How to Use 4way channel relay: Examples, Pinouts, and Specs

The 4-Way Channel Relay Module, manufactured by SONGLE (Part ID: RELAY MODULE), is an electromechanical switch that allows you to control four separate circuits using a single control signal. This module is commonly used in automation and control systems to manage multiple devices or loads. It is ideal for applications where multiple devices need to be controlled independently, such as home automation, industrial automation, and robotics.

1. Power Supply: Connect the VCC pin to a 5V DC power supply and the GND pin to the ground.
2. Control Signals: Connect the IN1, IN2, IN3, and IN4 pins to the digital output pins of a microcontroller (e.g., Arduino UNO).
3. Load Connections: Connect the devices or loads to the NO (Normally Open) or NC (Normally Closed) terminals of each relay, depending on your requirements. The COM (Common) terminal is the shared connection point.

• Ensure that the power supply voltage is stable and within the specified range (5V DC).
• Use appropriate flyback diodes across the relay coils to protect the microcontroller from voltage spikes.
• Avoid exceeding the maximum switching voltage and current ratings to prevent damage to the relay module.
• Use proper insulation and safety measures when dealing with high voltage AC loads.

/*
  Example code to control a 4-way channel relay module using Arduino UNO.
  This code will sequentially turn on and off each relay with a 1-second delay.
*/

const int relay1 = 2; // Pin connected to IN1
const int relay2 = 3; // Pin connected to IN2
const int relay3 = 4; // Pin connected to IN3
const int relay4 = 5; // Pin connected to IN4

void setup() {
  // Initialize the relay control pins as outputs
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);

  // Set all relays to off (HIGH state)
  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, HIGH);
  digitalWrite(relay3, HIGH);
  digitalWrite(relay4, HIGH);
}

void loop() {
  // Turn on Relay 1
  digitalWrite(relay1, LOW);
  delay(1000); // Wait for 1 second

  // Turn off Relay 1 and turn on Relay 2
  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, LOW);
  delay(1000); // Wait for 1 second

  // Turn off Relay 2 and turn on Relay 3
  digitalWrite(relay2, HIGH);
  digitalWrite(relay3, LOW);
  delay(1000); // Wait for 1 second

  // Turn off Relay 3 and turn on Relay 4
  digitalWrite(relay3, HIGH);
  digitalWrite(relay4, LOW);
  delay(1000); // Wait for 1 second

  // Turn off Relay 4
  digitalWrite(relay4, HIGH);
  delay(1000); // Wait for 1 second
}

1. Relays Not Activating: Ensure that the control signals are correctly connected and that the microcontroller is providing the correct voltage levels.
2. Power Supply Issues: Verify that the power supply is stable and within the specified range (5V DC).
3. Load Not Switching: Check the connections to the NO, NC, and COM terminals and ensure that the load does not exceed the relay's maximum ratings.

• Check Connections: Double-check all wiring connections to ensure they are secure and correctly placed.
• Measure Voltages: Use a multimeter to measure the voltage at the control pins and the power supply to ensure they are within the specified range.
• Inspect Code: Review the code to ensure that the correct pins are being used and that the logic is correct.
• Test Relays Individually: Test each relay individually to isolate any issues with specific relays or connections.

By following this documentation, users should be able to effectively utilize the 4-Way Channel Relay Module in their projects, ensuring reliable and efficient control of multiple devices or loads.