Throughout February, I spent most of my time adjusting the PCB design completed in the last quarter, in order to reach the ideal design of the team. In the first part of the improvement, I started with the reduction of space utilization, so that the whole design has more and more space to realize the placement of other needed parts. The first is to reduce the space on the left and right sides, so that the devices are concentrated in the middle. But at the same time, we wanted to make the sensor system of the car both in front of the car and behind the car, so we needed to put the same design on the board. For this I need to make the design take up only half of the board. This makes the design of the internal circuit need to be very fine, in a small space around. Finally, two identical systems need to be connected. After all this was completed, I began to design the shell of the car, but it was an unused system, it took me some time to learn.