This driver HAT has been made to control up to 253 serial bus servos simultaneously. It uses the ESP32-WROOM-32 module for wired and wireless communication, making it ideal for robotics projects such as quadruped robots, hexapod walkers, and robotic arms. It supports 9-25V wide voltage input and features multiple control demos. It connects to Raspberry Pi, providing power via a 5V buck regulator and communicates through the GPIO UART interface. The HAT also supports JSON command communication for advanced control and feedback. Features * Allows controlling up to 253 ST / RSBL series serial bus servos at the same time * 9~25V wide voltage input (the input voltage and the servo voltage must be matched) * Based on the ESP32-WROOM-32 module, supports wired and wireless communication * Provides multiple control demos for different host controllers * Supports controlling the serial bus servos directly via onboard USB Type-C port * Supports connecting to Raspberry Pi, powering the Pi via integrated 5V buck regulator circuit and communicating through GPIO UART interface, neat cable management What's on Board * ESP32 module * DCDC 5V buck regulator * UART control switch * Reset button * BOOT button For entering download mode * Raspberry Pi 40PIN header * ESP32 Type-C port * Serial bus servo Type-C port * XT60 connector * 5.5×2.5 DC power jack * Power supply screw terminal * RS485 serial bus servo header * TTL serial bus servo headers Specifications Controller ESP32-WROOM-32 Power Supply Port XT60 connector, 5.5 x 2.5 mm DC jack Power Supply 9~25V (the input voltage and the servo voltage must be matched) Communication Interface UART, 2x USB Type-C port Wireless Communication 2.4G WiFi Mounting Hole Diameter 3 mm Mounting Hole Spacing 58 x 49 mm PCB Size 65 x 57 mm Connection Example - Raspberry Pi & Servo Resources * Product Wiki * Schematics Pinout Package Contents * 1x Bus Servo Driver HAT (A) * 1x 2 x 20-pin header * 1x USB-A to USB-C cable * 1x Screws pack https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2024-06-19 https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2024-09-18 https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2024-11-29 https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2024-11-30 https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2025-02-13 https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2025-08-06 https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2025-11-28 https://elecena.pl/product/26097049/serial-bus-servo-driver-hat-for-raspberry-pi-with-esp32 2025-11-29