Can Arduino Measure Heights of Tall Buildings?

1/*
2 
3  This project demonstrates how to calculate the
4  heights  of objects using Arduino. Upload
5  this code to your Arduino board and make the
6  necessary connections to start measuring heights.
7 
8  This program is written  by Shreyas for Electronics
9  Champ YouTube Channel. Please subscribe to this
10  channel. Thank you.
11 
12*/
13 
14//including the library
15#include <CheapStepper.h>
16  
17//define the variables
18const int trigPin = 2;
19const int echoPin = 3;
20const  int increment = 7;
21const int decrement = 8;
22bool calibrationMode = false;
23float  angle = 0.00;
24int x = 0;
25 
26//create CheapStepper object
27CheapStepper  stepper(9, 10, 11, 12);
28 
29void setup() {
30 
31  //define the pin modes
32  pinMode(trigPin, OUTPUT);
33  pinMode(echoPin, INPUT);
34  pinMode(increment,  INPUT_PULLUP);
35  pinMode(decrement, INPUT_PULLUP);
36 
37  //start serial communication
38  Serial.begin(9600);
39 
40  //set stepper motor speed
41  stepper.setRpm(20);
42  
43}
44 
45void loop() {
46 
47  if (calibrationMode == false) { //if arduino  is in measurement mode...
48 
49    Serial.println("Arduino is in measurement  mode");
50 
51    while (calibrationMode == false) {
52 
53      while (digitalRead(increment)  == 0 && angle <= 90.00) { //if the 'increment' switch is pressed...
54        stepper.moveCCW(1);  //move the stepper motor
55        delay(10);
56        x++;
57        angle  = x/11.3; //update the angle
58      }
59 
60      while (digitalRead(decrement)  == 0 && angle >= 0.00) { //if the 'decrement' switch is pressed...
61        stepper.moveCW(1);  //move the stepper motor
62        delay(10);
63        x--;
64        angle  = x/11.3; //update the angle
65      }
66 
67      angle = (angle > 90.00) ?  90.00 : angle;
68      angle = (angle < 0.00) ? 0.00 : angle;
69 
70      float  base = getDistance();
71      float tanAngle = tan(((angle > 90.00) ? 90.00 : angle)  * 0.0174533);
72      float height = base * tanAngle;
73 
74      //print the  values on the Serial Monitor
75      Serial.print("Base: ");
76      Serial.print(base);
77      Serial.print("cm      ");
78      Serial.print("Angle: ");
79      Serial.print((angle  > 90.00) ? 90.00 : angle);
80      Serial.print("deg     ");
81      Serial.print("Tan:  ");
82      Serial.print(tanAngle);
83      Serial.print("      ");
84      Serial.print("Height:  ");
85      Serial.print(height);
86      Serial.println("cm");
87      delay(500);
88      checkCalibration();
89     
90    }
91   
92  }
93 
94  else if (calibrationMode  == true) {
95   
96    Serial.println("Set the angle of the motor to 0 degrees  using the switches\
97After that, press both the switches together");
98   
99    while (calibrationMode == true){
100 
101      while (digitalRead(increment)  == 0 && digitalRead(decrement) == 1) {
102        stepper.moveDegreesCCW(1);
103        delay(50);
104      }
105 
106      while (digitalRead(decrement) == 0 &&  digitalRead(increment) == 1) {
107        stepper.moveDegreesCW(1);
108        delay(50);
109      }
110 
111      checkCalibration();
112 
113    }
114 
115    angle = 0;
116    Serial.println("Calibration successful!");
117 
118  }
119 
120}
121 
122//this  function gets the distance between the object and the device
123float getDistance()  {
124 
125  long duration;
126  float distance;
127 
128  digitalWrite(trigPin,  LOW);
129  delayMicroseconds(2);
130  digitalWrite(trigPin, HIGH);
131  delayMicroseconds(10);
132  digitalWrite(trigPin, LOW);
133  duration = pulseIn(echoPin, HIGH);
134  distance  = duration * 0.0343 / 2;
135  return distance;
136 
137}
138 
139 
140//this function  is used to switch modes
141void checkCalibration () {
142 
143  if (digitalRead(increment)  == 0 && digitalRead(decrement) == 0) {
144    delay(1000);
145    calibrationMode  = !calibrationMode;
146  }
147 
148}
149
150