8 Channel Ethernet Wifi CAN Relay

BlackPaw Notes

This is our go to relay for our Control Systems, 8 channels, hard wired, digital inputs and a CAN bus. Digital inputs allow use of the relay channels by hard switches if Home Assistant is down and CAN bus offers support to batteries or other devices.

Manufacturer Notes

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

I/O is set up for real‑world control: high‑quality relays (≤10 A at 250V AC / 30V DC), passive and active digital inputs with bi‑directional optocoupler isolation, and linkage so relays can follow digital inputs.

Optocouplers prevent interference from external high‑voltage 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 USB‑C port (also used for firmware downloading and debugging) or the screw terminal with a wide 7–36 V input.

An onboard RTC supports scheduled tasks (with a CR1220 battery holder for rechargeable coin cells only), there’s a MicroSD card slot for storing images and files, and you get a built‑in buzzer, RGB LED, plus power and CAN TX/RX indicators to monitor device status. It’s all housed in a rail‑mounted ABS case that’s easy to install and safe to use.

There are two versions of this product available - this is the common ethernet variant, this variant does NOT have PoE capability.