How to Use 5v 2-Relay JD-VCC: Examples, Pinouts, and Specs

The 5V 2-Relay Module with JD-VCC power supply input is an electronic device used to control high voltage/current loads. It allows a low-power signal from a microcontroller, such as an Arduino, to control larger power circuits. This module is commonly used in automation projects, home appliances control, and in switching devices on and off.

• Home automation systems
• Industrial controls
• Automotive electronics
• Remote controlled switches

• Operating Voltage (VCC): 5V
• Relay Power Supply (JD-VCC): 4.5V to 5.5V
• Current Consumption: Approx. 70mA per relay
• Maximum Switching Voltage: 250VAC / 30VDC
• Maximum Switching Current: 10A (AC) / 10A (DC)
• Control Signal Voltage: 0V - 0.5V (LOW), 2.5V - 5V (HIGH)
• Control Signal Current: 2mA - 20mA

1. Power Connections:

   • Connect the JD-VCC pin to an external 5V power supply if isolation between the relay power and control signal is needed.
   • Connect the VCC pin to the 5V output of the microcontroller if isolation is not required.
   • Connect the GND pin to the ground of the power supply and microcontroller.

2. Control Signal:

   • Connect IN1 and IN2 to digital output pins on the microcontroller to control Relay 1 and Relay 2, respectively.

3. Load Connections:

   • Connect the device you want to control to the NO (Normally Open) or NC (Normally Closed) and COM (Common) pins of the relay.

• Ensure that the power supply for JD-VCC is capable of delivering sufficient current for the number of relays being used.
• Do not exceed the maximum voltage/current ratings of the relays to prevent damage.
• Use flyback diodes when controlling inductive loads to prevent back EMF damage.
• Always ensure proper isolation between the low voltage control circuit and high voltage load circuit for safety.

// Define relay control pins
#define RELAY1_PIN  7
#define RELAY2_PIN  8

void setup() {
  // Set relay pins as outputs
  pinMode(RELAY1_PIN, OUTPUT);
  pinMode(RELAY2_PIN, OUTPUT);
}

void loop() {
  // Turn Relay 1 ON
  digitalWrite(RELAY1_PIN, LOW); // Assumes active LOW relays
  delay(1000); // Wait for 1 second
  
  // Turn Relay 1 OFF
  digitalWrite(RELAY1_PIN, HIGH);
  delay(1000); // Wait for 1 second
  
  // Turn Relay 2 ON
  digitalWrite(RELAY2_PIN, LOW);
  delay(1000); // Wait for 1 second
  
  // Turn Relay 2 OFF
  digitalWrite(RELAY2_PIN, HIGH);
  delay(1000); // Wait for 1 second
}

• Relay not activating: Check the control signal voltage and connections.
• Intermittent operation: Ensure that the power supply is stable and can provide enough current.
• Clicking sound but no switching: Verify the load does not exceed the relay's maximum ratings.

• Double-check wiring, especially the power supply to JD-VCC, VCC, and ground connections.
• Use a multimeter to check the control signal voltage at IN1 and IN2.
• Ensure that the microcontroller's digital output pins are configured correctly.

Q: Can I power the module using the same 5V from the Arduino? A: Yes, you can power the module using the 5V from the Arduino if isolation between the relay power and control signal is not required.

Q: What does JD-VCC stand for? A: JD-VCC refers to the relay power supply input, which can be used to separate the relay power from the control logic power.

Q: Can I control AC and DC loads with this relay module? A: Yes, the relay module can switch both AC and DC loads within its specified voltage and current ratings.