DFRobot
4 Channel Arduino Relay Shield
This 4-channel relay shield from DFRobot plugs directly onto an Arduino Uno or compatible board, providing opto-isolated relay switching for controlling high...
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This 4-channel relay shield from DFRobot plugs directly onto an Arduino Uno or compatible board, providing opto-isolated relay switching for controlling high-power devices such as lamps, water pumps, and motors. Each relay has its own test button and LED status indicator.
The shield features a built-in XBee socket for wireless remote control via XBee, Bluetooth, or WPM modules. The relay control pins are selectable (default: digital 2, 7, 8, 10), and an external 9V power supply is required to drive the relays and XBee module.
Key Features
- 4 Relay Channels – Opto-isolated for safe microcontroller interfacing
- Arduino Uno Compatible – Plugs directly onto Rev3 boards
- XBee Socket – Built-in support for wireless remote control
- Test Buttons – Individual test button for each relay
- LED Indicators – Status LEDs show relay state
- Selectable Control Pins – Default digital 2, 7, 8, 10
Specifications
- Contact Rating – 3A @ 120V AC / 24V DC
- Max Switching Voltage – 240V AC / 60V DC (below 38V recommended)
- Max Switching Current – 5A
- Max Switching Power – 360VA AC / 90W DC
- Coil Voltage – 9V DC
- Electrical Life – Min 100,000 operations
- Mechanical Life – Min 10,000,000 operations
- I/O – 6 analogue + 13 digital channels
- Operating Temperature – −30°C to +85°C
- Operating Humidity – 40–85%
- Safety Standards – UL, cUL, TUV, CQC
- Dimensions – 95 × 65mm
Ideal For
- Home automation systems
- Robotics and motor control
- Wireless relay switching via XBee
- Arduino-based switching projects
Package Contents
- 1× Relay shield for Arduino V2.1
- 2× Nylon standoffs with screws
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- 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.
- Shield
- An add-on board that plugs into a main controller board to give it extra features such as sensing, motor control or communication. Knowing a product supports shields helps you judge whether it can connect neatly into an existing maker-board setup.
Find this product in
Brands
Supplier page — dfrobot.com
Supplier Description · 777.1 KB · Click any page to view full size
DFR0144 hjr4102 4 channel relay controlboard layout v2.1
Document · 286.2 KB · Click any page to view full size
DFR0144 hjr4102 4 channel relay controlboard schematics v2.1
Schematic · 25.4 KB · Click any page to view full size
DFR0144 hjr4102 4 channel relay controlboard datasheet v1
Datasheet · 198.4 KB · Click any page to view full size
Resources & Downloads
Guides, code examples, and more
Related Tutorials
Free guides on learn.littlebird.com.au
