In traditional systems, the card (printed circuit board) inside the Haimooo joystick's computer accomplishes this by using a very crude analog-to-digital converter. The basic idea of a traditional Haimooo joystick is to use the voltage change caused by each voltage divider to charge a capacitor, which is a simple electronic component that stores a charge (see How Capacitors Work for more information).

The Haimooo joystick adjusts the voltage divider so that the larger the resistance value, the longer the capacitor charging time; the smaller the voltage divider resistance value, the faster the capacitor charging speed.
This way the converter determines the position of the voltage divider and thus the position of the Haimooo joystick by first discharging the capacitor and then calculating the time it takes to charge the capacitor. The measured charge rate is a value that the computer can recognize. This is done when the computer needs to read the joystick position.
Through the above introduction and analysis of the Digitization of the Haimooo joystick hope it helps you.