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Angled shot of digital relay module for Arduino with screw terminals and optocoupler-DFRobot product sku:DFR0017 image.
Front of PCB Power Supply Circuit with 5V 1A label and Arduino Relay Module.
Overhead shot of 5A Arduino relay module with 4-pin header and circuit board
Back of digital relay module for Arduino with screw terminals and optocoupler-DFRobot product sku:DFR0017 image.
Detail of digital relay module for Arduino with screw terminals and optocoupler-DFRobot product sku:DFR0017 image.

Gravity: Digital 5A Relay Module for Arduino

$2.60
SKU: DFR0017
Volume Discount
  • $2.40 5+ items
  • $2.20 10+ items
A relay module for controlling high-power devices using digital IO, compatible with Arduino. Includes a status LED and works with 3.3V controllers.
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  • 3.3V
    3.3V
    $3.90
  • 5V
    5V
    $2.60
IntroductionApplicationsSpecificationShipping List Documents Resource Review

Introduction

Simple, Reliable Switching for High-Power Devices.The Gravity: Digital Relay Module provides safe and stable ON/OFF control for high-power AC and DC loads through a standard low-voltage digital signal. It is widely used in automation systems, Arduino-based projects, smart home devices, and industrial prototypes.

Designed for plug-and-play integration, the module eliminates the need for external driver circuits while offering clear status feedback through a built-in indicator LED.

Gravity: Digital 5A Relay Module for Arduino


Features of Gravity: Digital Relay Module

  • High-current switching capability up to 10A (NO) / 5A (NC)
  • Wide load support: up to 250VAC / 30VDC switching voltage
  • Direct digital control via standard TTL signal (3.3V/5V logic compatible in typical use cases)
  • Built-in status LED for real-time relay state indication
  • Opto-isolated design for improved electrical safety and signal separation
  • Gravity interface for fast hardware integration
  • Compact single-channel design suitable for embedded systems


    • Operating Principle

    The relay functions as an electrically controlled mechanical switch. A low-power digital signal activates an internal electromagnetic coil, which mechanically opens or closes the high-power circuit.

  • Digital HIGH → Relay ON (Load connected)
  • Digital LOW → Relay OFF (Load disconnected)

    • Switching is suitable for low-frequency control applications such as ON/OFF automation.


    Quick Start (Arduino Example)

    A standard Arduino setup enables relay toggling within minutes using a digital output pin.

    Wiring Overview

  • Relay VCC → 5V
  • Relay GND → GND
  • Relay Signal → Digital Pin (e.g., D3)

    • Behavior

    The relay switches ON and OFF every 2 seconds, demonstrating basic functional control and system responsiveness.

    Example Code


    Compatibility Notes

  • Compatible with most 5V microcontroller systems
  • For 3.3V systems (ESP32, Raspberry Pi Pico), a 3.3V-trigger compatible relay module is recommended
  • Not suitable for PWM-based power regulation or dimming applications
  • For speed control or brightness adjustment, a MOSFET power controller is recommended instead


    • Important Usage Guidance

  • Suitable for low-frequency ON/OFF switching only
  • Not designed for analog power control or high-frequency PWM operation
  • Ensure load specifications remain within rated limits for safe operation
  • Inductive loads (motors, solenoids) may require additional protection depending on application
  • What This Module Is Best For


    • This relay module is optimized for simple, reliable switching tasks where electrical isolation and safe high-voltage control are required. It serves as a fundamental building block in embedded control systems and automation projects.

    Applications

    • Smart home lighting control systems
    • Water pump and irrigation automation
    • Solenoid valve switching systems
    • Industrial relay control prototypes
    • Arduino / ESP32 / Raspberry Pi based automation projects
    • High-power device ON/OFF control modules

    Specification

  • Single relay board
  • Rated through-current: 10A (NO) 5A (NC)
  • Maximum switching voltage: 150VAC 24VDC
  • Interface: Digital
  • Control signal: TTL level (0~0.4V: OFF; 2.4~5V: ON)
  • Contact Rating (Res. Load): 10A 250VAC / 24VDC
  • Max. switching voltage 250VAC / 30VDC
  • Max. switching current 15A
  • Max. switching power 250VA 240W 
  • UL Rating: 10A 120VAC / 10A 250VAC
  • Operate time (at nomi. Vot.): 10ms
  • Release time (at nomi. Vot.): 5ms
  • High quality connector
  • Immersion gold surface

    • Shipping List

    • Gravity Relay Module V3.1 x1
    • Digital  Cable  x1
    • Acrylic Board x 1

    Documents

    Resource

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    Review

    Steffen.Lorenz Jan 22, 2025

    Easy to connect - does what it's supposed to - perfect for my DIY projects. Never had any problems with it so far.

    Tom.Kvichak Jul 13, 2022

    Great relay module for controlling devices through my Arduino projects, such as routing power, and supplying power greater than the 5vdc used with Arduino.

    Ohsoo. Aug 23, 2021

    Thanks for your best response..so good^^

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