Troika Construction Slim + Slimpad - Pen & Notepad Combo Colour:Titanium The input connectors have a

The input connectors have a low voltage port that can read signals between 3V and 24V

Product number: Seeed 101020002

which can snap onto the Pi PCB (and is removable later if you wish) and gives you all sorts of prototyping goodness to make building on top of the Pi super easy

METRO has 20 GPIO pins

The HAT supports GNSS positioning via the GPS

Troika Construction Slim + Slimpad - Pen & Notepad Combo Colour:Titanium The input connectors have aThis quality Troika Pen + Notepad combo includes the excellent Troika Construction Slim pen alongside a perfectly matched A6 Troika Slimpad notepad both sporting lots of clever little features! Delivered in a presentation box, it's perfect as a gift for the writer or maker in your life. The combo is available in a number of different colours to suit their individual style (select above). We also sell the smaller A7 Lilipad combo which comes with a