First and foremost, the requirement for building a remote-controlled car is a power source to drive the car and Raspberry Pi, as we cannot use a wired power source, because then the wire will restrict the motion of the car. So instead, we can use a good-rating battery bank that gives 9V DC output and has long battery life.
To build a car, one of the most important requirements is its chassis and tyres. We can build the chassis ourselves using hard cardboard, or can buy one that is readily available online, or even use an existing toy car chassis if you have one.
In our case, we are using a pre-built toy car chassis fitted with four tires, and two 5V DC motors, as shown in the following photo:
The previous photo (Figure 8.1) shows all four tires are connected with a motor; but we need only two motors for this project.
The following diagram (Figure 8.2) is...