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Green Raspberry Pi relay HAT with two small fans and a multi-colour LED

SMUGDESK

SMUGDESK Raspberry Pi Relay Expansion Module with Dual Fans and Auto LED

SKU CH-AZYV-KN14W

Relay expansion board with dual fans and auto LED for Raspberry Pi A+ through 4B smart-home control

  • Dual fans keep Raspberry Pi cool during long runs
  • Auto colour LED shows relay status at a glance
  • Relay switches external loads for smart-home automation
  • Stacks on Pi A+, 3A+, B+, 2B, 3B, 3B+, 4B without wiring
  • Simple stacking design speeds up DIY and robot projects

Dual-fan Raspberry Pi relay HAT

This expansion board adds power relay switching to Raspberry Pi A+, B+, 2B, 3B, 3B+, 3A+, and 4B models. Two built-in cooling fans keep the Pi and the relay module at lower temperatures during extended operation. An auto colour-changing LED gives immediate visual feedback on relay status. The standard stacking header makes installation straightforward for smart-home, automation and DIY electronics projects.

Makers needing cooled relay switching

Hobbyists and engineers who want to control external loads from a Raspberry Pi while actively cooling the board will find this module a direct fit. It is not suited for applications that require more than the provided relay channels or for systems that cannot accommodate the stacked HAT form factor. Buyers needing isolated high-voltage interfaces or industrial-grade certifications should look at dedicated industrial I/O boards instead.

Stacking 40-pin GPIO header

The board connects through the Raspberry Pi’s standard 40-pin GPIO header in a stacking configuration. This single interface determines mechanical and electrical compatibility with the supported Pi models listed in the specifications.

Highlights

  • Dual fans keep Raspberry Pi cool during long runs
  • Auto colour LED shows relay status at a glance
  • Relay switches external loads for smart-home automation
  • Stacks on Pi A+, 3A+, B+, 2B, 3B, 3B+, 4B without wiring
  • Simple stacking design speeds up DIY and robot projects

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the SMUGDESK relay module on my Raspberry Pi 4B, and what is the common mistake to avoid?

Align the 40-pin GPIO header carefully and press straight down to stack the HAT; the step users often get wrong is forcing it at an angle, which bends pins and breaks contact.

What maintenance will the dual cooling fans need after months of continuous use?

Dust builds up on the fan blades and intake vents; clean them every few months with compressed air or a soft brush to keep airflow strong and temperatures low.

What is the first limit I will hit if I run a heavy load through the relays for hours?

The relay contact rating is the limiting factor; exceeding the specified load power causes overheating and permanent damage to the switching contacts.

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