By now you hopefully have your Circuit Playground Express (CPX), Circuit Playground Bluefruit (CPB) or an Arduino and itβs time to get your microcontroller up and running. A very in depth and detailed tutorial can be found on the Adafruit Learn site[32] for the CPX and similar tutorials exists for the Arduino. This chapter is a summary of what you need to do to get the CPX or Arduino up and running as well as writing a simple blink code.