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Relay Control PCB
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A bare PCB for building a relay control circuit, based on SparkFun's Controllable Power Outlet tutorial. It allows you to switch high-voltage loads using a s...
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A bare PCB for building a relay control circuit, based on SparkFun's Controllable Power Outlet tutorial. It allows you to switch high-voltage loads using a simple 0–5V GPIO signal from any microcontroller. Components must be sourced and soldered separately.
Key Features
- Bare PCB – Solder your own components for a custom relay controller
- GPIO Controlled – Switch with a 0–5V signal from any microcontroller
- High-Voltage Switching – Control mains-powered devices safely
Warning: This project involves high-voltage mains wiring. Only attempt this if you are experienced with mains electrical work and understand the safety risks involved.
Ideal For
- Microcontroller-switched power outlets
- Home automation relay circuits
- Learning relay control electronics
Package Contents
- 1× Relay control PCB (bare board, components not included)
Jargon buster
Plain-language definitions for the technical terms used above.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
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