SparkFun Qwiic Single Relay

The SparkFun Qwiic Single Relay is a powerful tool for controlling high-power devices from low-power microcontrollers, such as Arduino. This relay can handle up to 5.5A at 240VAC for extended durations, and it's controlled through simple I²C commands. Its Qwiic system and on-board screw terminals make it easy to connect, requiring no soldering.

The Qwiic Relay has a default I²C address of 0x18, which can be changed with a simple command. This allows for the control of over 100 Qwiic Relays on a single bus. However, toggling many relays on a 3.3V bus can cause voltage spikes, so an external power supply may be needed. The board also features an address jumper on the back, which can be closed with solder to change the address to 0x19.

SparkFun has incorporated numerous safety measures into the PCB. Ground isolation between the load and 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. For those uncomfortable with high voltage AC, consider using the IoT Power Relay, which contains shielding to prevent accidental shock and is great for learning how to use relay power accessories.

The I²C address of the Single Relay is 0x18 and is jumper selectable to 0x19 (software-configurable to any address). A multiplexer/Mux is required to communicate to multiple Single Relay sensors on a single bus. If you need to use more than one Single Relay sensor, consider using the Qwiic Mux Breakout.

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.

Features

• Operating Voltage: 1.7V-3.6V
• Coil Resistance: 23.5Ω
• I²C Address: 0x18 (Default), (Jumper changes to 0x19)
• Max Current (Through Relay): 5.5A (240 VAC)

Documents

• Schematic
• Eagle Files
• Hookup Guide
• Datasheet (G5LE)
• Qwiic Page
• Arduino Library
• Example Code
• Python Package
• GitHub
• Firmware