Waveshare Industrial 6-CH Relay Module for Raspberry Pi Zero

In this review of the Waveshare Industrial 6-CH Relay Module for Raspberry Pi Zero the bottom line is clear: this module is for makers and engineers who need reliable, isolated relay control over industrial buses. The reviewer found the board valuable where noise immunity and safe interfacing matter most, because it combines both power supply isolation and photocoupler isolation with high-quality 10A relays, plus RS485 and CAN options for field wiring. It is particularly useful when the project or installation must protect a Raspberry Pi Zero from high-voltage transients or long bus runs.

Key Features

• 6 isolated relay channels: Six independent relays provide reliable switching for loads rated up to 10A at 250V AC or 30V DC, suitable for many industrial control tasks.
• RS485 half-duplex communication: Onboard SP3485 and auto RX/TX switching enable UART control over long-distance, noise-prone serial links without extra transceiver wiring.
• CAN bus support via SPI: The MCP2515 + SN65HVD230 solution lets the module be controlled over a CAN half-duplex bus using SPI, useful in automotive or industrial networks.
• Unibody power isolation: The onboard isolated supply provides a stable isolated voltage for the relay terminals so external isolated power supplies are not required.
• Robust transient protection: TVS diodes, resettable fuses and protection diodes suppress spikes and protect the module and attached Pi from surges and electrostatic events.

Who It's For

The module is aimed at hobbyists with advanced projects, system integrators, and engineers who use a Raspberry Pi Zero or similar single-board computer and need safe, isolated relay outputs controlled over serial or CAN. It suits applications like remote I/O racks, small automation panels, vehicle prototypes or test benches where BUS communication and surge protection are essential.

Users who only need a simple, non-isolated relay board for low-voltage prototyping or who require more than six channels should look elsewhere; this board is optimized for isolation, fieldbus compatibility, and industrial-grade protection rather than minimal cost or massive channel counts.

Pros & Cons

Pros

• Industrial-grade isolation and photocouplers reduce interference and protect the Pi when switching higher voltages.
• Both RS485 (UART) and CAN (SPI) interfaces offer flexible fieldbus control options for many industrial setups.
• Onboard TVS, resettable fuses, and protection diodes increase resilience against surges and miswiring.
• High-quality relays with a 10A contact rating fit most AC and DC switching needs.

Cons

• The board is focused on isolation and protection, so it is bulkier and more specialized than simple hobby relay shields.
• Integration requires familiarity with RS485 or CAN and basic SPI/UART wiring to a Raspberry Pi Zero.

Specifications

Channels	6 relay channels
Relay contact rating	10A 250V AC or 10A 30V DC
RS485 interface	SP3485 half-duplex, UART control, auto RX/TX switch
CAN interface	MCP2515 + SN65HVD230 half-duplex, SPI control
Protection	Onboard TVS, resettable fuses, protection diodes
Isolation	Unibody power supply isolation and photocoupler isolation
Enclosure	ABS protection enclosure with rail-mount support

Our Verdict

The Waveshare Industrial 6-CH Relay Module is a practical, well-protected relay interface for Raspberry Pi Zero projects that require fieldbus control and strong isolation. It is good value for engineers who need surge protection, isolated power for relay terminals and the flexibility of RS485 or CAN control, but less appealing for users who need a minimal or low-cost non-isolated relay board.

Frequently Asked Questions

Does the module need an external isolated power supply?
The board includes a unibody isolated power supply that provides isolated voltage for the relay terminals, so an extra isolated supply is not required for the isolated side.

Can I control the relays from a Raspberry Pi Zero?
Yes; the module offers UART control over RS485 (via SP3485) and SPI control via the MCP2515 CAN interface, which can be connected to a Raspberry Pi Zero with appropriate wiring.

How does the board handle voltage spikes?
Onboard TVS diodes, resettable fuses and protection diodes help suppress surge and transient voltages and improve lightning and electrostatic resistance.