int Sinput = A1;    // Sensor input signal pin (A1)
int Buz = 3;         // Buzzer output pin (digital pin 3)
 
unsigned long previousMillis = 0;  // Store the last time the buzzer was triggered
const long interval = 2000;        // 2 seconds delay for the buzzer
 
void setup() {  
  pinMode(Sinput, INPUT);  // Set sensor pin as input
  pinMode(Buz, OUTPUT);    // Set buzzer pin as output
}
 
void loop() {
  unsigned long currentMillis = millis();  // Get current time
 
  // Check if the sensor input is LOW (inactive state)
  if(digitalRead(Sinput) == LOW) {
    // If 2 seconds have passed since the last buzzer trigger, turn it on
    if(currentMillis - previousMillis >= interval) {
      digitalWrite(Buz, HIGH); // Turn on buzzer
    }
  } else {
    // If the sensor input is HIGH (active state), turn off the buzzer
    digitalWrite(Buz, LOW);  // Turn off buzzer
  }
}
 

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