Waveshare Industrial 6-Channel ESP32-S3 WiFi Relay Module - Industrial

In this review of the Waveshare Industrial 6-Channel ESP32-S3 WiFi Relay Module the bottom line is clear: this board is aimed at engineers and integrators who need reliable networked relay control with industrial isolation. The reviewer found the combination of an ESP32-S3 core, onboard isolated RS485, wide voltage input and a rail-mounted ABS case makes this a practical choice for small industrial automation projects. Its strongest reason to buy is the mix of wireless connectivity plus hardened isolation features that remove the need for extra external supplies or isolation components.

Key Features

• ESP32-S3 performance: The Xtensa 32-bit LX7 dual-core processor running up to 240 MHz delivers ample headroom for custom control code and network stacks.
• Dual wireless modes: Integrated 2.4 GHz Wi-Fi and Bluetooth LE let the module be controlled over wireless networks or used as a BLE peripheral for local configuration.
• High-capacity relays: Six high quality relays with a 10A 250VAC/30VDC contact rating handle common industrial loads without external contactors for many applications.
• Onboard RS485: The isolated RS485 interface enables direct connection to Modbus devices and industrial sensors for reliable wired communication.
• Wide input and USB-C: A 7~36V screw terminal and USB Type-C port provide flexible power, firmware download and debugging options in the field.
• Expansion header: The onboard 40-pin header compatible with some Pico HATs allows adding RTC, CAN, RS232, LoRa or sensor boards for extended functionality.

Who It's For

This module is best for system integrators, automation technicians and advanced hobbyists who need a compact, mountable relay controller with both Wi-Fi and industrial wired communication via RS485. It fits scenarios like remote pump control, HVAC zone switching, gate operators and small factory I/O where isolation and a broad input voltage range matter.

Those who should look elsewhere include users who require certified safety relays for life-safety circuits or those who need many more relay channels in a single unit; this product is focused on six relays with industrial-grade isolation rather than mass channel density or certified safety outputs.

Pros & Cons

Pros

• Strong on connectivity with Wi-Fi, Bluetooth LE and RS485 for mixed network architectures.
• Industrial readiness via wide 7~36V input, onboard unibody power isolation and optocoupler protection.
• Convenient form factor with rail-mounted ABS case and USB-C for easy deployment and debugging.
• Expandable through the 40-pin Pico-compatible header for additional comms or sensors.

Cons

• Not aimed at users who need certified safety-grade relay outputs; intended for general industrial control rather than safety-critical circuits.
• Documentation and community examples may be limited compared with more mainstream single-board products.

Specifications

Microcontroller	ESP32-S3 Xtensa 32-bit LX7 dual-core, up to 240 MHz
Relay rating	6 channels, 10A 250VAC / 30VDC
Communications	2.4 GHz Wi-Fi, Bluetooth LE, isolated RS485
Power input	USB Type-C and 7~36V screw terminal
Isolation	Optocoupler isolation, digital isolation and unibody power isolation
Expansion	Onboard 40-pin header compatible with some Raspberry Pi Pico HATs
Enclosure	Rail-mounted ABS case with status LEDs and buzzer

Our Verdict

The Waveshare Industrial 6-Channel ESP32-S3 WiFi Relay Module is a solid value for engineers who need a compact, networked relay controller with robust isolation and flexible powering. It combines wireless and RS485 connectivity, wide voltage input and an expandable header in a mountable package, making it a practical choice for many non-safety industrial control tasks.

Frequently Asked Questions

Does the board need an external isolated supply?
The module includes unibody power supply isolation so an extra isolated supply is not required for the isolated terminal in typical use.

Can it connect to Modbus sensors?
Yes, the onboard isolated RS485 interface is suitable for connecting to Modbus industrial modules and sensors.

How is firmware uploaded?
Firmware can be downloaded and debugged over the onboard USB Type-C port or via serial adapters on the expansion header when supported.