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SparkFun Qwiic Quad Solid State Relay Kit

The SparkFun Qwiic Quad Solid State Relay Kit takes one of our favorite solid state relays and lets you place up to four of them on a single PCB to control all of them via I2C from your desired microcontroller. Each relay is rated to 40A @ 28-380 VAC so with all four on board you can control some serious power all from the easy-to-use Qwiic Connect System. The kit requires no soldering but there is some minor assembly required to attach the relays to the board and to connect your AC load.

The ATTiny84 on the board comes pre-programmed to accept various commands to toggle all four relays. The I2C address of the ATTiny84 is software configurable so so if you had the desire and power, you could daisy chain over 100 Qwiic Quad Relays (but please be aware that toggling lots of relays on a 3.3V bus can cause voltage spikes so an external power supply will be required)! In addition, the address jumper can be opened to switch the I2C address from 0x08 (Default) to 0x09 (Alternate).

Messing with such high voltage is dangerous! This is a power accessory intended for users who are experienced around, and knowledgeable about, high AC voltage. If you're uncomfortable dealing with high AC voltage, that's okay! Check out the IoT Power Relay instead. The IoT Power Relay is fully enclosed, making it a lot safer. Also, for small loads (eg. 4-10A), air cooling should be sufficient but if you are sourcing more than that, a heat sink is highly recommended. Refer to the relay datasheet for recommended heat sink dimensions.

Note: The black standoffs and 4-40 screws used to secure them shown in some of the photos are NOT included with the kit. Check out the Hookup Accessories below if you would like to include some in your order.


The SparkFun Qwiic connect system is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.


  • 1x Qwiic Quad Solid State PCB
  • 4x Solid State Relay - 40A (3-32V DC Input)
  • 8x 4-40 Hex Nut
  • 8x 3/8in. Phillips Machine Screw - 4-40 Thread
  • Hook-up Wire 8" - 22 AWG (Red)
  • Hook-up Wire 8" - 22 AWG (Black)
  • Operating Voltage: 2.5-3.6V (3.3V recommended)
  • I2C Address: 0x08 (Default), 0x09 (Alternate via jumper)
  • Max Current (Through Relay): 40A (24-380VAC)
  • Zero Cross Trigger
  • Normally Open Circuit Only

SparkFun Qwiic Quad Solid State Relay Kit Product Help and Resources

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SparkFun Qwiic Quad Solid State Relay Kit Hookup Guide

July 16, 2020

A Hookup Guide to get you started with the SparkFun Qwiic Quad Solid State Relay Kit (say that five times fast!).

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.

3 DIY

Skill Level: Competent - You might need to break out the power tools. Nothing beyond a power drill or rotary tool should be required, but you might have a hard time with just a screwdriver and hammer. Cutting holes into plastic or metal might be required.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

2 Programming

Skill Level: Rookie - You will need a better fundamental understand of what code is, and how it works. You will be using beginner-level software and development tools like Arduino. You will be dealing directly with code, but numerous examples and libraries are available. Sensors or shields will communicate with serial or TTL.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

4 Electrical Prototyping

Skill Level: Experienced - You will need to consult a datasheet for calculations to determine a components output format, linearity, and do a little math to get what you need. You will be using a datasheet or schematic beyond basic pinouts.
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Comments

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.

  • The typical drop for these relays is 1.6V, so each relay dissipates 64W with a 40A load. Be aware that that will call for a BIG heatsink for each relay, which is rated 80C maximum. Run more than an amp or so without a heatsink and expect the relay to fail prematurely.

  • You should tell people up front that these zero crossover relays will not work well for highly inductive loads like some power supplies and motors.

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