The idea of Rainbow HAT [https://shop.pimoroni.com/products/rainbow-hat-for-android-things] (a HAT - Hardware Attached on Top - is an add-on board for your Raspberry Pi) is to showcase the full range of what’s possible on a HAT, in terms of inputs and sensors, and outputs, as well as the interfaces used to communicate with them and, of course, our signature colourful LED lights. We’ve crammed as much as was physically possible onto it - two different types of LEDs, a 4-digit alphanumeric displa