// http://robotronix.co.il

int ledRed = 2;       // Set GPIO 2 for the red LED
int ledBlue = 4;      // Set GPIO 4 for the blue LED

void setup() {        // Runs once when the ESP32 starts

    pinMode(ledRed, OUTPUT);   // Set red LED pin as output
    pinMode(ledBlue, OUTPUT);  // Set blue LED pin as output

    Serial.begin(115200);     // Start serial communication
    Serial.println("Hello, ESP32!"); // Print a message
}

void loop() {         // Runs repeatedly

    digitalWrite(ledRed, HIGH);  // Turn ON red LED
    digitalWrite(ledBlue, LOW);  // Turn OFF blue LED
    delay(1000);                 // Wait 1 second

    digitalWrite(ledRed, LOW);   // Turn OFF red LED
    digitalWrite(ledBlue, HIGH); // Turn ON blue LED
    delay(1000);                 // Wait 1 second
}