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
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High‑Performance MCU — ESP32‑S3, Xtensa® 32‑bit LX7 dual‑core @ 240 MHz with AI computing capabilities and encryption.
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Wireless & Wired Connectivity — Integrated 2.4 GHz Wi‑Fi + Bluetooth 5 LE; onboard isolated RS485 port.
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6 Quality Relays — Contact rating ≤ 10 A 250 VAC / 30 V DC; direct control of high‑voltage appliances or DC loads.
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Industrial‑Grade Isolation — Power isolation, optocoupler isolation, and digital signal isolation for enhanced safety.
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Pico HAT Expansion — 40‑pin header compatible with Raspberry Pi Pico HATs (add RTC, CAN, RS232, LoRa, sensors, etc.).
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Robust Protection — TVS diodes, surge suppression, ESD protection, and onboard matching resistor (enable via jumper).
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User Indicators — RGB LED, power indicator, RS485 TX/RX LEDs, and onboard buzzer for status feedback.
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Flexible Power Input — USB‑C or 7–36 V DC via screw terminal; onboard isolated power output for RS485 devices.
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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/30VDC
Directly 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
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Industrial equipment control and monitoring
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Home and building automation
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Remote IoT relay switching via Wi‑Fi / Bluetooth / RS485
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Sensor‑triggered relay control with full electrical isolation
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Integration with Arduino, MicroPython, ESPHome, Home Assistant, and custom firmware
Support Batch Customization
Support software and hardware customization
Including hardware interface, LOGO, label, case and web page, etc.
What's On Board
- ESP32-S3
up to 240MHz operating frequency, with 2.4GHz WiFi and BLE - 6-channel quality relays
contact rating per channel: ≤10A 250V AC or ≤10A 30V DC - Optocoupler isolation
prevents interference from external high-voltage circuit connected to the relay - Digital isolation
prevents interference from external signal - Power supply isolation
provides stable isolated voltage, needs no extra power supply for the isolated terminal - TVS diode
effectively suppresses surge voltage and transient spike voltage in the circuit - Ceramic gas discharge tube
- Relay screw terminals
for connecting with user devices - 40PIN Raspberry Pi Pico HAT header
- RS485 bus interface
for connecting to external RS485 devices
- Power supply screw terminal
Supports DC 7~36V wide voltage input - LED indicators
PWR: power indicator
RXD: RS485 RX indicator
TXD: RS485 TX indicator - WS2812 RGB LED
controllable via GPIO38 - USB Type-C connector
for module power supply, firmware downloading and USB communication - Passive buzzer
sound frequency is controllable via GPIO21 - ESP32 RESET button
- ESP32 BOOT button
- External antenna connector
SMA female connector, for WiFi and Bluetooth wireless communication - RS485 matching resistor jumper
Onboard 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