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This advanced industrial-grade relay module is built on the powerful ESP32-S3 platform, featuring a high-performance Xtensa® 32-bit LX7 dual-core processor running at up to 240MHz. It supports both WiFi and Bluetooth connectivity, making it ideal for IoT and automation applications.
Key features include:
8-Channel Relay Outputs – Reliable switching for industrial devices.
Integrated RS485 Interface – Fully isolated for safe and robust serial communication.
Onboard Ethernet Port – Wired network support for stable connectivity.
Digital Input Terminals – Flexible input options for monitoring and control.
Multiple Isolation Protections – Includes power isolation and optocoupler isolation to enhance safety, stability, and reliability.
Designed for demanding environments, this module offers a secure and flexible platform for industrial automation, smart control systems, and remote monitoring solutions.
Version options
ESP32-S3-ETH-8DI-8RO
Common network port + isolated RS485
8-ch digital inputs + 8-ch relays
ESP32-S3-POE-ETH-8DI-8RO
PoE network port + isolated RS485
8-ch digital inputs + 8-ch relays
Features
- Based on ESP32-S3 microcontroller with Xtensa 32-bit LX7 dual-core processor, capable of running at 240 MHz
- Integrated 2.4GHz Wi-Fi and Bluetooth LE dual-mode wireless communication, with superior RF performance
- High quality relay, contact rating: ≤10A 250V AC / 30V DC
- Supports passive and active digital input, with bi-directional optocoupler isolation. The relay supports digital input linkage control
- Onboard isolated RS485 interface, for connecting to various RS485 Modbus industrial modules or sensors
- Onboard pin header, allowing access to other devices
- Onboard USB Type-C port for power supply, firmware downloading and debugging
- Onboard power supply screw terminal, supports 7~36V wide voltage input, suitable for industrial applications
- Onboard RTC chip, supports scheduled tasks
- Onboard W5500 Ethernet chip for extending 10/100Mbps network port through SPI interface
- Optional for PoE network port version, with built-in PoE module for PoE capability (compliant with IEEE 802.3af standard)
- Onboard optocoupler isolation to prevent interference from external high-voltage circuit connected to the relay
- Onboard digital isolation to prevent interference from external signal
- Onboard unibody power supply isolation, providing stable isolated voltage, no extra power supply required for the isolated terminal
- Onboard TF card slot for external TF card storage of images and files
- Built-in buzzer, RGB LED, power supply and RS485 TX/RX indicators for monitoring the operating status of the devices
- Rail-mounted ABS case, easy to install, safe to use
Specifications
| Version | ESP32-S3-POE-ETH-8DI-8RO | ESP32-S3-POE-ETH-8DI-8RO-C | |
|---|---|---|---|
| Microcontroller | ESP32-S3 (Default module: ESP32-S3-WROOM-1U-N16R8, 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 comm interface | Interface | RS485 | CAN |
| 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 | ||
| Ethernet interface | PoE Ethernet port, supports IEEE 802.3af standard (for PoE port version only) | ||
| Digital input | Input channels | 8 | |
| Input voltage | 5V~36V | ||
| Input type | Passive input / active input (NPN or PNP type) | ||
| Isolation type | Bi-directional optocoupler isolation | ||
| Relay | Contact rating | ≤10A 250V AC / 30V DC | |
| Relay channels | 8 | ||
| Contact form | 1NO 1NC | ||
| Isolation | Optocoupler isolation | ||
| LED indicators | RGB | RGB colorful LED, supports programmable control of 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/CAN 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 | 175 × 90 × 40 (mm) | ||
Based on ESP32-S3, Designed
for AIoT market
Equipped with Xtensa 32-bit LX7 dual-core processor, capable of running at 240 MHz, with Powerful AI Computing Performance and Security Encryption Mechanism; Integrated 2.4GHz Wi-Fi and Bluetooth LE dual-mode wireless communication
Onboard multiple isolation protection circuits
Multiple protections, more safe and reliable
supports RS485 and Bluetooth / WIFi remote control
Onboard 8-ch relays and 8-ch digital inputs
Contact rating of the onboard relay up to 10A 250V AC / 30V DC
Directly controlling 220VAC home appliances, or devices below 30V DC
Digital input
Supports passive (dry contact) and active (wet contact) digital input, with bi-directional optocoupler isolation
Application scenarios
Supports Arduino IDE
Comprehensive SDK, Dev Resources, And Tutorials To Help You Easily Get Started
Optional for PoE function
built-in PoE module, providing both network connection and power supply in one cable
* the PoE function is only available on ESP32-S3-POE-ETH-8DI-8RO version, and the switch shown in the picture is NOT included.
Application Examples
Provides Multiple Networking Demos With Waveshare.Cloud, Using The Lightweight
MQTT Protocol To Achieve Data Visualization Service
What's On Board
- ESP32-S3-WROOM-1U-N16R8
Adopts ESP32-S3 series chip with Xtensa 32-bit LX7 dual-core processor, built in 16MB Flash and 8MB PSRAM - 8-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 - RESET button
- PoE header
supports connecting to PoE module for PoE capability (for PoE port version only) - BOOT button
- Power IC
- Digital isolation
prevents interference from external signal - Power supply isolation
provides stable isolated voltage, needs no extra power supply for the isolated terminal - Bi-directional optocoupler isolation
- RTC battery holder
- Buzzer
- Digital input screw terminals
- Pin header
for connecting other devices - LED indicators
PWR: power indicator
RXD: RS485 RX indicator
TXD: RS485 TX indicator - USB Type-C connector
for module power supply, firmware downloading and USB communication - WS2812 RGB LED
controllable via GPIO38 - Ethernet port
- External antenna connector
SMA female connector, for WiFi and Bluetooth wireless communication - Power supply screw terminal
supports DC 7~36V wide voltage input - RS485 comm interface
for connecting to external RS485 devices - RS485 matching resistor jumper
onboard reserved 120R matching resistor, enabled via jumper - Relay screw terminals
- Onboard TVS (Transient Voltage Suppressor)
can effectively suppress surge voltage and transient spike voltage in the circuit - RS485 conversion chip
- MP1605GTF-Z
DC-DC power module - PCF85063ATL
RTC chip, can achieve some scheduled tasks
- TCA9554PWR
GPIO expansion chip - W5500
for extending 10/100Mbps network port through SPI interface - TF card slot
supports external TF card storage for images and files
Enclosure Design
ABS Protection Enclosure With 35mm Rail-Mount Support, Easy To Install, Safe To Use
Outline dimensions
Common network port
PoE network port
Support Batch Customization
Support software and hardware customization
Including hardware interface, LOGO, label, case and web page, etc.
Resources & Services
Wiki: www.waveshare.com/wiki/ESP32-S3-ETH-8DI-8RO
Shipping list
Weight: 0.401 kg
ESP32-S3-POE-ETH-8DI-8RO
- ESP32-S3-POE-ETH-8DI-8RO × 1
- 2.4G 4DB SMA antenna × 1
- Screwdriver × 1
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