Obstacle avoidance and tracking Bluetooth car based on [LiChuang Liangshan School]

Based on the intelligent car of Lichuang Liangshan School, the functions include tracking, obstacle avoidance, and Bluetooth remote control.
The specific composition is as follows: Functions that have been realized
1. Obstacle avoidance mode: When the car encounters an obstacle, it can move left and right to avoid the obstacle.
2. Tracking mode: The car can track along the black line on the ground
3. Bluetooth remote control: remote control the car to move forward, backward, left, right, left, right, and stop.
 
Current problems:
1. Due to PCB design errors, the interface direction of the RX and TX of the onboard HC-05 interface is opposite to the actual direction, so DuPont wires are required to connect.
2. If the battery is low, the car moves, which may cause the main control to restart.
3. Because the button is detected using a while loop, the response speed is slow.
 
Improvement direction:
1. Use rechargeable lithium batteries and improve the power design.
2. Optimize and beautify the display interface of the 0.96-inch OLED.
3. Improve the PCB board.
4. Optimize the code to achieve more functions.
 
Gains:
1. In the past, I only learned how to use each peripheral and module separately, but through this training camp, I successfully integrated these modules so that each function can run normally.
2. Through this training camp, I used the EasyEDA Professional Edition for manual wiring and learned some PCB wiring rules and techniques. This is my first time to do manual wiring. Before that, I used the standard version for automatic wiring.
3. I am a little familiar with the procurement and management of materials.