{"id":42609,"date":"2026-04-27T08:33:21","date_gmt":"2026-04-27T08:33:21","guid":{"rendered":"https:\/\/roboticaplus.com\/?post_type=product&#038;p=42609"},"modified":"2026-04-27T08:33:21","modified_gmt":"2026-04-27T08:33:21","slug":"serial-bus-servo-driver-hat-with-esp32-for-st-rsbl-servos-integrated-control-circuit","status":"publish","type":"product","link":"https:\/\/roboticaplus.com\/he\/product\/serial-bus-servo-driver-hat-with-esp32-for-st-rsbl-servos-integrated-control-circuit\/","title":{"rendered":"Serial Bus Servo Driver HAT with ESP32, for ST\/RSBL Servos, Integrated Control Circuit"},"content":{"rendered":"<p>Serial Bus Servo Driver HAT with ESP32, for ST\/RSBL Servos, Integrated Control Circuit<\/p>\n<p>Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST \/ RSBL Series Serial Bus Servos<\/p>\n<div class=\"overviewSec\">Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST \/ RSBL Series Serial Bus Servos<\/div>\n<div class=\"richWrap\">\n<div class=\"pdT\">\n<div class=\"richTitle\">Serial bus servo driver HAT<\/div>\n<p class=\"hilitBlock3 round1234\">Designed for Serial Bus Servos, Integrates ESP32 and Servo Control Circuit<\/p>\n<p class=\"richDesc pdTRBL\">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<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-1.jpg\" alt=\"Serial Bus Servo Driver HAT, front view\" \/><\/p>\n<\/div>\n<div class=\"pdT\">\n<div class=\"richTitle\">Features at a glance<\/div>\n<div class=\"alignl pdTRBL2\">\n<ul>\n<li>Allows controlling up to 253 ST \/ RSBL series serial bus servos at the same time<\/li>\n<li>9~25V wide voltage input (the input voltage and the servo voltage must be matched)<\/li>\n<li>Based on the ESP32-WROOM-32 module, supports wired and wireless communication<\/li>\n<li>Provides multiple control demos for different host controllers<\/li>\n<li>Supports controlling the serial bus servos directly via onboard USB Type-C port<\/li>\n<li>Supports connecting to Raspberry Pi, powering the Pi via integrated 5V buck regulator circuit and communicating through GPIO UART interface, neat cable management<\/li>\n<\/ul>\n<\/div>\n<div><\/div>\n<\/div>\n<div>\n<div class=\"richTitle\">Specifications<\/div>\n<table class=\"tabSty-2 alignl mgnTB\">\n<tbody>\n<tr>\n<th>Controller<\/th>\n<td>ESP32-WROOM-32<\/td>\n<\/tr>\n<tr>\n<th>Power supply Port<\/th>\n<td>XT60 connector, 5.5\u00d72.5 mm DC jack<\/td>\n<\/tr>\n<tr>\n<th>Power Supply<\/th>\n<td>9~25V (the input voltage and the servo voltage must be matched)<\/td>\n<\/tr>\n<tr>\n<th>Communication interface<\/th>\n<td>UART, USB Type-C port \u00d7 2<\/td>\n<\/tr>\n<tr>\n<th>Wireless communication<\/th>\n<td>2.4G WiFi<\/td>\n<\/tr>\n<tr>\n<th>Mounting hole diameter<\/th>\n<td>3 mm<\/td>\n<\/tr>\n<tr>\n<th>mounting hole spacing<\/th>\n<td>58\u00d749 mm<\/td>\n<\/tr>\n<tr>\n<th>PCB size<\/th>\n<td>65\u00d757 mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"shdwImg\">\n<div class=\"richTitle\">Application examples<\/div>\n<ul class=\"alignl\">\n<li>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<\/li>\n<li>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.<\/li>\n<li>Ideal choice for building quadruped robots, hexapod walkers, robotic arms and other robotic projects requiring multiple servos<\/li>\n<\/ul>\n<div class=\"richGridWrap richGridWrap-2c richGridWrap-valignTop mgnTB\">\n<div><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-3-1.jpg\" alt=\"Serial Bus Servo Driver HAT for building quadruped robots\" \/><\/div>\n<div><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-3-2.jpg\" alt=\"Serial Bus Servo Driver HAT for building hexapod walkers\" \/><\/div>\n<\/div>\n<p class=\"note\">* images here are for reference ONLY<\/p>\n<\/div>\n<div class=\"pdT\">\n<div class=\"richTitle\">Compatible Servos<\/div>\n<p class=\"richDesc pdTRBL\">Supports ST \/ RSBL series bus servos and selecting power supply input according to the servo used<\/p>\n<div class=\"richGridWrap\">\n<div><a href=\"https:\/\/www.waveshare.com\/st3215-servo.htm\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-1.jpg\" \/><\/a><br \/>\nST3215 Servo<\/p>\n<div><\/div>\n<\/div>\n<div><a href=\"https:\/\/www.waveshare.com\/st3215-hs-servo-motor.htm\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-2.jpg\" \/><\/a><br \/>\nST3215-HS<br \/>\nServo Motor<\/div>\n<div><a href=\"https:\/\/www.waveshare.com\/st3025-servo.htm\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-3.jpg\" \/><\/a><br \/>\nST3025 Servo<\/p>\n<div><\/div>\n<\/div>\n<div><a href=\"https:\/\/www.waveshare.com\/st3020-servo.htm\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-4.jpg\" \/><\/a><br \/>\nST3020 Servo<\/p>\n<div><\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div class=\"richGridWrap\">\n<div><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-5.jpg\" \/><br \/>\nRSBL45-24<\/p>\n<div><\/div>\n<\/div>\n<div><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-6.jpg\" \/><br \/>\nRSBL85-12<\/p>\n<div><\/div>\n<\/div>\n<div><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-7.jpg\" \/><br \/>\nRSBL85-24<\/p>\n<div><\/div>\n<\/div>\n<div><img decoding=\"async\" class=\"round1234\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-5-8.jpg\" \/><br \/>\nRSBL120-24<\/p>\n<div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"msg msg_warning\"><strong>Note:<\/strong>\u00a0When 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.<\/div>\n<div>\n<div class=\"richTitle\">UART serial bus control<\/div>\n<p class=\"richDesc\">Allows controlling up to 253 serial bus servos at the same time<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-7.jpg\" alt=\"Serial Bus Servo Driver HAT, supports UART serial bus control\" \/><\/p>\n<p class=\"note\">* for reference only, the servos in the picture are NOT included.<\/p>\n<div class=\"msg msg_info\"><strong>Note:<\/strong>\u00a0though one channel UART can control up to 253 bus servos, due to the high power of the servos, it is necessary to consider whether the power supply solution is enough when using too many servos.<\/div>\n<\/div>\n<div class=\"pdT\">\n<div class=\"richTitle\">Wired Control Mode<\/div>\n<p class=\"richDesc pdTRBL\">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.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-9.jpg\" alt=\"Serial Bus Servo Driver HAT, supports Wired Control Mode\" \/><\/p>\n<div class=\"richTitle\">Wireless Control Mode<\/div>\n<p class=\"richDesc pdTRBL\">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<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-11.jpg\" alt=\"Serial Bus Servo Driver HAT, supports Wireless Control Mode\" \/><\/p>\n<\/div>\n<div>\n<div class=\"richTitle\">Suitable for Raspberry P 5 \/ 4B<\/div>\n<p class=\"richDesc pdTRBL\">Supports powering the Pi and communicating through GPIO UART interface, neat cable management<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-13.jpg\" alt=\"Serial Bus Servo Driver HAT, suitable for Raspberry P 5 \/ 4B\" \/>\u00a0<img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-inter.jpg\" alt=\"Serial Bus Servo Driver HAT, pin definition\" \/><\/p>\n<\/div>\n<div class=\"pdT\">\n<div class=\"richTitle\">ESP32 Controller, Extensive Resources<br \/>\nEasy Secondary Development<\/div>\n<p class=\"richDesc pdTRBL\">Built-In WiFi And Bluetooth, As Well As ESP-NOW Support, For Remote Control And Servo Debugging<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-17.jpg\" alt=\"Serial Bus Servo Driver HAT, onboard ESP32 controller\" \/><\/p>\n<\/div>\n<div>\n<div class=\"richTitle\">What\u2019s On Board<\/div>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-intro.jpg\" alt=\"Serial Bus Servo Driver HAT, onboard resources\" \/><\/p>\n<div class=\"richGridWrap richGridWrap-valignTop richGridWrap-2c alignl subBlock bgGrey\">\n<div>\n<ol>\n<li><strong>ESP32 module<\/strong><\/li>\n<li><strong>DCDC 5V buck regulator<\/strong><\/li>\n<li><strong>UART control switch<\/strong><\/li>\n<li><strong>Reset button<\/strong><\/li>\n<li><strong>BOOT button<\/strong><br \/>\nfor entering downloading mode<\/li>\n<li><strong>Raspberry Pi 40PIN header<\/strong><\/li>\n<li><strong>ESP32 Type-C port<\/strong><\/li>\n<\/ol>\n<\/div>\n<div>\n<ol start=\"8\">\n<li><strong>Serial bus servo Type-C port<\/strong><\/li>\n<li><strong>XT60 connector<\/strong><\/li>\n<li><strong>5.5\u00d72.5 DC power jack<\/strong><\/li>\n<li><strong>Power supply screw terminal<\/strong><\/li>\n<li><strong>RS485 serial bus servo header<\/strong><\/li>\n<li><strong>TTL serial bus servo headers<\/strong><\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div class=\"richTitle\">Outline dimensions<\/div>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/Bus-Servo-Driver-HAT-A\/Bus-Servo-Driver-HAT-A-details-size.jpg\" alt=\"Serial Bus Servo Driver HAT, outline dimensions\" \/><\/p>\n<\/div>\n<div>\n<div class=\"richTitle\">Resources &amp; Services<\/div>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/LCD\/common\/res_banner.png\" \/><\/p>\n<div class=\"bgGrey\"><strong>Wiki:\u00a0<\/strong><a href=\"http:\/\/www.waveshare.com\/wiki\/Bus_Servo_Driver_HAT_(A)\" target=\"_blank\" rel=\"noopener noreferrer\">www.waveshare.com\/wiki\/Bus_Servo_Driver_HAT_(A)<\/a><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Serial Bus Servo Driver HAT with ESP32, for ST\/RSBL Servos, Integrated Control Circuit Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST \/ RSBL Series Serial Bus Servos Serial Bus Servo Driver HAT, Integrates ESP32 and Servo Control Circuit, Suitable for ST \/ RSBL Series Serial Bus Servos Serial bus [&hellip;]<\/p>\n","protected":false},"featured_media":42613,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[510],"product_tag":[],"class_list":{"0":"post-42609","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esp32-8266","9":"first","10":"instock","11":"sale","12":"taxable","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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