Gravity: Digital 5A Relay Module for Arduino

SKU:DFR0017 Brand:DFRobot Reward Points: 26
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Topic: Gravity
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The DFRobot Relay Module is a standard relay designed to establish a connection between external circuits or modules and controller boards. It finds common applications alongside Arduino in areas such as home lighting, high-power appliances, and various other devices. Its modular design allows for seamless integration with controller boards, ensuring ease of use. This relay module integrates a status LED, enabling visual indication of its activation or deactivation state. It can be controlled through the digital IO port with a simple HIGH or LOW on Arduino compatible boards. Other boards will require the same voltage level. This module is also suitable for controlling electromagnetic valves, lighting fixtures, motors, and other high-current or high-voltage equipment.

Gravity Digital 5A Relay Module Schematic diagram

If you intend to use this relay coil with 3.3V controllers such as ESP32 and Raspberry Pi Pico, you can consider exploring this relay that supports 3.3V operation.

Relays are typically employed for low-frequency switching applications, such as controlling the on/off operation of solenoid valves or lighting fixtures. However, if you want to adjust the brightness of a light or regulate the speed of a water pump using PWM, I recommend using the Gravity: MOSFET Power Controller. This MOSFET controller does not support AC voltage and cannot isolate high voltages exceeding 30V. Nevertheless, it allows for the smooth power control of loads within the voltage range using a PWM signal with a frequency of 1kHz.


  • 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


Project 1. Using the Arduino Xboard to control a relay
Introduction: In this project you will find how to use the XBoard with xbee along with another arduino to control some objects over your local network.

Project 2. How to Make An Automatic Water Changing System

Introduction: This simple system detects water quality through simulation Gravity: Analog pH Sensor / Meter Kit For Arduino and Gravity: Analog Turbidity Sensor For Arduino, and supplies and drains water through the submerged pump and solenoid valve.

Project 3. How to Make an Automatic Christmas Tree

Introduction: With all the lights and decorations that people use at Christmas, power is left on all the time and electricity bills skyrocket. I made this motion detecting Christmas tree light setup that only turns on when people are nearby.

Project 4. Application Tutorials of FireBeetle Board - ESP32 BLE: Smarten a Plugboard

Introduction: What you have seen is a smart plugboard that converted by ESP32 master board and controlled by BLE of ESP32.


Shipping List

  • Gravity Relay Module V3.1 x1
  • Digital  Cable  x1


  • ESP32 Socket Server: Controlling a relay remotely
    2018-06-11 23:06:34




Gravity: Digital 5A Relay Module for Arduino

In Stock
  • 5-9$2.40
  • 10+$2.20