Product details

Bus Servo Driver HAT (A)

Robot Control Boards and Computing Components

Waveshare

Bus Servo Driver HAT (A)

About this product

Waveshare Bus Servo Driver HAT (A) is a programmable ESP32 robot controller with TTL and RS485 serial-servo interfaces. It supports JSON commands and feedback through a host connection, direct USB servo communication and an onboard wireless web application. A 5 V buck regulator and 40-pin header allow connection to a Raspberry Pi. The stated 253-servo bus capacity depends on sufficient power, and the 9–25 V input must match every connected servo. Current commercial availability and release date are unverified.

Model
Bus Servo Driver HAT (A)
Category
Robot Control Boards and Computing Components, Components

Specifications & evidence

Source-backed claims. Configuration, workload and evidence type matter when comparing products.

Additional power connection

Screw terminal

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Power supply screw terminal

Bus electrical interfaces

RS485 and TTL

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
RS485 serial bus servo header TTL serial bus servo headers

Communication interfaces

UART; two USB Type-C ports

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Communication interface UART, USB Type-C port × 2

Controller module

ESP32-WROOM-32

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Controller ESP32-WROOM-32

Host feedback format

JSON

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
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.

Host header

40 pins

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Raspberry Pi 40PIN header

Host regulator output

5 V

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Supports connecting to Raspberry Pi, powering the Pi via integrated 5V buck regulator circuit and communicating through GPIO UART interface, neat cable management

Mixed-servo power requirement

Input must meet every connected servo requirement

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
When using the different servo models at the same time, please pay attention to whether the power input can meet the requirements of all the servos.

Mounting hole diameter

3 mm

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Mounting hole diameter 3 mm

Mounting hole spacing

58 × 49 mm

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
mounting hole spacing 58×49 mm

Pcb dimensions

65 × 57 mm

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
PCB size 65×57 mm

Power connectors

XT60 and 5.5 × 2.5 mm DC jack

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Power supply Port XT60 connector, 5.5×2.5 mm DC jack

Serial-servo address capacity

253 servos

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Theoretical bus-address capacity for ST/RSBL servos; sufficient power required, and all connected servo voltages must match the selected input.

Bus Servo Driver HAT (A) - Waveshare Wiki
Allows controlling up to 253 ST / RSBL series serial bus servos at the same time (sufficient power supply required)

Servo feedback

Position, speed, torque lock and operating mode

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
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

Supply voltage

9–25 V

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Power Supply 9~25V (the input voltage and the servo voltage must be matched)

Wifi band

2.4 GHz

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Wireless communication 2.4G WiFi

Wired command modes

JSON to ESP32 or direct USB servo commands

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
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.

Wireless communication

WiFi, Bluetooth, ESP-NOW

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
Built-In WiFi And Bluetooth, As Well As ESP-NOW Support, For Remote Control And Servo Debugging

Wireless control interface

Hosted cross-platform web application

Manufacturer specification

Configuration: Bus Servo Driver HAT (A); Manufacturer exact-model board specification. External motors, servos and host computers are not included in this board rating.

Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST / RSBL Series Serial Bus Servos | Bus Servo Driver HAT (A)
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

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