This is Locally designed IoT Baord with ESP32 built in 8 ,relays , bi color led, one selector switch for any input / mode selection and a power switch.
It have builtin w5500 ethernet module which enable this iot development board to connect with lan network. 

Relays are being controlled using 75hc595 shift register and uln2803 Darlington driver ic, here is its example code test relays functionality.

// Define pin numbers
const int DATA_PIN = 32;  // Connect to the data (DS) pin of the 74HC595
const int LATCH_PIN = 33; // Connect to the latch (ST_CP) pin of the 74HC595
const int CLOCK_PIN = 25; // Connect to the clock (SH_CP) pin of the 74HC595

void setup() {
  pinMode(DATA_PIN, OUTPUT);
  pinMode(LATCH_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
}

void shiftOutData(byte data) {
  // Shift out each bit of the data byte
  for (int i = 7; i >= 0; --i) {
    digitalWrite(DATA_PIN, (data >> i) & 1); // Set the data pin to the current bit
    digitalWrite(CLOCK_PIN, HIGH);          // Pulse the clock pin (rising edge)
    digitalWrite(CLOCK_PIN, LOW);           // Reset the clock pin (falling edge)
  }
}

void loop() {
  // Cycle through the 8 LEDs (presumably connected to relays)
  for (int ledNum = 0; ledNum < 8; ++ledNum) {
    // Turn on the specific LED
    shiftOutData(1 << ledNum); // Shift out a single bit (LED on)
    digitalWrite(LATCH_PIN, HIGH); // Latch the data (rising edge)
    digitalWrite(LATCH_PIN, LOW);  // Reset the latch (falling edge)
    delay(1000); // Wait for a short duration (e.g., 1000 ms or 1 second)
    
    // Turn off the LED
    shiftOutData(0); // Shift out all zeros (LED off)
    digitalWrite(LATCH_PIN, HIGH); // Latch the data again
    digitalWrite(LATCH_PIN, LOW);
    delay(1000); // Wait again
  }
}

Key Features:

• WiFi and Bluetooth Connectivity: Connect to your home network via WiFi or control directly using Bluetooth.
• 8-Channel Relay Control: Manage up to 8 appliances independently.
• Real-Time Monitoring: Keep track of your devices through the Blynk App.

Specifications:

• 8-Channel 5V Relays: Each relay can handle up to 10A, making it suitable for various devices.
• LED Indicators: Clear visual feedback for relay status.

Installation and Setup:

1. Connectivity: Power up the board using a 5V DC supply. Pair it with your WiFi network or use Bluetooth for local control.

Use Cases:

• Lighting Control: Turn lights on/off remotely or manually.
• Appliance Automation: Control fans, pumps, or other devices.
• Security Systems: Integrate with alarms or door locks.
• Garden Irrigation: Set up watering schedules.

Why Choose Our ESP32 Relay Board?

• Reliable Performance: Built with quality components for long-lasting operation.