PiStack is an I/O expansion kit designed for Raspberry Pi, which provides 3 sets of 2x20 pin headers, which means a handy way of "stacking" multi different HATs together and using them as a specific combination/project. The kit comes with standard Raspberry Pi connectivity, directly pluggable OR through the ribbon cable. It also comes with 3 sets of 2x20 pin headers, which means a handy way to "stack" multi different HATs together, and use them as a specific combination/project. The clear and descriptive pin labels for easy use make using the kit a breeze. The reserved jumper pads on the bottom side, pin connections are changeable by soldering, to avoid pin conflicts. Features Standard Raspberry Pi connectivity, directly pluggable OR through the ribbon cable. 3 sets of 2x20 pin headers, connect multi HATs together. USB external power port provides enough power supply for multi HATs. Clear and descriptive pin labels for easy use. Reserved jumper pads on the bottom side, pin connections are changeable by soldering, to avoid pin conflicts. Resources PiStack GitHub.