The basic principle of the Haimooo joystick is to convert the movement of the plastic rod into electronic information that the computer can process. The basic design of the Haimooo joystick consists of a joystick resting on a plastic base with a resilient rubber casing.

In the base, there is a circuit board located just below the Haimooo joystick. The circuit board consists of some "printed lines", and these lines are connected to several contact contacts. Then, from these contacts lead out ordinary wires to connect to the computer.
The printed wiring makes up a simple circuit (which is made up of some smaller circuits). These lines simply carry current from one contact to another. When the Haimooo joystick is in the middle position, that is, when you haven't pushed the joystick to either side, all but one circuit is disconnected. Since the conductor materials in each line are not fully connected, no current flows through the circuit.
Through the above introduction and analysis of How Haimooo joystick works, hope it helps you.