For many of our development boards, sensors, and feathers featuring convenient stemma QT ports, construction of multiple-board projects is incredibly streamlined. An advantage of this design is the lack of need for a breadboard; our swirly grid design is an alternative solution for easy mounting of various small-sized microcontroller and sensor boards.

The grid is made out of an 'aluminum PCB' - we have that in quotes because while technically it is made with a PCB process for single-sided aluminum-core PCBs, there's no actual copper on here, its just the aluminum backing, and then black soldermask with silkscreen. The aluminum is conductive both electrically and thermally - so watch out if you are using metal screws to attach stuff. Unless, that is, you want to turn the whole thing into a ground plane in which case: go for it.

Each square is 0.6" x 0.6" and there's holes or slots every 0.2 inches. With the various dots and dashes you can pretty much make anything on a 0.1" grid fit. Each drill hole is 0.1" / 2.54mm diameter, the slots are 0.11" x 0.3" (2.75 x 7.5mm)  And if that's not good enough, the aluminum is easy to cut/drill/machine/bend if you need more customization.

This one is 10x10 'blocks', so 6" x 6" in size or about 150x150mm