Instant Human Height Detector Gadget

1// Instant Human Height Detector Gadget
2//created by aarav_barnwal
3//created  on 29th May 2020
4
5#include <LiquidCrystal.h>;
6LiquidCrystal lcd(12, 11,  5, 4, 3, 2);
7#define echoPin 8
8#define trigPin 9
9
10long duration;
11int  height;
12
13void setup() {
14  pinMode(trigPin,OUTPUT);
15  pinMode(echoPin,INPUT);
16  
17  lcd.begin(16, 1);
18  
19  lcd.println("Calculating...  ");
20  }
21
22void  loop() {
23  digitalWrite(trigPin,LOW);
24  delayMicroseconds(2);
25  digitalWrite(trigPin,HIGH);
26  delayMicroseconds(10);
27  digitalWrite(trigPin,LOW);
28
29  duration = pulseIn(echoPin,HIGH);
30
31  delay(200);
32
33  height =  182.88 - ((duration * 0.034) / 2);
34
35  if(height  < 0)
36    height = 100;
37
38  lcd.println("   Height:");
39  if(height <  10)
40    lcd.print("  ");
41  if(height < 100 & height >= 10)
42    lcd.print("  ");
43  
44  lcd.print(height);
45  lcd.print(" cm  ");
46  delay(250);
47  
48
49
50}