Control a slider with stepper motor and ultrasonic distance sensor to a specified position.
Test videos: https://www.bilibili.com/video/BV1yD4y1s7Gp/?share_source=copy_web&vd_source=848a0bdee68da7365b0da106937491c6
Tested on ESP32, SR-04 ultrasonic sensor, and A4988 stepper motor driver carrier