Waveshare ESP32‑S3 Relay 6CH is an industrial‑grade relay control board designed for IoT, automation, and smart home applications. Powered by the ESP32‑S3 dual‑core processor, it supports Wi‑Fi, Bluetooth LE, and an onboard isolated RS485 interface for reliable communication with Modbus devices. The board integrates six high‑quality relays (≤10A 250VAC / 30VDC) with optocoupler and digital isolation, ensuring safe and stable operation even in demanding environments. A 40‑pin Pico HAT compatible header allows expansion with modules such as RTC, CAN, RS232, or LoRa, while the rail‑mounted ABS case provides secure installation. With wide voltage input (7–36V), USB Type‑C for programming, and built‑in indicators, this module offers a flexible and dependable solution for industrial and AIoT projects. Key Features High‑Performance MCU — ESP32‑S3, Xtensa® 32‑bit LX7 dual‑core @ 240 MHz with AI computing capabilities and encryption. Wireless & Wired Connectivity — Integrated 2.4 GHz Wi‑Fi + Bluetooth 5 LE; onboard isolated RS485 port. 6 Quality Relays — Contact rating ≤ 10 A 250 VAC / 30 V DC; direct control of high‑voltage appliances or DC loads. Industrial‑Grade Isolation — Power isolation, optocoupler isolation, and digital signal isolation for enhanced safety. Pico HAT Expansion — 40‑pin header compatible with Raspberry Pi Pico HATs (add RTC, CAN, RS232, LoRa, sensors, etc.). Robust Protection — TVS diodes, surge suppression, ESD protection, and onboard matching resistor (enable via jumper). User Indicators — RGB LED, power indicator, RS485 TX/RX LEDs, and onboard buzzer for status feedback. Flexible Power Input — USB‑C or 7–36 V DC via screw terminal; onboard isolated power output for RS485 devices. Compact DIN‑Rail Enclosure — ABS case for safe, easy installation. Specifications Microcontroller ESP32-S3 (Default module: ESP32-S3-WROOM-1U-N16, customizable for other modules) Wireless communicatoin 2.4GHz WiFi (802.11 b/g/n)、Bluetooth 5, BLE USB Connector USB Type-C Power supply 5V Functions Power supply, USB communication, firmware downloading, etc. ISOLATED RS485 Connector Screw terminal Direction control Hardware automatic control Protection TVS diode, surge protection & ESD protection Resistor Onboard reserved 120R matching resistor, NC by default, enabled via jumper Expanded interface Onboard 40PIN header compatible with some Raspberry Pi Pico HAT, easy to expand other functions such as RTC / CAN / RS232 / LoRa / sensor, etc Relay Contact rating ≤10A 250VAC/30VDC Relay channels 6 Contact form 1NO 1NC Isolation Optocoupler isolation LED indicators RGB RGB colorful LED, supports programmable control for display color PWR Red power indicator, lights up when there is USB connection and voltage is detected TXD Green TX indicator, lights up when the RS485 port sends data RXD Blue RX indicator, lights up when the device port sends data back power supply Screw terminal Voltage range 7~36V Appearance Enclosure Rail-mount ABS protective case Dimensions 145 × 90 × 40mm Part List ESP32-S3-Relay-6CH x1 2.4G 4DB SMA antenna x1 Screwdriver x1 Onboard multiple isolation protection circuit Multiple protections, more safe and reliable High quality 6-Ch relays, supports RS485 and Bluetooth / WIFi remote control Contact rating of the onboard relay up to 10A 250VAC/30VDCDirectly controlling 220VAC home appliances, or devices below 30VDC Onboard Pico HAT compatible interface and RS485 interface for easy expansion Onboard isolated RS485 interface, for connecting to various RS485 Modbus industrial modules or sensors. Onboard 40PIN header compatible with some Raspberry Pi Pico HAT, for expanding more functions such as RTC / CAN / RS232 / LoRa / sensor, etc. Supports Arduino, Micropython development Comprehensive SDK, Dev Resources, And Tutorials To Help You Easily Get Started Applications Industrial equipment control and monitoring Home and building automation Remote IoT relay switching via Wi‑Fi / Bluetooth / RS485 Sensor‑triggered relay control with full electrical isolation Integration with Arduino, MicroPython, ESPHome, Home Assistant, and custom firmware Support Batch Customization Support software and hardware customizationIncluding hardware interface, LOGO, label, case and web page, etc. What's On Board ESP32-S3up to 240MHz operating frequency, with 2.4GHz WiFi and BLE 6-channel quality relayscontact rating per channel: ≤10A 250V AC or ≤10A 30V DC Optocoupler isolationprevents interference from external high-voltage circuit connected to the relay Digital isolationprevents interference from external signal Power supply isolationprovides stable isolated voltage, needs no extra power supply for the isolated terminal TVS diodeeffectively suppresses surge voltage and transient spike voltage in the circuit Ceramic gas discharge tube Relay screw terminalsfor connecting with user devices 40PIN Raspberry Pi Pico HAT header RS485 bus interfacefor connecting to external RS485 devices Power supply screw terminalSupports DC 7~36V wide voltage input LED indicatorsPWR: power indicatorRXD: RS485 RX indicatorTXD: RS485 TX indicator WS2812 RGB LEDcontrollable via GPIO38 USB Type-C connectorfor module power supply, firmware downloading and USB communication Passive buzzersound frequency is controllable via GPIO21 ESP32 RESET button ESP32 BOOT button External antenna connectorSMA female connector, for WiFi and Bluetooth wireless communication RS485 matching resistor jumperOnboard reserved 120R matching resistor, enabled via jumper Relays default control pin setting Enclosure Design ABS Protection Enclosure With Rail-Mount Support, Easy To Install, Safe To Use Size Certificates and Compliance Documents Available certification and compliance documents for this product can be reviewed as PDF files below. CBT240925022EC ESP32-S3-Relay-6CH-EMC Document
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