4-Channel 5V Relay Module

Description

4-Channel 5V Relay Module

The 5V four-channel relay module is a switching device for controlling AC and DC loads. It is compatible with microcontrollers such as Arduino and Raspberry Pi, allowing electrical devices to be controlled remotely.

Detailed Specifications

• Relay type: Electromechanical relay
• Number of channels: 4
• Control voltage: 5V DC
• Rated current: 10A
• Contact configuration: SPDT (Single Pole Double Throw)
• Load rating: AC250V 10A, DC30V 10A
• LED indicators: Indicate relay status
• Dimensions: 92 x 46 x 20 mm
• Trigger: Active LOW
• Isolation: Optocoupler isolation

How It Works

An electromagnetic coil activated by a 5V control voltage opens or closes the relay contacts. This lets a low-voltage control signal switch higher-power electrical loads while providing effective isolation and reliable switching.

Applications

• Industrial automation: Switching motors, heaters, and other industrial equipment.
• Security systems: Activating sirens or signaling devices in alarm systems.
• Home automation: Controlling lighting and electrical appliances in smart homes.
• Electronics projects: Prototyping and development with Arduino and other microcontrollers.

How to Use It with an Arduino Uno

Required components:

• 1 x 5V 4-channel relay module
• 1 x Arduino Uno
• Connecting wires
• Breadboard

Wiring instructions:

1. Power the module: Connect VCC to the Arduino 5V pin and GND to Arduino GND.
2. Control inputs: Connect IN1 through IN4 to Arduino digital outputs (for example, pins 7, 8, 9, and 10).
3. Load connections: Connect the relay output terminals (NO and COM) to the load. NO is normally open and closes when the relay is activated.

Arduino Uno code example:

const int relaisPins[4] = {7, 8, 9, 10}; // Pins de commande des relais


void setup() {
  for(int i = 0; i < 4; i++) {
    pinMode(relaisPins[i], OUTPUT); // Définit chaque pin de commande comme une sortie
  }
}


void loop() {
  for(int i = 0; i < 4; i++) {
    digitalWrite(relaisPins[i], LOW); // Active chaque relais
  }
  delay(5000); // Attend 5 secondes


  for(int i = 0; i < 4; i++) {
    digitalWrite(relaisPins[i], HIGH); // Désactive chaque relais
  }
  delay(5000); // Attend 5 secondes
}

Code Explanation

1. Control pin declaration: Arduino Uno pins 7, 8, 9, and 10 are configured as outputs for the relays.
2. Relay setup: In setup(), the control pins are initialized as outputs.
3. Main loop:
   • Each relay is activated with a LOW signal on its control pin, closing the connected circuit.
   • The program waits 5 seconds.
   • The relays are deactivated with a HIGH signal, opening the circuits.
   • The program waits another 5 seconds before repeating.

Pinout

• VCC: 5V power supply
• GND: Ground (GND)
• IN1 to IN4: Control inputs for the relays, connected to Arduino digital outputs
• NO1 to NO4: Normally open terminals, connected to each load
• COM1 to COM4: Common terminals, connected to the load’s power supply

 
Keywords: solid-state relay, 4-channel module, industrial automation, automatic lighting, home automation, relay, channel.