Keyestudio 4 channel 5V Relay Shield module for Arduino UNO R3

The Keyestudio 4 channel 5V Relay Shield module is an expansion board designed to plug directly into an Arduino UNO R3. It allows students, hobbyists, and makers to easily control high-current appliances and external devices using simple digital signals. This shield is perfect for home automation projects, interactive installations, and educational robotics kits.

Seamless Arduino UNO R3 integration

This shield is fully compatible with the UNO R3 control board, plugging directly on top of it. The four onboard relays are pre-wired to digital ports 4, 5, 6, and 7, allowing you to control them by simply setting these pins high or low in your code.

Visual status indicators

The board features four onboard red LEDs that act as output status indicators. When a relay is driven high and activated, its corresponding LED lights up to provide immediate visual feedback.

Convenient physical layout

Measuring 69mm by 54mm by 26mm and weighing 39.4g, this compact black PCB fits neatly over your microcontroller. It includes three M3 screw positioning holes to make mounting and installation straightforward.

High-current switching capacity

Each relay on the shield features a contact capacity of AC 120V at 3A or DC 24V at 3A. This enables your microcontroller projects to safely switch larger appliances and high-current external equipment.

Active high control logic

The 5V relay module operates on active HIGH logic, simplifying your code. A standard 5V DC power interface is provided to ensure the relays receive stable power during operation.