5V 1CH Relay Module

The 5V 1CH Relay Module is a single-channel relay board with a built-in driver circuit that connects directly to an Arduino or any TTL-compatible microcontroller using just three wires — 5V, GND, and one digital signal pin — making it the most straightforward relay option for maker and STEM projects where the goal is switching a load from Arduino code without designing a separate relay driver circuit. This relay module differs from a bare 5V relay cube in that the driver transistor, flyback protection diode, and drive circuit are already assembled on the board.

The 1 channel relay module’s TTL logic control input is compatible with both 5V Arduino boards and 3.3V boards such as ESP8266 and ESP32, accepting control signals across the standard TTL voltage range — so the same relay 5 volt single channel module works across the most common microcontroller projects.

The 20mA maximum control signal current draw from the GPIO pin is within the safe output current limit of Arduino digital pins, protecting the microcontroller from overcurrent damage. This 5v single channel relay module is ideal for beginner Arduino GPIO relay switching and automation projects.

Related Product:

• Checkout 12V 2Ch Relay Module with Optocoupler

Features:

• Built-in driver — Arduino digital pin connects directly with no extra parts
• TTL logic input works with 5V Arduino and 3.3V ESP boards
• 3-wire connection: 5V, GND, signal — simplest relay wiring possible
• 20mA control current stays within safe Arduino GPIO output limit
• Single channel switches one independent load per relay module

Technical Specifications:

Applications:

• Arduino digital pin relay switching without external driver components
• Student controls LED strip via 1 channel relay module GPIO
• Project for relay 5 volt single channel basic switching demo
• 1 channel 5v relay module for microcontroller relay switching lab

Package Includes:

• 1 x 5V 1CH Relay Module