introduction
This article mainly designs a smart car that can autonomously recognize the road. The entire system uses a 16-bit microcontroller mc9s12dg128. The model car itself has a differential and rear-wheel drive. It is necessary to design and complete an automatic control system based on a single-chip computer so that the model car can automatically follow the line on the closed runway.
The car model and the controller form an automatic control system. As shown in Figure 1, the system hardware is based on the single chip microcomputer, equipped with sensors, actuators and their drive circuits, and the information processing and control algorithms are completed by the single chip microcomputer software. The system design requires the single chip microcomputer to combine the rapid judgment of the path, the corresponding steering servo motor control and the control of the DC drive motor precisely.
The design of the smart car is based on the principle of simple circuit design and high flexibility of the car body on the premise of ensuring the reliable operation of the model car. The two key points of the design are the layout and circuit design of the photoelectric sensor, and the design of the line control algorithm.
The second section of this article mainly introduces the circuit design and layout of the photoelectric sensor, which is the key to signal acquisition, which is equivalent to the "eye" of the smart car; the third section mainly introduces the line control algorithm, which is the core of control, which is equivalent to The "mind" of the smart car; finally, the hardware and software design and experiment of the smart car are explained in Section IV.
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