Army safety project code

 Arduino code 👇

// ---------------------------------------------------------------- //

// Arduino Ultrasoninc Sensor HC-SR04

// Re-writed by Innovative ideas

// Using Arduino IDE 1.8.7

// Using HC-SR04 Module

// Tested on 8 September 2021

// ---------------------------------------------------------------- //

#include <Servo.h>

Servo myservo;

#define echoPin 8 // attach pin D8 Arduino to pin Echo of HC-SR04

#define trigPin 9 //attach pin D9 Arduino to pin Trig of HC-SR04

#define buzzer 13 

// defines variables

long duration; // variable for the duration of sound wave travel

int distance; // variable for the distance measurement

void setup() {

  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT

  pinMode(buzzer, OUTPUT);

  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT

  Serial.begin(9600); // // Serial Communication is starting with 9600 of baudrate speed

  Serial.println("Ultrasonic Sensor HC-SR04 Test"); // print some text in Serial Monitor

  Serial.println("with Arduino UNO R3");

  Serial.begin(9600);

  myservo.attach(7);

  myservo.write(0);

}

void loop() {

  // Clears the trigPin condition

  digitalWrite(trigPin, LOW);

  delayMicroseconds(2);

  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds

  digitalWrite(trigPin, HIGH);

  delayMicroseconds(10);

  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; // Speed of sound wave divided by 2 (go and back)

  // Displays the distance on the Serial Monitor

  Serial.print("Distance: ");

  Serial.print(distance);

  Serial.println(" cm");

  if(distance < 20)

  {

    myservo.write(150);

    digitalWrite(buzzer,HIGH);

    delay(2000);

    digitalWrite(buzzer,LOW);

    delay(2000);

    

    

  }

}