This kit gives you everything you need to add a second level to your 3pi robot. The black printed circuit board matches the color of the 3pi and has cutouts that let you view the LCD below and make it easier to reach the power button, reset button, and programming header.
The expansion PCB matches diameter of the 3pi chassis and mounts just above the tops of the wheels using the four included screws and spacers. Once assembled, the PCB has electrical connections to the base that allow you interface your own electronics with the 3pi robot, which is sold separately.
This set includes a pair of 42×19mm wheels, a pair of extended brackets, and two matching encoders. This set is intended for those looking to create a differential-drive robot with dual quadrature encoders. Just add two micrometal gearmotors of your choosing (sold separately). We will add a few models in the next two weeks.