5V Relay Module for Arduino

Wiring Connections:

VCC: Connect to the 5V pin of the Arduino or an external 5V power source.
GND: Connect to the ground (GND) pin of the Arduino or the power source.
IN (Control Pins): Connect these pins to the digital output pins of the Arduino that will control each relay. For example, if you have a 4-channel relay module, you’ll have 4 control pins.
NO (Normally Open): Connect to the load or device you want to control. This pin is used to switch the device on or off.
COM (Common): Connect to the power supply for the load or device. It is the common terminal for the relay.
NC (Normally Closed): This is an alternative connection that allows the device to be on when the relay is not activated. Connect to the load or device if you want it to be normally on.
Power:

Voltage Supply: Requires a 5V DC power supply for operation.
Current Consumption: Generally low, but ensure the power source can handle the total current required by all relays when they are active.
Input and Output:

Input:
Signal Voltage: 5V logic signal from the Arduino to control the relays.
Current: Very minimal,  less than 20mA per control pin.
Output:
Relay Contacts: Can handle up to 10A current for each relay channel, suitable for switching high-power devices.
Physical Characteristics:

Size: Compact module design,  around 7×5 cm for a 4-channel version.
Mounting: Usually comes with mounting holes or a PCB design for easy integration into various projects.
Connectors: Features screw terminals for easy connection of external devices and power.
Technical Specifications:

Relay Type: SPDT (Single Pole Double Throw) or similar
Contact Rating: Up to 10A at 250V AC or 30V DC
Control Voltage: 5V DC for relay activation
Isolation Voltage: Usually up to 2500V AC between control and load circuits
Operating Temperature:  operates between 0°C to 85°C
Additional Features:

Protection Diodes: Often includes flyback diodes across the relay coils to protect against voltage spikes.
Manual Override: Some modules may have manual switches to control the relays without needing a microcontroller.
How to Use:

Connect the Power Supply:
VCC: Connect the VCC pin of the relay module to the 5V output on your Arduino.
GND: Connect the GND pin to the ground pin on your Arduino.
Wire the Control Pins:
Control Signals: Connect the IN pins of the relay module to the digital output pins on your Arduino.
Connect the Load:
NO and COM: Connect the load to the NO and COM terminals of the relay. The load will be controlled by the relay when it is activated.
NC (if needed): If you need the device to be on when the relay is not active, connect it to the NC terminal.
Upload Code:
Arduino Code: Write and upload code to the Arduino to control the relays. Use digitalWrite() to set the control pins HIGH or LOW to turn the relays on or off.
cpp

Copy code

int relayPin = 7; // Example pin connected to relay IN1

void setup() {

pinMode(relayPin, OUTPUT);

}

void loop() {

digitalWrite(relayPin, HIGH); // Turn on relay

delay(1000); // Wait for 1 second

digitalWrite(relayPin, LOW); // Turn off relay

delay(1000); // Wait for 1 second

}

Test the Module:
Power On: Ensure everything is connected correctly and then power up the Arduino.
Verify Operation: Check if the relay switches the connected device on and off as expected.
The 5V Relay Module for Arduino is an essential component for controlling high-power devices with a low-power microcontroller. Its easy integration and reliable operation make it a popular choice for many electronics projects.