小型直流电机专用驱动器，所用芯片L293属于H桥集成电路，其输出电流为

A special driver for small DC motors. The chip L293 used is an H-bridge integrated circuit. Its output current is 1000mA, the highest current is 2A, and the highest working voltage is 36V. It can drive inductive loads, especially its input can be directly connected to the microcontroller, which is very convenient The ground is controlled by the microcontroller. When driving a small DC motor, two motors can be directly controlled, and the motor can be rotated forward and reversely. To achieve this function, only the logic level of the input terminal needs to be changed. This module has the characteristics of small size and convenient control. Adopting this module will make your motor control freely, and deal with car problems easily and freely. The driving principle diagram is shown in the figure. The <br><br>principle of the car tracking is that the car is driving on the white paper "road" with black lines. Because the black line and the white paper have different reflection coefficients of light, it can be judged according to the intensity of the received reflected light. "Road"-the black line. In this module, the author uses a simple, widely-used detection method—infrared detection method. <br>Infrared detection method, which uses infrared light to have different reflection properties on the surface of different colors of objects, and continuously emit infrared light. When the infrared light encounters a white obstacle, it will be diffusely reflected, and the reflected light will be received oppositely. The tube receives; if it encounters a black object, the infrared light is absorbed, and the receiving tube cannot receive the infrared light. Send the result of the receiving tube to the microcontroller. The single-chip microcomputer performs corresponding processing on the basis of whether it receives the reflected infrared light. According to its characteristics, it can be used for tracing or obstacle avoidance of smart cars. The white infrared pair tube is the emission tube, and the long pin is the positive electrode, which is connected to the high potential. The black is the receiving tube, the long pin is grounded, and the short pin is connected to a high potential. The circuit diagram is shown in Figure 3-3.

Small DC motor dedicated driver, the chip L293 is an H-bridge integrated circuit, its output current of 1000mA, the highest current 2A, the highest operating voltage of 36V, can drive the inductive load, especially its input can be directly connected with the microcontroller, so that it is convenient to be controlled by the microcontroller. When driving a small DC motor, two motors can be directly controlled and motor forward and reverse can be achieved, enabling this function to simply change the logic level of the input. This module has the characteristics of small size and convenient control. With this module, you'll be free to control your motor and handle the car's problems with ease. The driving schematic is shown in the figure<br><br>The principle of trolley track is that the car is drawn on the black line of white paper "road", because the black line and white paper reflect light coefficient is different, according to the received reflection of light strength to judge the "road" - black line. In this module, the author makes use of the simple and common detection method, infrared detection method.<br>Infrared detection method, that is, the use of infrared in different colors of the surface of the object has different reflective properties, constantly emitting infrared light, when infrared light encountered white obstacles diffuse, reflected light is received by the opposite receiving tube; Send the results of the receiving tube to the microcontroller. The microcontroller processes whether it receives reflected infrared light. Depending on its characteristics, it can be used to find or avoid obstacles in smart cars. Infrared tube white for the transmitter tube, long pin for the positive pole, high potential. Black is the receiving tube, long pin ground, short pin high potential. The circuit diagram is shown in Figure 3-3.

The chip l293 is an H-bridge integrated circuit. Its output current is 1000mA, the maximum current is 2a, and the maximum working voltage is 36V. It can drive inductive load, especially its input end can be directly connected with single chip microcomputer, so it is easily controlled by single chip microcomputer. When driving a small DC motor, it can directly control two-way motors, and can realize the forward and reverse rotation of the motor. To achieve this function, only the input logic level needs to be changed. This module has the characteristics of small volume and convenient control. Using this module will make your motor control freely and deal with the car easily. The drive schematic diagram is shown in Fig<br>The principle of car tracking is that the car runs on the white paper "road" with black line. Because the reflection coefficient of black line and white paper to light is different, the "road" - black line can be judged according to the strength of the reflected light received. In this module, the author uses a simple and common detection method infrared detection method.<br>Infrared detection method, that is, the use of infrared in different colors of the object surface has different reflective properties, constantly emit infrared light, when the infrared light meets white obstacles, diffuse reflection occurs, the reflected light is received by the opposite receiver; if the black object is encountered, the infrared light is absorbed, the receiver can not receive infrared light. The result of receiving tube is sent to MCU. The microcontroller will process the reflected infrared light. According to its characteristics, it can be used for tracking or obstacle avoidance of intelligent car. The white infrared pair tube is the emitter tube, and the long pin is the positive pole, which is connected with high potential. Black is the receiver, the long pin is grounded, and the short pin is connected to high potential. The circuit diagram is shown in Figure 3-3.<br>