//This code is for project of Arjun, Sumit, Unnat, Jinay Div.K of B.Tech Cybersecurity // defines pins numbers const int trigPin = 9; const int echoPin = 10; const int buzzer = 11; const int ledPin = 13; // defines variables long duration; int distance; int safetyDistance; void setup() { pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output pinMode(echoPin, INPUT); // Sets the echoPin as an Input pinMode(buzzer, OUTPUT); pinMode(ledPin, OUTPUT); Serial.begin(9600); // Starts the serial communication } void loop() { // Clears the trigPin digitalWrite(trigPin, LOW); delayMicroseconds(2); // Sets the trigPin on HIGH state for 11 micro seconds digitalWrite(trigPin, HIGH); delayMicroseconds(11); digitalWrite(trigPin, LOW); // Reads the echoPin, returns the sound wave travel time in microseconds duration = pulseIn(echoPin, HIGH); // Calculating the distance distance= duration*0.034/2; safetyDistance = distance; if (safetyDistance <= 35) // You can change safe distance from here changing value Ex. 20 , 40 , 60 , 80 , 100, all in cm { digitalWrite(buzzer, HIGH); digitalWrite(ledPin, HIGH); } else { digitalWrite(buzzer, LOW); digitalWrite(ledPin, LOW); } // Prints the distance on the Serial Monitor accessible through IDE Serial.print("Distance: "); Serial.println(distance); }