How can the HAT be programmed? Does it come with a Python module, and is it user friendly? Can it be programmed in another language? Is there documentation to support your learning?.If you are using a Raspberry Pi 400 then you will need a breakout board to access the GPIO. Does the HAT work with your Raspberry Pi? Every Raspberry Pi since 2014’s Raspberry Pi B+ features a 40 pin GPIO, and all HAT boards are designed for that.What is the HAT for? If it’s for a particular project, does it do what you need it for? If it is for a child, does the HAT have enough features to grow with their learning?.When buying a Raspberry Pi HAT, ask yourself these questions: These expansion boards can be used for everything from general learning to building arcade cabinets or implementing A.I. To help you choose, we’ve listed the best Raspberry Pi HATs below, based on use case. If you intend to use a HAT with the new Raspberry Pi 400 then you will also need a breakout connector, such as Pimoroni’s Flat HAT Hacker HAT. There are hundreds, if not thousands of Raspberry Pi HATs on the market and most of them will work with any model of Pi that has 40 pins, which is every model launched from 2014, though you’ll need to attach the GPIO pins to the Pi Zero. HATs are expansion boards that connect to the Raspberry Pi’s set of 40 GPIO pins and add functionality such as lights, motors, sensors and fans. But to make the most of the Pi, it helps to have the right HAT (hardware attached on top). We can learn to code, build robots, monitor satellites in orbit and so much more. The Raspberry Pi is an awesome platform for learning and experimentation.