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Qwiic Relay

This board has gone red! We've got a few of the original SparkX versions left. Same device and firmware, the red version works the same but has much better documentation.

Have you ever wanted to control something powerful? Have you ever needed to turn on/off a high power device from your Arduino? Now you can with the Qwiic Relay! This device allows you to control large power loads with simple I2C commands. The Qwiic Relay is perfect for large inductive loads like DC motors.

The Qwiic Relay comes with a default I2C address of 0x18 but can be changed with a simple command allowing you to control over 100 Qwiic Relays on a single bus!1 In addition, there is an address jumper on the back of the board. Closing this jumper with solder will change the address to 0x19.

The Qwiic Relay comes fully assembled and uses the simple Qwiic interface. No soldering, no voltage translation, no figuring out which pin is SDA or SCL, just plug and go!

This newest version of the Qwiic Relay includes many additional safety features. The ground isolation between the load and the low voltage control has been increased and an air-gap has been added around the common pin. The traces between the relay and the NC/NO/COM terminals have been doubled to increase the maximum current to 5.5 amps at 240 VAC.

Note: Not comfortable playing with high voltage AC? That's understandable. Please consider using the IoT Power Relay. It's not I2C but the IoT Power Relay contains shielding to prevent accidental shock.

Footnote 1: Toggling lots of relays on a 3.3V bus can cause voltage spikes. An external power supply will be required.

We do not plan to regularly produce SparkX products so get them while they’re hot!

Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.

Qwiic Relay Product Help and Resources

Qwiic Single Relay Hookup Guide

January 3, 2019

Get started switching those higher power loads around with the Qwiic Single Relay.


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #24259 / about 5 years ago / 2

    Are there going to be guides to using the Qwiic devices on a Raspberry Pi, without using an Arduino?

    • Patronics / about 5 years ago / 2

      Although not a guide, it’s relatively easy to decipher the code provided for the arduino, I easily translated that for use with a PICAXE, which works great. If you find a tutorial for any other i2c hardware with a raspberry pi, it’s largely the same process for this. The only information you really need is that this device defaults to the address 0x30 (or 0x18 in a 7 bit addressing variant as used on arduino), and that you send a 1 to it to turn it on, and a 0 to turn it off. Couldn’t be simpler!

  • Patronics / about 5 years ago / 1

    Anyone know of a similar (still available) device, or when these may be available again? My college robotics club has a design that needs several, yet I only bought 2 before they went out of stock.

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