// Define the GPIO pins for your three LEDs
// You can change these to any suitable digital GPIO pin on your ESP32 board.
// Avoid pins used for specific functions like TX/RX (GPIO1, GPIO3) or strapping pins during boot.
const int ledPin1 = 16; // Example: Connecting the first LED to ESP32's GPIO 16
const int ledPin2 = 17; // Example: Connecting the second LED to ESP32's GPIO 17
const int ledPin3 = 4;  // Example: Connecting the third LED to ESP32's GPIO 4

// Define the blink interval (in milliseconds)
// This controls how long each state lasts before switching.
// 500 milliseconds = 0.5 seconds
const long blinkInterval = 500;

void setup() {
  // Initialize the serial communication for debugging (optional but recommended)
    Serial.begin(115200);
      Serial.println("ESP32 Three LED Blink Program Started!");

        // Set all LED pins as OUTPUTs
          pinMode(ledPin1, OUTPUT);
            pinMode(ledPin2, OUTPUT);
              pinMode(ledPin3, OUTPUT);

                // Initial state: Ensure all LEDs are off when the program starts.
                  digitalWrite(ledPin1, LOW); // LOW means 0V (LED off)
                    digitalWrite(ledPin2, LOW); // LOW means 0V (LED off)
                      digitalWrite(ledPin3, LOW); // LOW means 0V (LED off)
                      }

                      void loop() {
                        // --- Pattern 1: LED1 ON, others OFF ---
                          Serial.println("Pattern 1: LED1 ON");
                            digitalWrite(ledPin1, HIGH); // LED1 ON
                              digitalWrite(ledPin2, LOW);  // LED2 OFF
                                digitalWrite(ledPin3, LOW);  // LED3 OFF
                                  delay(blinkInterval);

                                    // --- Pattern 2: LED2 ON, others OFF ---
                                      Serial.println("Pattern 2: LED2 ON");
                                        digitalWrite(ledPin1, LOW);  // LED1 OFF
                                          digitalWrite(ledPin2, HIGH); // LED2 ON
                                            digitalWrite(ledPin3, LOW);  // LED3 OFF
                                              delay(blinkInterval);

                                                // --- Pattern 3: LED3 ON, others OFF ---
                                                  Serial.println("Pattern 3: LED3 ON");
                                                    digitalWrite(ledPin1, LOW);  // LED1 OFF
                                                      digitalWrite(ledPin2, LOW);  // LED2 OFF
                                                        digitalWrite(ledPin3, HIGH); // LED3 ON
                                                          delay(blinkInterval);

                                                            // You can add more complex patterns here if you wish!
                                                              // For example, having all LEDs on, or a chasing light effect.

                                                                // The loop() function will repeat these patterns indefinitely.
                                                                }