If you need a mini controller for your robot, This product will be your type. We have developed a product called Grove – Mini Track ball. As you can see, on this product, there is a mini track ball here, you can feel free to rotate the ball horizontally and vertically from any angle. There are 5 axes here, up down left right and press down. As you move the ball, you will get the the values from these 5 axes and the values will be changed according to the direction and speed you move the ball. ![enter image description here][1] With the STM32F103C8T6 and AN48841B chip inside, you can turn plenty of your ideas into real things. It is also standardized with Grove interface which will save you a lot of work in the process of prototyping. Have fun ! Features 360° and Quick Detection. Translucent Click Button. Standardized with Grove Interface. Powerful MCU to Enrich Your Applications. Specification Operating Voltage: 3.3V~5.5V (typical at 5V) Operating Current: 28 mA (Maximum Operating Current: 40 mA) MCU Frequency: 64 MHz Operating Frequency: 105±5kHz Hall Effect Filed Strength Range: |0.5| ~ |8| mT For more detail, please visit: http://www.seeedstudio.com/item_detail.html?p_id=2586 [1]: /editor/20160118/569cc3fa96a82.png