SparkFun Qwiic Relay - 1x1A DPDT

The Qwiic DPDT Relay lets you switch two circuits via I2C or external input, with simple wiring and Qwiic connectors for easy integration.

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Easily control high-power devices directly from your microcontroller via I2C with the SparkFun Qwiic Relay. Built around the Omron G6K-2F-Y DC3 dual-pole/dual-throw (DPDT) relay, this board allows you to safely switch loads up to 1A at 30VDC or 0.3A at 125VAC (at 40°C). This relay is perfect if you're controlling heavy-duty motors or managing other high-power devices, bridging the gap between low-voltage logic and high-power applications.

Flexible Control Options
We designed this board to adapt to your specific project needs, offering multiple ways to trigger the relay:

• I2C Drive: Controlled via the on-board TCA9555 GPIO expander, requiring a remarkably low drive current of just 5.8mA at 3.3V.
• External Drive: This relay can also be triggered by an external input, such as a physical switch or a standard I/O signal (up to 50mA), giving you hardware-level control.
• Solderless Qwiic Integration: Two on-board Qwiic connectors let you add the relay to your I2C daisy chain without ever touching a soldering iron.

Transitioning from a Single Relay
If you are upgrading from our original Qwiic Single Relay, this DPDT version introduces a few key architectural differences that have been tailored for precision control:

• Dual-Circuit Control: While the original relay used a single-pole (SPDT) design, this DPDT board can switch two completely independent circuits simultaneously with a single command.
• Signal Optimized: The original relay was primarily built for heavy, high-voltage AC loads up to 5.5A at 240VAC. This new DPDT version is specifically engineered for lower-power signal-level switching up to 1A at 30VDC.
• Advanced Drive: Don't want to use I2C? This board allows external devices to drive the relay control directly.

Wiring your high-power components is as straightforward as it gets with the Qwiic Relay. We included a 3-pin screw terminal for a quick, completely solderless connection to the relay's primary pole (COM Pole). Meanwhile, the secondary pole (COM2 Pole) is broken out to standard 0.1-inch-spaced plated-through holes (PTH), giving you the flexibility to solder wires directly or use a breadboard for prototyping.

Features

• G6K-2F-Y DC3 DPDT Relay
  • Load Limits: 1A/30VDC and 0.3A/125VAC
  • I2C Drive Current: 5.8mA
  • External Drive Current: 50mA
• Relay Connections
  • COM Pole: 3-Pin Screw Terminal
  • COM2 Pole: 0.1"-spaced PTH
• TCA9555RTWR I2C GPIO Expander
  • I2C Address: 0x20 (Default), 0x21 (Alternate)
• 2x Qwiic Connectors
• LEDs
  • Red power (PWR) LED
  • Green status (STAT) LED
  • Green relay activity (ACT) LED

Resources

• Schematic
• KiCad Files
• Board Dimensions
• Datasheets:
  • G6K-2F-Y DC3 DPDT Relay
  • TCA9555 GPIO Expander
• Hookup Guide
• SparkFun I2C Expander Arduino Library
• GitHub Repository