Blinking LED rev_01

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    - Project: Blinking LED
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2025-10-13 21:02:09

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* blink led every 2 seconds */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES *****/

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

// Global state for LED blinking
const int LED_PIN = 13; // UNO built-in LED on digital pin 13
bool ledOn = false;     // current LED state
unsigned long previousMillis = 0; // last time LED was toggled
const unsigned long INTERVAL = 1000; // 1 second interval to achieve 2 second blink cycle

void setup(void)
{
    // put your setup code here, to run once:
    pinMode(LED_PIN, OUTPUT);
    digitalWrite(LED_PIN, LOW); // ensure LED starts in the OFF state
    previousMillis = millis();
}


void loop(void)
{
    // put your main code here, to run repeatedly:
    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= INTERVAL)
    {
        previousMillis = currentMillis;
        ledOn = !ledOn;
        digitalWrite(LED_PIN, ledOn ? HIGH : LOW);
    }
}

/* END CODE */