Ultrasonic Security System with Object Distance Display

A measuring device that also doubles as a burglar alarm, using an ultrasonic sensor and LCD.

Jul 23, 2018

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measurement

security

monitoring

Components and supplies

Resistor 221 ohm

Jumper wires (generic)

Buzzer

Standard LCD - 16x2 White on Blue

5 mm LED: Red

5 mm LED: Yellow

5 mm LED: Green

Ultrasonic Sensor - HC-SR04 (Generic)

Arduino UNO

Single Turn Potentiometer- 10k ohms

Apps and platforms

Arduino Web Editor

Arduino IDE

Project description

Code

Measuring_tape_security_system

arduino

This is the code that makes the Arduino function in the way intended for the project. Upload it using the Arduino web editor, or the Arduino IDE.

1const int trigPin = 2;
2const int echoPin = 3;
3const int LEDlampRed  = 4;
4const int LEDlampYellow = 5;
5const int LEDlampGreen = 6;
6const int  buzzer = 7;
7int sound = 500;
8
9void setup() {
10Serial.begin (9600);
11pinMode(trigPin,  OUTPUT);
12pinMode(echoPin, INPUT);
13pinMode(LEDlampRed, OUTPUT);
14pinMode(LEDlampYellow,  OUTPUT);
15pinMode(LEDlampGreen, OUTPUT);
16pinMode(buzzer, OUTPUT);
17}
18void  loop() {
19long durationindigit, distanceincm;
20digitalWrite(trigPin, LOW);
21delayMicroseconds(2);
22digitalWrite(trigPin,  HIGH);
23delayMicroseconds(10);
24digitalWrite(trigPin, LOW);
25durationindigit  = pulseIn(echoPin, HIGH);
26distanceincm = (durationindigit*0.034) / 2;
27
28if  (distanceincm > 50) {
29digitalWrite(LEDlampGreen, LOW);
30digitalWrite(LEDlampYellow,  LOW);
31digitalWrite(LEDlampRed,LOW);
32noTone(buzzer);
33}
34else if (distanceincm  <= 50 && distanceincm > 20) {
35digitalWrite(LEDlampGreen, HIGH);
36digitalWrite(LEDlampYellow,  LOW);
37digitalWrite(LEDlampRed,LOW);
38noTone(buzzer);
39}
40else if (distanceincm  <= 20 && distanceincm > 5) {
41digitalWrite(LEDlampYellow, HIGH);
42digitalWrite(LEDlampGreen,  HIGH);
43digitalWrite(LEDlampRed,LOW);
44tone(buzzer, 500);
45}
46else if (distanceincm  <= 0) {
47digitalWrite(LEDlampGreen, LOW);
48digitalWrite(LEDlampYellow, HIGH);
49digitalWrite(LEDlampRed,  LOW);
50noTone(buzzer);
51}
52else {
53digitalWrite(LEDlampGreen, HIGH);
54digitalWrite(LEDlampYellow,  HIGH);
55tone(buzzer, 1000);
56digitalWrite(LEDlampRed, HIGH);
57delay(300);
58digitalWrite(LEDlampRed,  LOW);
59}
60
61Serial.print(distanceincm);
62Serial.println(" cm");
63
64delay(300);
65}
66

const int trigPin = 2;
const int echoPin = 3;
const int LEDlampRed  = 4;
const int LEDlampYellow = 5;
const int LEDlampGreen = 6;
const int  buzzer = 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(buzzer, 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*0.034) / 2;

if  (distanceincm > 50) {
digitalWrite(LEDlampGreen, LOW);
digitalWrite(LEDlampYellow,  LOW);
digitalWrite(LEDlampRed,LOW);
noTone(buzzer);
}
else if (distanceincm  <= 50 && distanceincm > 20) {
digitalWrite(LEDlampGreen, HIGH);
digitalWrite(LEDlampYellow,  LOW);
digitalWrite(LEDlampRed,LOW);
noTone(buzzer);
}
else if (distanceincm  <= 20 && distanceincm > 5) {
digitalWrite(LEDlampYellow, HIGH);
digitalWrite(LEDlampGreen,  HIGH);
digitalWrite(LEDlampRed,LOW);
tone(buzzer, 500);
}
else if (distanceincm  <= 0) {
digitalWrite(LEDlampGreen, LOW);
digitalWrite(LEDlampYellow, HIGH);
digitalWrite(LEDlampRed,  LOW);
noTone(buzzer);
}
else {
digitalWrite(LEDlampGreen, HIGH);
digitalWrite(LEDlampYellow,  HIGH);
tone(buzzer, 1000);
digitalWrite(LEDlampRed, HIGH);
delay(300);
digitalWrite(LEDlampRed,  LOW);
}

Serial.print(distanceincm);
Serial.println(" cm");

delay(300);
}

Measuring_tape_security_system

arduino

This is the code that makes the Arduino function in the way intended for the project. Upload it using the Arduino web editor, or the Arduino IDE.

1const int trigPin = 2;
2const int echoPin = 3;
3const int LEDlampRed
4  = 4;
5const int LEDlampYellow = 5;
6const int LEDlampGreen = 6;
7const int
8  buzzer = 7;
9int sound = 500;
10
11void setup() {
12Serial.begin (9600);
13pinMode(trigPin,
14  OUTPUT);
15pinMode(echoPin, INPUT);
16pinMode(LEDlampRed, OUTPUT);
17pinMode(LEDlampYellow,
18  OUTPUT);
19pinMode(LEDlampGreen, OUTPUT);
20pinMode(buzzer, OUTPUT);
21}
22void
23  loop() {
24long durationindigit, distanceincm;
25digitalWrite(trigPin, LOW);
26delayMicroseconds(2);
27digitalWrite(trigPin,
28  HIGH);
29delayMicroseconds(10);
30digitalWrite(trigPin, LOW);
31durationindigit
32  = pulseIn(echoPin, HIGH);
33distanceincm = (durationindigit*0.034) / 2;
34
35if
36  (distanceincm > 50) {
37digitalWrite(LEDlampGreen, LOW);
38digitalWrite(LEDlampYellow,
39  LOW);
40digitalWrite(LEDlampRed,LOW);
41noTone(buzzer);
42}
43else if (distanceincm
44  <= 50 && distanceincm > 20) {
45digitalWrite(LEDlampGreen, HIGH);
46digitalWrite(LEDlampYellow,
47  LOW);
48digitalWrite(LEDlampRed,LOW);
49noTone(buzzer);
50}
51else if (distanceincm
52  <= 20 && distanceincm > 5) {
53digitalWrite(LEDlampYellow, HIGH);
54digitalWrite(LEDlampGreen,
55  HIGH);
56digitalWrite(LEDlampRed,LOW);
57tone(buzzer, 500);
58}
59else if (distanceincm
60  <= 0) {
61digitalWrite(LEDlampGreen, LOW);
62digitalWrite(LEDlampYellow, HIGH);
63digitalWrite(LEDlampRed,
64  LOW);
65noTone(buzzer);
66}
67else {
68digitalWrite(LEDlampGreen, HIGH);
69digitalWrite(LEDlampYellow,
70  HIGH);
71tone(buzzer, 1000);
72digitalWrite(LEDlampRed, HIGH);
73delay(300);
74digitalWrite(LEDlampRed,
75  LOW);
76}
77
78Serial.print(distanceincm);
79Serial.println(" cm");
80
81delay(300);
82}
83

const int trigPin = 2;
const int echoPin = 3;
const int LEDlampRed
  = 4;
const int LEDlampYellow = 5;
const int LEDlampGreen = 6;
const int
  buzzer = 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(buzzer, 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*0.034) / 2;

if
  (distanceincm > 50) {
digitalWrite(LEDlampGreen, LOW);
digitalWrite(LEDlampYellow,
  LOW);
digitalWrite(LEDlampRed,LOW);
noTone(buzzer);
}
else if (distanceincm
  <= 50 && distanceincm > 20) {
digitalWrite(LEDlampGreen, HIGH);
digitalWrite(LEDlampYellow,
  LOW);
digitalWrite(LEDlampRed,LOW);
noTone(buzzer);
}
else if (distanceincm
  <= 20 && distanceincm > 5) {
digitalWrite(LEDlampYellow, HIGH);
digitalWrite(LEDlampGreen,
  HIGH);
digitalWrite(LEDlampRed,LOW);
tone(buzzer, 500);
}
else if (distanceincm
  <= 0) {
digitalWrite(LEDlampGreen, LOW);
digitalWrite(LEDlampYellow, HIGH);
digitalWrite(LEDlampRed,
  LOW);
noTone(buzzer);
}
else {
digitalWrite(LEDlampGreen, HIGH);
digitalWrite(LEDlampYellow,
  HIGH);
tone(buzzer, 1000);
digitalWrite(LEDlampRed, HIGH);
delay(300);
digitalWrite(LEDlampRed,
  LOW);
}

Serial.print(distanceincm);
Serial.println(" cm");

delay(300);
}

Downloadable files

Finished schematic

The Fritzing schematic of the finished circuit

Finished schematic

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MylesBartlett

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