STC8H8K64U Robot Arm Cart Bluetooth Control Board

This STC8H8K64U-based quadruped robot arm/360-degree servo motor Bluetooth control board
can be used as a control board for servo-based quadruped robots, robotic arms, and cars. It allows for convenient modification and monitoring of various parameters via Bluetooth, and also enables debugging of all PWM-based modules. It features 8 adjustable duty cycle and period PWM channels, and further functionality can be achieved through code modification.
Advantages include:
1. Small size, occupying less than two bottle caps (51mm x 46mm);
2. An added OLED display module for convenient debugging and increased expandability,
displaying current serial port reception information (UART, MS) ,
duty cycle of the 8 PWM channels,
Bluetooth connection status, 
and quick preview of currently modified PWM values
; 3. Convenient Bluetooth module control, using a mobile phone as a remote control.
This app is written using App Inventor's visual programming interface and only supports basic functions,
controlling 8 PWM channels via Bluetooth modules (HC-05, JDY-31, etc.)
; 4. Utilizing STC's USB-to-serial conversion function, it allows direct USB program download, supports uninterrupted downloading, and facilitates code debugging.
A physical demonstration is available (see attached video).