4 Channel 5V Relay Module with Optocoupler

A 4x5V Opto-Isolated Relay Module is a board that contains 4 relays, each of which can be controlled by a microcontroller (like Arduino, ESP32, etc.) to switch AC or DC loads. Opto-isolation ensures that your control circuit is electrically isolated from the high-voltage side, enhancing safety.

Technical Specifications:

Operating Voltage: 5V DC
Relay Channels: 4
Trigger Signal Voltage: 0V (LOW) = ON, 5V (HIGH) = OFF (for LOW-level trigger boards)
Relay Type: SPDT (Single Pole Double Throw)
Indicator LEDs: Yes (One per relay, lights up when relay is ON)
Relay Contact Ratings: - 10A @ 250V AC & 10A @ 30V DC
Control Interface Pins: IN1, IN2, IN3, IN4, GND, VCC (+ JD-VCC on some boards)
Input Logic: TTL compatible (3.3V or 5V logic signals accepted, depending on the board)
Mounting Holes: Usually 4 holes, one in each corner

Pinouts:

Connection with Arduino:

Relay Module Pin	Arduino Uno Pin	Description
IN1	D7	Controls Relay 1
IN2	D6	Controls Relay 2
IN3	D5	Controls Relay 3
IN4	D4	Controls Relay 4
VCC	5V	Logic Power For Arduino
GND	Gnd	Common ground
JD-VCC	5V (connected via jumper to VCC)	Relay Coil Power

Relay Output Terminal Layout (Per Relay)

Terminal	Full Name	Function
NO	Normally Open	Disconnected when the relay is OFF. Connected to COM when the relay is ON. (Used to turn something ON when the relay is triggered)
COM	Common	Common terminal between NO and NC. This is the central connection point.
NC	Normally Close	Connected to COM when the relay is OFF. Disconnected when the relay is ON. (Used to turn something OFF when the relay is triggered)

Sample code:

// Define relay control pins
int relay1 = 7;
int relay2 = 6;
int relay3 = 5;
int relay4 = 4;

void setup() {
// Set all relay pins as output
pinMode(relay1, OUTPUT);
pinMode(relay2, OUTPUT);
pinMode(relay3, OUTPUT);
pinMode(relay4, OUTPUT);

// Initialize all relays to OFF (HIGH for LOW-trigger modules)
digitalWrite(relay1, HIGH);
digitalWrite(relay2, HIGH);
digitalWrite(relay3, HIGH);
digitalWrite(relay4, HIGH);
}

void loop() {
// Turn ON relay 1
digitalWrite(relay1, LOW);
delay(1000);
digitalWrite(relay1, HIGH);

// Turn ON relay 2
digitalWrite(relay2, LOW);
delay(1000);
digitalWrite(relay2, HIGH);

// Turn ON relay 3
digitalWrite(relay3, LOW);
delay(1000);
digitalWrite(relay3, HIGH);

// Turn ON relay 4
digitalWrite(relay4, LOW);
delay(1000);
digitalWrite(relay4, HIGH);

delay(2000); // Wait before repeating the cycle
}

4 Channel 5V DC High Level Trigger Control Relay Module

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