Features 1.Serial Bus Servo Driver HAT Designed for Serial Bus Servos, Integrates ESP32 and Servo Control Circuit Allows Controlling Up To 253 Serial Bus Servos At The Same Time Via ESP32 UART Or USB Port, Can Be Used As The Main Controller Of The Robotics Projects 2.Compatible Servos Supports ST / RSBL Series Bus Servos And Selecting Power Supply Input According To The Servo Used 3.UART Serial Bus Control Allows Controlling Up To 253 Serial Bus Servos At The Same Time 4.Wired Control Mode Supports Sending JSON Commands To ESP32 For Controlling The Serial Bus Servos, Or Directly Sending Control Commands To The Servos Via USB Type-C Port. Comes With Python Demo. 5.Wireless Control Mode The Bus Servo Driver HAT (A) Will Automatically Establish A Hotspot After Powering On, Allows Users To Connect And Control The Driver Board Via Mobile Phones, Tablets And PCs With The Cross-Platform Web Application We Provided 6.Suitable For Raspberry P 5 / 4B Supports Powering The Pi And Communicating Through GPIO UART Interface, Neat Cable Management 7.ESP32 Controller, Extensive Resources Easy Secondary Development Built-In WiFi And Bluetooth, As Well As ESP-NOW Support, For Remote Control And Servo Debugging Application Examples Servos will provide various feedback like position, speed, torque lock, and operating mode (servo mode, servo motor mode, etc.) for advanced projects requiring closed-loop automatic control The host controller can control the serial bus servos by sending JSON commands and obtain feedback information in JSON format, more convenient for secondary development. Ideal choice for building quadruped robots, hexapod walkers, robotic arms and other robotic projects requiring multiple servos Package Content Bus Servo Driver HAT (A) x1 2×20 pin header x1 USB-A to USB-C cable x1 Screws pack x1