Smart Car Barrier System

A mini car barrier system that automatically lifts up when vehicle approaching.

HYuiii

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Description

The project is about creating a mini car barrier systems by using Ultrasonic sensor and Servo module. When there is vehicle approaching, the barrier will lift up automatically.

Details

This is a mini project to realise the application of the combination of ultrasonic sensor and servo module. The car barrier will automatically lift up when the ultrasonic sensor senses a vehicle coming.

Components

1 × RTL8722DM_MINI
1 × HC-SR04 Ultrasonic module
1 × Tower Pro SG90 servo module
2 × Paper clips
1 × Blue tag

Build Instructions

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1

Circuit Connection

The circuit connection is as shown in the figure below.

Code

#include<AmebaServo.h>

AmebaServo myservo;
const int trigPin=3;
const int echoPin=5; 
long duration;
int distance;

void setup() {
  Serial.begin(9600);
  myservo.attach(9);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT); 
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

// measure time duration of pulse HIGH at echo pin
duration=pulseIn(echoPin, HIGH);

// calculate the distance from car to sensor
distance=(0.034*duration)/2;

if(distance<=10){
  myservo.write(90);
  }
else{
  myservo.write(0);
  }
  
  Serial.print("distance: ");
  Serial.println(distance);
  Serial.print(" cm");
  delay(1);
}