How to Use RELAY: Examples, Pinouts, and Specs

The RELAY KAKI 4 is an electrically operated switch manufactured by 12V. It is designed to control a circuit by a low-power signal or to control several circuits with a single signal. Relays are essential components in various applications, including home automation, industrial control systems, and automotive electronics.

• Home Automation: Used to control lights, fans, and other household appliances.
• Industrial Control Systems: Employed in machinery to control high-power devices.
• Automotive Electronics: Utilized in vehicles to manage various electrical systems.
• Safety Systems: Implemented in alarm systems and emergency shutdown mechanisms.

1. Power the Relay Coil:

   • Connect the Coil+ pin to a 12V DC power source.
   • Connect the Coil- pin to the ground.

2. Control the Load:

   • Connect the load to the COM pin.
   • Connect the other end of the load to either the NO or NC pin, depending on the desired operation:
     • NO (Normally Open): The load is off when the relay is not energized and on when the relay is energized.
     • NC (Normally Closed): The load is on when the relay is not energized and off when the relay is energized.

3. Control Signal:

   • Use a low-power control signal (e.g., from a microcontroller) to energize the relay coil.

• Diode Protection: Place a flyback diode across the relay coil to protect against voltage spikes.
• Current Rating: Ensure the load current does not exceed the relay's contact rating.
• Isolation: Use optocouplers for additional isolation between the control signal and the relay.

/*
 * Example code to control a RELAY KAKI 4 with an Arduino UNO.
 * The relay is connected to pin 7 of the Arduino.
 */

const int relayPin = 7; // Pin connected to the relay

void setup() {
  pinMode(relayPin, OUTPUT); // Set the relay pin as an output
}

void loop() {
  digitalWrite(relayPin, HIGH); // Turn the relay on
  delay(1000); // Wait for 1 second
  digitalWrite(relayPin, LOW); // Turn the relay off
  delay(1000); // Wait for 1 second
}

1. Relay Not Switching:

   • Cause: Insufficient voltage or current to the relay coil.
   • Solution: Ensure the power supply provides 12V DC and sufficient current.

2. Load Not Responding:

   • Cause: Incorrect wiring of the load to the relay contacts.
   • Solution: Verify the load is connected to the correct COM and NO/NC pins.

3. Relay Chattering:

   • Cause: Unstable control signal or insufficient power supply.
   • Solution: Stabilize the control signal and ensure a stable power supply.

• Check Connections: Ensure all connections are secure and correct.
• Use a Multimeter: Measure voltages and continuity to diagnose issues.
• Consult Datasheets: Refer to the relay's datasheet for detailed specifications and guidelines.

By following this documentation, users can effectively integrate the RELAY KAKI 4 into their projects, ensuring reliable and efficient operation.