SparkFun Qwiic Quad Relay
The SparkFun Qwiic Quad Relay lets you switch four high-power devices from an Arduino or other low-power microcontroller over I²C. Each of the four relays is rated for up to 5 A at 250 VAC or 30 VDC, with individually colour-coded LEDs and screw terminals for easy identification and connection.
An onboard ATtiny84 handles I²C commands for toggling the relays. The I²C address is software-configurable, allowing you to daisy-chain over 100 boards. Power the board via the barrel jack (7–15 V, or 5 V with the underside jumper), and use the Qwiic connectors or broken-out I²C header for communication — no soldering required.
Key Features
- 4× Independent Relays – Each rated 5 A @ 250 VAC / 30 VDC
- I²C Control – ATtiny84 with configurable address for daisy-chaining
- Qwiic Compatible – Solderless plug-and-play connection
- Colour-Coded LEDs – Visual status for each relay channel
- Screw Terminals – Secure high-power connections
- Barrel Jack Power – 7–15 V (or 5 V via underside jumper)
Specifications
- Relay Rating: 5 A per channel @ 250 VAC / 30 VDC
- Channels: 4
- Controller: ATtiny84 (I²C)
- Power Input: 7–15 V barrel jack (5 V with jumper)
- Connector: Qwiic (JST-SH 1 mm, 4-pin) + I²C header
Warning: This board switches high-voltage mains power. It includes safety features (wide traces, ground isolation, milled clearances) but is intended for users experienced with high-voltage AC wiring. Always follow local electrical safety regulations.
Resources
The SparkFun Qwiic Quad Relay appears in the following collections:
SKU SF-COM-16566
by SparkFun
