How to Use ESP32_Relay_X4_V1.1: Examples, Pinouts, and Specs

The ESP32_Relay_X4_V1.1 is a versatile module manufactured by LC that integrates an ESP32 microcontroller with four relays. This combination allows for wireless control of multiple high-power devices via Wi-Fi or Bluetooth. The module is ideal for home automation, industrial control, and IoT applications where remote control and monitoring are essential.

1. Power Supply: Connect the VCC pin to a 5V DC power source and the GND pin to the ground.
2. Relay Control: Connect the IN1, IN2, IN3, and IN4 pins to the GPIO pins of the ESP32 or any other microcontroller to control the relays.
3. Communication: Use the TX and RX pins for UART communication if needed.
4. GPIO: Utilize the GPIO0 and GPIO2 pins for additional input/output functionalities.
5. Enable Pin: Connect the EN pin to the 3.3V output to enable the ESP32.

• Isolation: Ensure proper isolation between the high-power relay contacts and the low-power control circuitry to prevent damage.
• Power Supply: Use a stable 5V DC power supply to avoid voltage fluctuations that could affect the ESP32's performance.
• Heat Dissipation: Provide adequate ventilation or heat sinks if the relays are switching high currents frequently.
• Debouncing: Implement software debouncing for the control signals to avoid false triggering of the relays.

#include <WiFi.h>

// Define relay control pins
#define RELAY1  5
#define RELAY2  18
#define RELAY3  19
#define RELAY4  21

// 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(RELAY1, OUTPUT);
  pinMode(RELAY2, OUTPUT);
  pinMode(RELAY3, OUTPUT);
  pinMode(RELAY4, 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");
}

void loop() {
  // Example: Turn on Relay 1 and Relay 2
  digitalWrite(RELAY1, HIGH);
  digitalWrite(RELAY2, HIGH);
  delay(5000); // Keep relays on for 5 seconds

  // Example: Turn off Relay 1 and Relay 2
  digitalWrite(RELAY1, LOW);
  digitalWrite(RELAY2, LOW);
  delay(5000); // Keep relays off for 5 seconds
}

1. ESP32 Not Connecting to Wi-Fi:

   • Solution: Double-check the SSID and password. Ensure the Wi-Fi network is operational and within range.

2. Relays Not Switching:

   • Solution: Verify the control signals are correctly connected and the GPIO pins are configured as outputs.

3. Power Supply Issues:

   • Solution: Ensure a stable 5V DC power supply. Check for loose connections or faulty power sources.

4. Overheating:

   • Solution: Provide adequate ventilation or use heat sinks if the relays are frequently switching high currents.

• Check Connections: Ensure all connections are secure and correctly wired.
• Use Multimeter: Use a multimeter to check voltage levels and continuity.
• Firmware Update: Ensure the ESP32 firmware is up-to-date.
• Debugging: Use serial print statements to debug and monitor the ESP32's status.

By following this documentation, users can effectively utilize the ESP32_Relay_X4_V1.1 module for various applications, ensuring reliable and efficient control of high-power devices.