【LiChuang Development Board】Smart Car

I. Functional introduction
1. LED: simulate car lighting system
2. Button: switch operation mode
3. Passive buzzer: simulate car horn
4. Ultrasonic obstacle avoidance: there is an obstacle ahead, ultrasonic obstacle avoidance makes the car safer
5. Infrared photoelectric tube: realize the unmanned driving tracking function of the car
6. Bluetooth module: control the car driving through the mobile phone APP
II. Overall design plan
This design uses two lithium batteries with a total of 7.4V as the system power supply. After stepping down to 5V, it powers the single-chip microcomputer system. The single-chip microcomputer, button circuit, tracking circuit, obstacle avoidance circuit, LED car lights, passive buzzer, Bluetooth, and motor drive circuit are connected.
III. Hardware introduction
3.1 Power input:
The power supply is an important part of the entire circuit. In terms of power selection, this project uses a 7.4V rechargeable lithium battery. The motor drive chip is directly provided by the battery 7.4V. When the switch SW1 is turned on, the system starts to power. ![Snipaste_2023-02-26_22-00-05.jpg] 3.2 Motor drive circuit
![Snipaste_2023-02-26_22-01-12.jpg] 3.3 Tracking circuit
The car usually tracks along a black line on a white floor, and uses the reflection of infrared light in different colors for identification. Feedback to the microcontroller through the comparator.
![Snipaste_2023-02-26_22-02-06.jpg] 3.4 Other circuits
In addition to realizing the basic tracking and obstacle avoidance functions of the car, in order to further optimize the functions of the car, buttons are designed for function switching and code debugging.
![Snipaste_2023-02-26_22-02-50.jpg] ![Snipaste_2023-02-26_22-03-07.jpg]