The Elecfreaks ring: bit car is a small DIY smart car driven by the BBC micro: bit. The ring: bit extends the micro: bit's 3 GPIO ports and allow for different sensors and components to be easily attached to the micro: bit. A basic ring: bit car can be easily programmed to run autonomously, with a remote control, and even create rainbow beacons of light. Just add one of the many extensions available and your ring: bit car can do even more things like line and light following, obstacle avoiding, drawing and more.

The micro: bit can drive it directly with the input voltage of this module in 3V ∼ 5V
It only needs one IO port it with standard 3-pin GVS ports
It uses the infrared light to detect with a strong anti interface capability