5V Relay Modules for Arduino, Raspberry Pi & DIY Projects

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5V Relay Module

5V Relay Modules can be operated by the Arduino Uno using the software provided with it. These switches are used in many applications, such as home automation and robotics. The relay module is an electrical switch can be used to add additional functionality to your project, and it doesn't require any soldering.

It has a single relay contact, which makes it easy to use. The relay switches has a built-in resistor and the resistance can be adjusted.

You can check the features and all details about 5V DC relay boards from Robocraze Website. We offer the best relay modules available. These 5V SPDT Relay are extremely easy to use, and they don't require any complicated wiring.

Wiring Diagrams for Arduino & Raspberry Pi Integration

Arduino Setup

Connect the relay module’s VCC to the Arduino’s 5 V output.
Connect GND of the relay module to Arduino GND.
Connect the signal input (IN1) on the relay to a digital I/O pin on the Arduino, e.g., digital pin 7.
On the load side: cut the live (or positive) wire of the device you want to switch, connect one end to the relay COM (common) terminal, the other end to NO or NC depending on behavior desired.

Example sketch:


int relayPin = 7;
void setup() {
  pinMode(relayPin, OUTPUT);
}

void loop() {
  digitalWrite(relayPin, HIGH);  // turn relay on
  delay(2000);
  digitalWrite(relayPin, LOW);   // turn relay off
  delay(2000);
}

Raspberry Pi Setup

Use the Pi’s 5 V output/D-pin and a GPIO pin for signal control.
Connect relay VCC to the 5V pin, relay GND to Pi GND.
Connect IN pin of the relay to a GPIO (e.g., GPIO17).
On the high-voltage side, cut the live wire of the device, connect one end to COM, the other to NO or NC.
Note: Some relay modules trigger on LOW rather than HIGH (check module specs).

Example (in Python):


import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
relay_pin = 17
GPIO.setup(relay_pin, GPIO.OUT)

while True:
    GPIO.output(relay_pin, GPIO.LOW)  # activates relay if module is active-LOW
    time.sleep(2)
    GPIO.output(relay_pin, GPIO.HIGH)
    time.sleep(2)

NO / NC (Normally Open / Normally Closed) Contacts

A relay has three main terminals on the output side:

COM (Common):
The central connection point of the relay. Your load (light, motor, fan, etc.) always connects through COM.
NO – Normally Open:
- In the default state (relay not activated), NO is not connected to COM — the circuit is open.
- When the relay activates, NO closes and connects to COM, allowing current to flow.
- Use NO when you want the device to stay OFF by default and turn ON only when the relay triggers.
NC – Normally Closed:
- In the default state (relay not activated), NC is connected to COM - the circuit is closed.
- When the relay activates, NC opens, breaking the connection.
- Use NC when you want the device to stay ON by default and turn OFF when the relay triggers.

When to Use Which?

Use NO:
- Lights
- Fans
- Motors
- Appliances you want OFF until triggered
Use NC:
- Security systems (buzzers that stay ON)
- Fail-safe circuits
- Emergency cutoff systems

Channel-Based Selection Guide

When selecting a relay module for your project from your collection (e.g., single channel, 2-channel, 4-channel, 8-channel), here’s a guide:
Single-Channel: Best for switching one device — e.g., one light, one fan. Simple, compact, low cost.
2-Channel / Dual-Channel: Good when you need to control two separate loads independently (e.g., light + fan, motor + pump).
4-Channel: Suitable for medium automation setups — multiple devices in one panel (e.g., whole room of lights, multiple sensors).
8-Channel (or more): Ideal for advanced setups, many loads, full-home automation panel, or robotics labs. More channels let you group control wiring, save space and cost versus many single modules.
Consider: trigger voltage (5 V), current rating of each channel (e.g., 10 A @ 250 VAC), type of trigger (active LOW vs active HIGH), and if channels are isolated (optocouplers) — important for safety in mixed-voltage setups.

Common Automation Project Ideas: Lights, Motors, Fans

Smart Lighting: Use a 5 V relay to switch a mains light bulb (cut the live wire, connect COM/NO) controlled via Arduino/Raspberry Pi.
Ceiling Fan Control: Use a relay module to toggle the fan’s supply line — integrate with a temperature or motion sensor to automate fan ON/OFF.
Motor Automation: For DC or AC motors (pump, conveyor, toy motor), use a relay board to control when the motor runs; integrate sensors (proximity, water level) for automation.
Home Appliance Scheduling: Program your controller (Arduino/Pi) to trigger the relay at set times to switch on kettle, heater, or charger.
Robotics/DIY Projects: Use relays to switch higher-power actuators or solenoids from your microcontroller without exposing the board to high current/voltage directly.

Uses of 5V Relay Module:

Relay modules with single channel boards are used to manage high voltage and high current loads such as solenoid valves, motors, AC loads and lamps. This module is primarily designed to interface with various microcontrollers such as PIC, Arduino, etc. We use relays extensively in automobiles, test and measurement equipment, power supplies, home automation systems, and more.

Relay Module Diagram:

5V Relay Price In India:

Item Name	Price
5V Relay Cube	17
5V 1 Channel made in INDIA - GL Make	36
5V 30A 1-Channel Relay Module	181
Waveshare Modbus RTU 8-channel Relay Module RS485	2599
DC 6V To 30V One Way Relay Module	279
NE555 Pulse Frequency Duty Cycle Adjustable Module	77
SLA 5V DC 4Pin 30A Power Relay	49
NE555 5V Delay Timer	67
5V 16 Channel Relay Module	625
8 Channel 5V Relay Board	247
4-Channel 5V Relay Board	130
2-Ch 5V relay Board	69
1CH 5v Optocoupler Relay Board	62
1 CH 5V Relay Board	49

Popular Searches

1. How to wire a 5V relay?

Relays switches turn on and off based on a controlling signal from given to the control pin of the relay.

With a microcontroller or a sensor, the digital control pin of the relay must be connected to a 5V capable output pin of a microcontroller or any controlling device like a sensor

2. How to use a 5V relay?

Giving 5V at the Relay control pin will close the circuit between N/O and COM, thereby switching on anything connected between the N/O and COM. At the same time, it will open the circuit between N/C and COM, thereby cutting off the circuit connected via the N/C port. Giving 0V or GND to the relay pin will do the vice versa

3. How to test a 5V relay?

If the relay switches at its designed actuation voltage, then the could be inferred to be working. You can easily make sure of this, by hooking up a multimeter at the relay terminals and observing the voltage before and after the switching action

4. How to trigger a 5V relay?

A 5V relay is triggered using a 5V signal given to its control pin. Any voltage below 5V would switch off the relay and anything more than 5V can potentially damage the relay

5. How much current does a 5V relay draw?

A nominal current consumption of a 5V relay is typically around 70mA, although it will vary between models. Please the check the relay specific datasheet to know the exact value

6. What is the use of a relay module?

Relay is an electrically controlled electronic on electro mechanic switch. Adding a relay will give the device the ability to control switching actions based on different intrinsic parameters

7. Where can I find a 5V relay online?

5V relays can be obtained from almost all online stores including Robocraze. The 5V relay module price on Robocraze is comparatively less among similar websites.

8. Where can I find a 5V relay nearby at a physical store?

5V relays are available in most electronic stores. One can easily buy Relay from Robocraze by choosing the store pick-up option.

9. What are 5 V relay modules used for?

A 5 V relay module acts like a remote-controlled switch. It uses a small low-voltage signal (5 V) to control a separate circuit that may have a much higher voltage or current. For example, you might use your microcontroller to send a 5 V signal to the relay module, and the relay would then turn on or off a 230 V AC light, a 12 V motor, or some other heavy-load device. Because the relay physically separates (â€œisolatesâ€) the control side from the load side, it helps protect your electronics while enabling you to switch bigger loads safely.

10. How many channels do these 5 V relays support?

The number of channels varies by module. Some boards are a â€œsingle-channelâ€ relay (just one relay switch), others offer 2, 4, 8, 10 channels or more. For example: a 10-channel 5 V relay board is offered for use with microcontrollers. So when selecting a relay module, check how many independent relay switches (channels) the board includes â€” more channels = more loads you can switch independently.

11. Can these relay modules be used with Arduino and Raspberry Pi?

Yes, in general you can use 5 V relay modules with both Arduino and Raspberry Pi, but with a few important caveats.With Arduino: Because most Arduino boards operate at 5 V logic, connecting a 5 V relay is straightforward: you power the module with 5 V, and an Arduino I/O pin triggers the relay.

With Raspberry Pi: Because many Pi GPIO pins operate at 3.3 V logic (and are not 5 V tolerant), you must ensure your relay module is compatible (for instance, uses an opto-isolator or has a level shifter) or provide proper interface.
Always check the module’s trigger voltage (what the “IN” pin expects), the power supply for the relay coil (the board usually needs a solid 5 V supply), and whether there is isolation or safe interfacing for the microcontroller’s logic side.

In short: yes you can, but check compatibility with your board, power supply, and how many loads you’re switching.

12. Are these relay modules pre-assembled and ready to use?

Yes, 5V relay modules work with Arduino directly. For Raspberry Pi (3.3V GPIO), use opto-isolated relay modules or level shifters to ensure compatibility. Always verify the module's trigger voltage, power supply requirements, and whether it has isolation protection. Check your specific board's voltage specifications before purchasing to avoid damage to your microcontroller.

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