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The design of robot design report seesaw robot using AT89C51 Series MCU as the core of the control and data processing, through the infrared reflection of the collected information is in the car seesaw tracing forward, balance the SCA60C tilt sensor angle is detected that small cars, so as to control the positive and negative L298N stepper motor drive and motor. The car forward, backward and turn, until the car balance on the seesaw. In addition the design using the LCD display of the car running time and state display. The car can automatically find the balance point in the seesaw, real-time display of electric vehicle travel time and equilibrium position can also add weight to finish the task in the case.