The Waveshare 8-Channel ESP32-S3 Wi-Fi Relay Module is based on an ESP32S3 microcontroller with an Xtensa 32bit LX7 dualcore processor running up to 240MHz, featuring 2.4GHz WiFi and Bluetooth LE dualmode wireless, and adds a W5500 Ethernet chip over SPI for a 10/100Mbps network port (with the option for PoE support).

I/O is set up for realworld control: highquality relays (10A at 250VAC / 30VDC), passive and active digital inputs with bidirectional optocoupler isolation, and linkage so relays can follow digital inputs.

Optocouplers prevent interference from external highvoltage circuits on the relay side, with digital isolation to keep external signals clean, and a unibody isolated power supply that provides a stable isolated voltage so the isolated terminal needs no extra supply.

An onboard isolated CAN interface connects to a range of CAN devices, and a pin header gives access to other peripherals. Power it via the USBC port (also used for firmware downloading and debugging) or the screw terminal with a wide 736V input.

Anonboard RTC supports scheduled tasks (with a CR1220 battery holder for rechargeable coin cells only), theres aMicroSD card slot for storing images and files, and you get a builtin buzzer, RGB LED, plus power and CAN TX/RX indicators to monitor device status. Its all housed in a railmounted ABS case thats easy to install and safe to use.

There are two versions of this product available – one with a standard/common Ethernet port, and one with a PoE network port (via a builtin IEEE 802.3afcompliant module), please select an option before adding to your cart.

What’s Onboard?

1. ESP32-S3-WROOM-1U-N16R8
   • ESP32S3 series with Xtensa 32bit LX7 dualcore processor, 16MB Flash and 8MB PSRAM.
2. 8channel relays
   • Contact rating per channel: 10A at 250V AC or 30V DC.
3. Optocoupler isolation
   • Prevents interference from external highvoltage circuits connected to the relay.
4. Reset button
5. PoE header
   • Connects to a PoE module to add PoE capability (PoEport version only).
6. Boot button
7. Power IC
8. Digital isolation
   • Prevents interference from external signals.
9. Powersupply isolation
   • Provides a stable isolated voltage; no extra power supply needed for the isolated terminal.
10. Bidirectional optocoupler isolation
11. RTC battery holder
    • CR1220 size, supports only rechargeable 3.03.3 V batteries.
12. Buzzer
13. Digital input screw terminals
14. Pin header
    • For connecting other devices.
15. LED indicators
    • PWR: power indicator.
    • RXD: CAN RX indicator.
    • TXD: CAN TX indicator.
16. USB TypeC connector
    • Power supply, firmware download and USB communication.
17. WS2812 RGB LED
    • Controllable via GPIO38.
18. Ethernet port
19. External antenna connector
    • SMA female for WiFi and Bluetooth.
20. Powersupply screw terminal
    • DC 736V widerange input.
21. CAN interface
    • Connects to external CAN devices.
22. CAN matching resistor jumper
    • Onboard 120 matching resistor; enable via jumper.
23. Relay screw terminals

1. Onboard TVS (Transient Voltage Suppressor)
   • Suppresses surge voltage and transient spikes in the circuit.
2. CAN conversion chip
3. MP1605GTFZ
   • DCDC power module.
4. PCF85063ATL
   • RTC chip; supports scheduled tasks.
5. TCA9554PWR
   • GPIO expansion chip.
6. W5500
   • Adds a 10/100Mbps network port via SPI.
7. MicroSD card slot
   • Supports external MicroSD card storage for images and files.

Features

• ESP32S3 MCU (Xtensa 32bit LX7 dualcore, up to 240MHz)
  • 2.4GHz WiFi + Bluetooth LE (dualmode), superior RF performance
• Highquality relay, contact rating 10A @ 250VAC / 30VDC
• Passive/active digital inputs with bidirectional optocoupler isolation; relay supports digitalinput linkage
• Isolated CAN interface for connecting to CAN devices
• Pin header for access to additional devices
• USBC for power, firmware download and debugging
• 736V screwterminal power input
• RTC for scheduled tasks
• W5500 Ethernet over SPI for 10/100Mbps network port
• Optocoupler isolation against interference from external highvoltage circuits on the relay side
• Digital isolation to prevent external signal interference
• Unibody powersupply isolation provides stable isolated voltage; no extra supply needed at the isolated terminal
• MicroSD card slot for image/file storage
• Builtin buzzer, RGB LED, power and CAN TX/RX indicators for status monitoring
• Railmounted ABS case for easy, safe installation
• Optional PoE version with builtin IEEE 802.3afcompliant module

Specifications

Resources

• Product Wiki

Package Contents

• 1x 8-Channel ESP32-S3 Wi-Fi Relay Module with CAN Interface (select version before adding to cart)
• 1x 2.4G 4DB SMA antenna
• 1x Screwdriver