This document describes an ultrasonic security system created with an Arduino board. It includes a theory section on how ultrasonic sensors and the Arduino UNO work. It also lists the required equipment including an Arduino UNO, ultrasonic sensor, buzzer, resistors, breadboard, and jumper wires. A diagram shows how to connect the components in a circuit. The document provides code to control the system, which uses the ultrasonic sensor to measure distance and activate different lights and sounds based on distance thresholds.

1. GREEN UNIVERSITY OF BANGLADESH

2. Introduction
Farzana Akter Moli
ID:191001162

3. Presentation Context
"Ultrasonic Security System by Arduino."

4. Table Of Content
• Theory
• Required equipment
• Diagram
• Procedure
• Code

5. Theory
• Arduino UNO

6. Theory
Ultrasonic sensor-HC-SR04

7. Required Equipment
Arduino UNO Ultrasonic sensor-HC-SR04
Buzzer Resistor 220 ꭥ
Breadboard
Jumper wires LED

8. Diagram
Fig: Circuit diagram of Ultrasonic Security System by Arduino
AREF
GND
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reset
3.3v
5v
GND
GND
Vin
A0
A1
A2
A3
A4
A5
USB
Power
Arduino UNO
Vcc
Triger
Echo
GND
+Vcc
+Vcc
220ꭥ
220ꭥ
220ꭥ
Red
Yellow
Green
Ultrasonic Sensor

9. • Assemble material
• Setup
• Assembly in Breadboard
Procedure

10. Code
#define trigPin 2
#define echoPin 3
#define LEDlampRed 4
#define LEDlampYellow 5
#define LEDlampGreen 6
#define soundbuzzer 7
int sound = 500;
void setup()
{
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(LEDlampRed, OUTPUT);
pinMode(LEDlampYellow, OUTPUT);
pinMode(LEDlampGreen, OUTPUT);
pinMode(soundbuzzer, OUTPUT);
}
void loop()
{
long durationindigit, distanceincm;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
durationindigit = pulseIn(echoPin, HIGH);
distanceincm = (durationindigit/2) / 29.1;
if (distanceincm < 50)
{digitalWrite(LEDlampGreen, HIGH);}
else {digitalWrite(LEDlampGreen, LOW);}
if (distanceincm < 20)
{digitalWrite(LEDlampYellow, HIGH);}
else {digitalWrite(LEDlampYellow,LOW);}
if (distanceincm < 5)
{digitalWrite(LEDlampRed, HIGH);
sound = 1000;}
else {digitalWrite(LEDlampRed,LOW);}
if (distanceincm > 5 || distanceincm <= 0)
{Serial.println("Outside the permissible
range of distances");
noTone(soundbuzzer);}
else
{Serial.print(distanceincm);
Serial.println(" cm");
tone(soundbuzzer, sound);}
delay(300);
}