We can determine any object presents by Ultrasonic sensor and Arduino.

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);
}