5V Relay Module

Description

What it is

The HK3FF DC5V SHG relay with 5 pin connectors is an electronic component designed to control electrical devices directly from Arduino. This type of relay allows managing the power supply of external circuits without risking damage to the microcontroller.

Features

• Type: HK3FF DC5V SHG Relay
• Connection: 5 pin connectors
• Power Supply: 5V

What it is for

Ideal for beginners, the HK3FF relay can be used to control 5V powered electrical devices. It is suitable for projects such as simple home alarm systems that activate a siren when a door is opened.

Tutorial: How to Use HK3FF DC5V SHG 5 Pin Relay

The HK3FF relay is an essential component for controlling electrical devices from Arduino. Ideal for beginners, it allows managing the current flow to other circuits without risking damage to the microcontroller.

What you need

• Arduino Uno
• USB Cable
• Breadboard
• LED
• 220 Ohm Resistor

Steps

1. Connect the relay to the Arduino board using a breadboard. Check the polarity of the pins.
2. Connect the Arduino to the computer via USB cable and install the Arduino IDE if it is not already installed.
3. Download the sketch provided in the tutorial and upload it to the Arduino.
4. Connect the LED to the digital port of the Arduino through a resistor to limit the current.
5. Verify that the relay activates when the LED turns on, interrupting or completing the circuit.
6. Modify the sketch to change the relay activation times and observe the differences.
7. Test the software interface (if present) to control the relay without physically connecting the Arduino.
8. Verify that everything works correctly before using the relay with devices at higher voltages.

Example code

void setup() {
  pinMode(13, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH); // Attiva il relè
  delay(5000);            // Attende per 5 secondi
  digitalWrite(13, LOW);  // Disattiva il relè
  delay(5000);
}

Mini project

Create a simple home alarm system that activates a siren (connected to the relay) when a door is opened.

Common mistakes

• Incorrect pin connection of the relay
• Not verifying the battery polarity
• Choosing an electrical device with too much power for the relay
• Using Arduino without uploading the sketch

Recommended accessories

• 9V batteries
• Low consumption siren
• Terminal block
• Motion sensors

Frequently asked questions

Can the relay handle devices with higher voltage?
Check the datasheet for the maximum power supported.

How can I protect the Arduino from a short circuit?
Add fuses or protection diodes to the Arduino pins.

What other modules can be controlled with this relay?
Other relays, electric actuators, small motors.