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Green circuit board with two small fans, relay block, and colour-shifting LED

SMUGDESK

SMUGDESK Raspberry Pi Power Relay Expansion Module with Dual Cooling Fans & Auto Color Changing LED

SKU CH-Q52V-2BN7Y

Adds relay switching, dual cooling fans and a status LED to Raspberry Pi models from A+ to 4B for automation projects

  • Controls high-power devices via built-in relay circuit for smart automation projects
  • Dual cooling fans dissipate heat to keep Raspberry Pi stable during continuous operation
  • Auto color-changing LED shows working status instantly without extra testing tools
  • Compatible with Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+ and 4B models
  • Stackable pin-header design simplifies installation for home, greenhouse or robotics builds

Raspberry Pi Relay Expansion Board

This SMUGDESK expansion module adds a power relay, dual cooling fans and an auto colour-changing LED to Raspberry Pi single-board computers. It is designed for makers, students and hobbyists building smart-home, agricultural or robotic control projects that need to switch higher-power loads safely. The board stacks directly onto the GPIO header of supported Pi models.

Upgrade from bare GPIO switching

The module replaces ad-hoc transistor or MOSFET circuits that makers often wire on perf-board to drive relays, fans and status LEDs separately. The jump is worth it when a project demands reliable high-load switching, active cooling for continuous operation and instant visual feedback without extra wiring or code. Builders who only need simple low-voltage GPIO toggling will not benefit from the integrated relay and fan hardware.

Check pin header and load specs

Verify that your Raspberry Pi model matches the listed A+, 3A+, B+, 2B, 3B, 3B+ or 4B series and that the 40-pin header is accessible for stacking. Confirm the external device voltage and current stay within the relay contact ratings to avoid overload damage. Ensure the power supply can deliver enough current for the Pi, the dual fans and the controlled load simultaneously.

Highlights

  • Controls high-power devices via built-in relay circuit for smart automation projects
  • Dual cooling fans dissipate heat to keep Raspberry Pi stable during continuous operation
  • Auto color-changing LED shows working status instantly without extra testing tools
  • Compatible with Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+ and 4B models
  • Stackable pin-header design simplifies installation for home, greenhouse or robotics builds

Specifications

No published specifications for this item yet.

Questions about this item

Which Raspberry Pi models does the 40-pin GPIO header on this relay board align with?

The board stacks on Raspberry Pi A+, 3A+, B+, 2B, 3B, 3B+ and 4B using the standard 40-pin header layout.

What is the correct order for connecting high-load devices to the relay terminals to avoid overload damage?

Wire the load to the relay’s normally-open and common terminals first, then power the Pi, and finally trigger the relay via GPIO — never energise the load before the control signal is stable.

How are the dual cooling fans powered and when should they be cleaned?

The fans draw 5 V from the Pi’s GPIO header and run continuously; clean dust from the fan blades every three to six months with compressed air to maintain airflow.

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