Zumo mini robot for Arduino
The small mobile robot Zumo from Pololu is designed to achieve sumo tournaments through its faceplate. It's programmable as it embeds an Arduino board.
There are 8 products.
This Optical Encoder Pair Kit for Micro Metal Gearmotors is designed for fitting to the rear of Polulu micro metal gearmotors with extended back shafts. You also get two pairs of toothed wheels in different dimensions, so you can choose your resolution.