Qwiic Quad Relay Hookup Guide

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Contributors: Elias The Sparkiest
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Introduction

SparkFun's Qwiic Quad Relay is a product designed for switching not one but four high powered devices from your Arduino or other low powered microcontroller using I2C. It has four relays rated up to 5 Amps per channel at 250VAC or 30VDC that are controlled by an ATtiny84A. Each channel has its own blue stat LED, silk for easy identification, and screw terminals for easy connection. The product is Qwiic enabled allowing you to easily integrate the Quad Relay with other products in the Qwiic environment, which means no solder neccessary!

SparkFun Qwiic Quad Relay

SparkFun Qwiic Quad Relay

COM-15102
$29.95
Before we begin! There are a number of safety precautions included in the product, but that can not account for human inexperience and error. This product and the example below interacts with HIGH AC voltage and so is intended for people experienced around, and knowledgeable about HIGH AC voltage. If that's not quite your jam, then take a look at our IoT Power Relay! It's not I2C but the IoT Power Relay contains shielding to prevent accidental shock.

Required Materials

For the example under Hardware Assembly, I used the following materials to control a load (i.e. a lamp). You may not need everything though depending on what you have. Add it to your cart, read through the guide, and adjust the cart as necessary.

USB micro-B Cable - 6 Foot

USB micro-B Cable - 6 Foot

CAB-10215
$4.95
12
Tactile Button Assortment

Tactile Button Assortment

COM-10302
$5.85
6

SparkFun BlackBoard

SPX-14669
5 Retired
Wall Adapter Power Supply - 5V DC 2A (Barrel Jack)

Wall Adapter Power Supply - 5V DC 2A (Barrel Jack)

TOL-12889
$5.95
16
Qwiic Cable - 100mm

Qwiic Cable - 100mm

PRT-14427
$1.50
Jumper Wires - Connected 6" (M/M, 20 pack)

Jumper Wires - Connected 6" (M/M, 20 pack)

PRT-12795
$1.95
2
Breadboard - Mini Modular (Red)

Breadboard - Mini Modular (Red)

PRT-12044
$3.95

Additional Options

You could also use our 9 volt wall adapter if that suits your fancy and we have a number of Qwiic cable sizes to fit your needs.

Wall Adapter Power Supply - 9VDC 650mA

Wall Adapter Power Supply - 9VDC 650mA

TOL-00298
$5.95
9
Qwiic Cable - 100mm

Qwiic Cable - 100mm

PRT-14427
$1.50
Qwiic Cable - 500mm

Qwiic Cable - 500mm

PRT-14429
$1.95
Qwiic Cable - 200mm

Qwiic Cable - 200mm

PRT-14428
$1.50
Qwiic Cable - 50mm

Qwiic Cable - 50mm

PRT-14426
$0.95

Tools

You will need a flush cutter and wire stripper to remove the sheath and insulation from a cable. A Phillips head screwdriver will be required to connect the load's to a screw terminal.

Self-Adjusting Wire Strippers

Self-Adjusting Wire Strippers

TOL-14872
$16.95
Flush Cutters - Xcelite

Flush Cutters - Xcelite

TOL-14782
$7.95
1
SparkFun Mini Screwdriver

SparkFun Mini Screwdriver

TOL-09146
$0.95
3

Suggested Reading

If you aren't familiar with the Qwiic system, we recommend reading here for an overview.

Qwiic Connect System
Qwiic Connect System

We would also recommend taking a look at the following tutorials if you aren't familiar with them.

Serial Communication

Asynchronous serial communication concepts: packets, signal levels, baud rates, UARTs and more!

I2C

An introduction to I2C, one of the main embedded communications protocols in use today.