Intelligent car based on Liangshan School

This circuit is based on the car of Liangshan School.
Its onboard functions include
1. Independent lithium battery charging circuit: After turning off the power of the car, plug in the TYPE-C socket to charge the battery
2. Three-way tracking module: three infrared reflection detections to detect black line tracking
3. Motor control chip: The high and low levels of the two IO ports output by the single-chip microcomputer can control the motor's forward, backward, brake, and suspended modes. The speed can also be adjusted through PWM control
4. Power conversion circuit: The 7.4v voltage output by the lithium battery is converted into a 5v voltage to power the single-chip microcomputer and set a power switch to turn on and off the car.
5. Ultrasonic module: Detect obstacles in front through the ultrasonic module
6. Wireless and Bluetooth module: Remotely control the movement of the car through the wireless module and the Bluetooth module. The wireless module can be wirelessly controlled through 2.4g, and the Bluetooth can be controlled by a mobile phone
7. Buzzer: Use the buzzer to warn, such as with the power display to remind low power or with the ultrasonic module to remind obstacles in front.
8. Battery display: Use an ADC port of Liangshan School to convert analog voltage into digital quantity to obtain battery information
9. Buttons: Two buttons to set the switching of different functions or control LED lights