Waveshare ESP32S3 8CH WiFi Relay Module w/ CAN, DualCore, Isolation is a versatile industrial-grade control board designed for IoT, automation, and smart home applications. Built on the powerful ESP32S3 dual-core processor, it supports Wi-Fi, Bluetooth LE, and reliable Ethernet connectivity via the onboard W5500 chip. The module integrates 8 optically isolated digital inputs and 8 high-quality relay outputs (10A), enabling direct control of industrial devices and appliances. With its wide voltage input, isolation design, and optional PoE support, this board offers stable performance and flexible deployment in demanding environments.

Features

• Based on ESP32S3 microcontroller with Xtensa 32-bit LX7 dual-core processor, 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; relay supports digital input linkage control
• Onboard isolated CAN interface for connecting to various CAN devices
• Pin header for expansion and connection to other devices
• USB Type-C port for power supply, firmware downloading, and debugging
• Wide voltage input (7~36V) via screw terminal, suitable for industrial applications
• RTC chip onboard for scheduled tasks
• W5500 Ethernet chip for extending 10/100Mbps network port through SPI interface
• Optional PoE version with built-in module, compliant with IEEE 802.3af standard
• Optocoupler isolation to prevent interference from external high-voltage circuits
• Digital isolation to protect against external signal interference
• Unibody power supply isolation, providing stable isolated voltage without extra supply
• TF card slot for external storage of images and files
• Built-in buzzer, RGB LED, and indicators for power and CAN TX/RX status monitoring
• Rail-mounted ABS case for easy installation and safe operation

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)

Part List

ESP32-S3-ETH-8DI-8RO-C

• ESP32-S3-ETH-8DI-8RO-C 1
• 2.4G 4DB SMA antenna 1
• Screwdriver 1

ESP32-S3-POE-ETH-8DI-8RO-C

• ESP32-S3-POE-ETH-8DI-8RO-C 1
• 2.4G 4DB SMA antenna 1
• Screwdriver 1

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 CAN 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

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

Note: the PoE function is only available on ESP32-S3-POE-ETH-8DI-8RO-C version, and the switch shown in the picture is NOT included.

Application scenarios

Application Examples

Provides Multiple Networking Demos With Waveshare.Cloud, Using The Lightweight
MQTT Protocol To Achieve Data Visualization Service

Support Batch Customization

Support software and hardware customization
Including hardware interface, LOGO, label, case and web page, etc.

What’s On Board

1. 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
2. 8-channel quality relays
   contact rating per channel: 10A 250V AC or 10A 30V DC
3. Optocoupler isolation
   prevents interference from external high-voltage circuit connected to the relay
4. RESET button
5. PoE header
   supports connecting to PoE module for PoE capability (for PoE port version only)
6. BOOT button
7. Power IC
8. Digital isolation
   prevents interference from external signal
9. Power supply isolation
   provides stable isolated voltage, needs no extra power supply for the isolated terminal
10. Bi-directional optocoupler isolation
11. RTC battery holder
    1220 size (12mm diameter*2mm thickness), supports only rechargeable 3V~3.3V Batt.
12. Buzzer
13. Digital input screw terminals

1. Pin header
   for connecting other devices
2. LED indicators
   PWR: power indicator
   RXD: CAN RX indicator
   TXD: CAN TX indicator
3. USB Type-C connector
   for module power supply, firmware downloading and USB communication
4. WS2812 RGB LED
   controllable via GPIO38
5. Ethernet port
6. External antenna connector
   SMA female connector, for WiFi and Bluetooth wireless communication
7. Power supply screw terminal
   supports DC 7~36V wide voltage input
8. CAN comm interface
   for connecting to external CAN devices
9. CAN matching resistor jumper
   onboard reserved 120R matching resistor, enabled via jumper
10. Relay screw terminals

1. Onboard TVS (Transient Voltage Suppressor)
   can effectively suppress surge voltage and transient spike voltage in the circuit
2. CAN conversion chip
3. MP1605GTF-Z
   DC-DC power module
4. PCF85063ATL
   RTC chip, can achieve some scheduled tasks

1. TCA9554PWR
   GPIO expansion chip
2. W5500
   for extending 10/100Mbps network port through SPI interface
3. 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