How to Use LC-Relay-ESP12-2R-D8: Examples, Pinouts, and Specs

The LC-Relay-ESP12-2R-D8 is a versatile relay module that integrates an ESP12 Wi-Fi module, enabling remote control of two relays via Wi-Fi. This component is ideal for Internet of Things (IoT) applications, allowing users to switch devices on and off remotely. Common use cases include home automation, industrial control systems, and smart appliances.

1. Power Supply: Connect the VCC pin to a 5V power supply and the GND pin to the ground.
2. Control Signals: Connect IN1 and IN2 to the digital output pins of a microcontroller (e.g., Arduino UNO) to control the relays.
3. Wi-Fi Configuration: Use the TX and RX pins to communicate with the ESP12 module for Wi-Fi configuration.
4. Relay Outputs: Connect the devices you want to control to the relay output terminals (NO, COM, NC).

• Ensure the power supply is stable and within the specified voltage range.
• Use appropriate flyback diodes across relay coils to protect against voltage spikes.
• Avoid exceeding the maximum current and voltage ratings of the relays.
• Securely mount the module to prevent short circuits and mechanical damage.

#include <ESP8266WiFi.h>

// Define relay control pins
const int relay1Pin = D1; // GPIO5
const int relay2Pin = D2; // GPIO4

// Wi-Fi credentials
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize relay control pins as outputs
  pinMode(relay1Pin, OUTPUT);
  pinMode(relay2Pin, OUTPUT);

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Turn off relays initially
  digitalWrite(relay1Pin, LOW);
  digitalWrite(relay2Pin, LOW);
}

void loop() {
  // Example: Toggle relays every 5 seconds
  digitalWrite(relay1Pin, HIGH); // Turn on Relay 1
  delay(5000);                   // Wait for 5 seconds
  digitalWrite(relay1Pin, LOW);  // Turn off Relay 1

  digitalWrite(relay2Pin, HIGH); // Turn on Relay 2
  delay(5000);                   // Wait for 5 seconds
  digitalWrite(relay2Pin, LOW);  // Turn off Relay 2
}

1. Wi-Fi Connection Problems:

   • Ensure the SSID and password are correct.
   • Check if the Wi-Fi signal is strong enough.

2. Relays Not Switching:

   • Verify the control signals (IN1 and IN2) are correctly connected.
   • Ensure the power supply is adequate.

3. Module Not Powering On:

   • Check the VCC and GND connections.
   • Ensure the power supply provides sufficient current.

• Wi-Fi Connection: Use a Wi-Fi analyzer app to check signal strength and interference.
• Control Signals: Use a multimeter to verify the voltage levels on IN1 and IN2.
• Power Supply: Use a regulated power supply to avoid voltage fluctuations.

By following this documentation, users can effectively integrate and utilize the LC-Relay-ESP12-2R-D8 in their IoT projects, ensuring reliable and efficient remote control of devices.