In order to realize the automatic following function of the balance car, it is necessary to determine the position between the people and the intelligent car by using the ultrasonic sensors of different positions, and to measure the distance between the people and the balance car by using the high-frequency ultrasonic sensors The distance between people and cars. In this design, the single receiving and transmitting ultrasonic sensor is used. The single receiving and transmitting ultrasonic sensor is installed at the two ends of the vehicle. The simple schematic diagram of its composition is shown in Figure 2.3. The ultrasonic sensor and the remote controller held by people form a triangle shape. When people are on the middle line of the two ultrasonic sensors, the distance between people and the two sensors is equal; when people turn left or right, people and When the distance of the sensor deviates from the preset distance, the car will adjust the route immediately to meet the walking route of people, so as to realize the automatic follow function of ultrasonic sensor.<br>
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