ADD：One kilometer South East River Temple arch
Troll is a kind of plastic toy for children. It is designed with three wheels and has good stability. It is popular among children aged one to five.
1. The Twister is similar to the body's own balance system. The wheels of the Twister are instead of the feet. When you adjust your own center of gravity, the system will control the speed difference between the left and right sides accordingly, to achieve steering.
2, twisting car adopts the principle of dynamic balance, using its internal gyroscope and acceleration sensor, to detect the body attitude changes, and the use of servo control system, accurately drive the motor for corresponding adjustment, in order to maintain the balance of the system.