that the LED remains lit for one minute before the script ends execution.