**Intruder Alert** rev_01

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    - Project: **Intruder Alert**
    - Source Code NOT compiled for: Arduino Uno
    - Source Code created on: 2024-12-11 00:23:07

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* Im working on a project where i use a PIR HC-SR501 */
    /* a led and a buzzer, the idea is that the PIR */
    /* detects movement and the buzzer with the led turn */
    /* on for 2 seconds , after that I need the PIR to */
    /* identify movement again but instantly */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

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

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

// USER CODE
int pir_pin = 2;
int led_pin = 3;
int buzzer_pin = 4;
unsigned long start_time = 0; // Variable to store the start time
bool intruder_detected = false; // Intruder detection state

void setup(void)
{
  // put your setup code here, to run once:
  pinMode(pir_pin, INPUT);
  pinMode(led_pin, OUTPUT);
  pinMode(buzzer_pin, OUTPUT);
  Serial.begin(9600);
}

void loop(void)
{
  // put your main code here, to run repeatedly:
  if (digitalRead(pir_pin) == HIGH)
  {
    if (!intruder_detected) // Only activate if not previously detected
    {
      intruder_detected = true;
      start_time = millis(); // Record the start time
      digitalWrite(led_pin, HIGH);
      digitalWrite(buzzer_pin, HIGH);
      Serial.println("Intruder detected");
    }

    // Turn off the buzzer and LED after 2 seconds
    if (millis() - start_time >= 2000)
    {
      digitalWrite(buzzer_pin, LOW);
      digitalWrite(led_pin, LOW);
      intruder_detected = false; // Reset the state to allow for immediate detection again
    }
  }
  else
  {
    // If no intruder is detected, keep the LED and buzzer off
    digitalWrite(led_pin, LOW);
    digitalWrite(buzzer_pin, LOW);
    Serial.println("Monitoring");
  }
}

/* END CODE */