Building Intrusion Detection System with Arduino and Ultrasonic Sensor

Components
Code Compiler
const int trig_pin = 11;
int Echo_pin = 6;

long duration;
int distance;

void setup() {
pinMode(trig_pin,);
pinMode(Echo_pin , INPUT );
Serial.begin(9600);
}

void loop() {
digitalWrite(trig_pin,);
delayMicroseconds(2);
digitalWrite(trig_pin,);
delayMicroseconds(10);
digitalWrite(trigPin, );
duration = pulseIn(Echo_pin,);
distance= duration*0.034/2;
Serial.print("Distance: ");
Serial.println(distance);
}

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