// www.robotronix.co.il
// Embedded Systems Programming Course
// Robotics, Microcontrollers, Arduino and ESP32

#define led 4          // LED connected to GPIO 4
#define button 12      // Button connected to GPIO 12

int buttonState;       // Store the button state

void setup() {         // Run once at startup

    Serial.begin(115200); // Start serial communication
    Serial.println("System started"); // Print startup message

    pinMode(button, INPUT_PULLUP); // Enable internal pull-up resistor
    pinMode(led, OUTPUT);          // Set LED pin as output
}

void loop() {          // Run continuously

    buttonState = digitalRead(button); // Read button state

    if (buttonState == LOW) {     // Check if button is pressed

        Serial.println("LED ON"); // Print LED status
        digitalWrite(led, HIGH);  // Turn LED ON
    }

    if (buttonState == HIGH) {    // Check if button is released

        Serial.println("LED OFF"); // Print LED status
        digitalWrite(led, LOW);   // Turn LED OFF
    }

    delay(100);        // Wait 100 ms
}