1#define trigPin 2
2#define echoPin 3
3#define LEDlampRed 4
4#define LEDlampYellow 5
5#define LEDlampGreen 6
6#define soundbuzzer 7
7int sound = 500;
8
9
10void setup() {
11 Serial.begin (9600);
12 pinMode(trigPin, OUTPUT);
13 pinMode(echoPin, INPUT);
14 pinMode(LEDlampRed, OUTPUT);
15 pinMode(LEDlampYellow, OUTPUT);
16 pinMode(LEDlampGreen, OUTPUT);
17 pinMode(soundbuzzer, OUTPUT);
18}
19void loop() {
20 long durationindigit, distanceincm;
21 digitalWrite(trigPin, LOW);
22 delayMicroseconds(2);
23 digitalWrite(trigPin, HIGH);
24 delayMicroseconds(10);
25 digitalWrite(trigPin, LOW);
26 durationindigit = pulseIn(echoPin, HIGH);
27 distanceincm = (durationindigit/5) / 29.1;
28
29 if (distanceincm < 50) {
30 digitalWrite(LEDlampGreen, HIGH);
31}
32 else {
33 digitalWrite(LEDlampGreen, LOW);
34 }
35
36 if (distance < 20) {
37 digitalWrite(LEDlampYellow, HIGH);
38}
39 else {
40 digitalWrite(LEDlampYellow,LOW);
41 }
42 if (distance < 5) {
43 digitalWrite(LEDlampRed, HIGH);
44 sound = 1000;
45}
46 else {
47 digitalWrite(LEDlampRed,LOW);
48 }
49
50 if (distanceincm > 5 || distanceinsm <= 0){
51 Serial.println("Outside the permissible range of distances");
52 noTone(soundbuzzer);
53 }
54 else {
55 Serial.print(distance);
56 Serial.println(" cm");
57 tone(buzzer, sound);
58 }
59
60 delay(300);
61}
