Esp8266 Radar system (IOT)

//for more project visit www.blackkeyhole.com
//crafted by Ashshak Sharifdeen
#include <ESP8266WiFi.h>
#include "HTTPSRedirect.h"
#include "DebugMacros.h"
#include <Servo.h> 

const int trigPin = 5;
const int echoPin = 4;

//Defines piezo pin
const int piezoPin = D0;
Servo myServo;
int notes[] = {262, 462, 862, 1662, 3262}; // Enter here the notes you like

// Variables for the duration and the distance
long duration;
float distance;




float a;
float d;
String sheetrange = "";
String sheetDistance = "";

const char* ssid = "ZTE WIFI";                //replace with our wifi ssid
const char* password = "kl2229834";         //replace with your wifi password

const char* host = "script.google.com";
const char *GScriptId = "AKfycbyE_jloJgKB4McUYy_gLPHsCI6hTh5mqdCIaLYIS3lJXRmAqwc"; // Replace with your own google script id
const int httpsPort = 443; //the https port is same

// echo | openssl s_client -connect script.google.com:443 |& openssl x509 -fingerprint -noout
const char* fingerprint = "";

//const uint8_t fingerprint[20] = {};

String url = String("/macros/s/") + GScriptId + "/exec?value=Distance";  // Write Teperature to Google Spreadsheet at cell A1
// Fetch Google Calendar events for 1 week ahead
String url2 = String("/macros/s/") + GScriptId + "/exec?cal";  // Write to Cell A continuosly

//replace with sheet name not with spreadsheet file name taken from google
String payload_base =  "{\"command\": \"appendRow\", \
                    \"sheet_name\": \"TempSheet\", \
                       \"values\": ";
String payload = "";

HTTPSRedirect* client = nullptr;

// used to store the values of free stack and heap before the HTTPSRedirect object is instantiated
// so that they can be written to Google sheets upon instantiation

void setup() {

  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  
  myServo.attach(14);
  
  Serial.begin(115200);
      

  Serial.println();
  Serial.print("Connecting to wifi: ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  // Use HTTPSRedirect class to create a new TLS connection
  client = new HTTPSRedirect(httpsPort);
  client->setInsecure();
  client->setPrintResponseBody(true);
  client->setContentTypeHeader("application/json");
  Serial.print("Connecting to ");
  Serial.println(host);          //try to connect with "script.google.com"

  // Try to connect for a maximum of 5 times then exit
  bool flag = false;
  for (int i = 0; i < 5; i++) {
    int retval = client->connect(host, httpsPort);
    if (retval == 1) {
      flag = true;
      break;
    }
    else
      Serial.println("Connection failed. Retrying...");
  }

  if (!flag) {
    Serial.print("Could not connect to server: ");
    Serial.println(host);
    Serial.println("Exiting...");
    return;
  }
// Finish setup() function in 1s since it will fire watchdog timer and will reset the chip.
//So avoid too many requests in setup()

  Serial.println("\nWrite into cell 'A1'");
  Serial.println("------>");
  // fetch spreadsheet data
  client->GET(url, host);
  
  Serial.println("\nGET: Fetch Google Calendar Data:");
  Serial.println("------>");
  // fetch spreadsheet data
  client->GET(url2, host);

 Serial.println("\nStart Sending Sensor Data to Google Spreadsheet");

  
  // delete HTTPSRedirect object
  delete client;
  client = nullptr;
}

void loop() {

 for(a=15;a<=165;a++){  
  myServo.write(a);

  distance = calculateDistance();// Calls a function for calculating the distance measured by the Ultrasonic sensor for each degree
  
  //beep sequence
  if(distance > 40){
    noTone(piezoPin);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else if (distance <= 40 && distance > 30){
    tone(piezoPin, notes[1]);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else if (distance <= 30 && distance > 20){
    tone(piezoPin,notes[2]);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else if (distance <= 20 && distance > 10){
    tone(piezoPin,notes[3]);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else {
    tone(piezoPin,notes[4]);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
     
      
  Serial.print(a); // Sends the current degree into the Serial Port
  Serial.print(","); // Sends addition character right next to the previous value needed later in the Processing IDE for indexing
  Serial.print(distance); // Sends the distance value into the Serial Port
  Serial.print("."); // Sends addition character right next to the previous value needed later in the Processing IDE for indexing

  sheetrange = String(a) + String("");;                                         
  sheetDistance = String(distance) + String("cm");

  payload = payload_base + "\"" + sheetDistance + "," + sheetrange + "\"}";

  Serial.println("POST or SEND Sensor data to Google Spreadsheet:"); //switch to add
  if (client->POST(url2, host, payload)) {
    ;
  }

  
  }
  // Repeats the previous lines from 165 to 15 degrees
  for(float a=165;a>15;a--){  
  myServo.write(a);
 
  float distance = calculateDistance();
  if(distance > 40){
    noTone(piezoPin);
    delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else if (distance <= 40 && distance > 30){
    tone(piezoPin, notes[1]);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else if (distance <= 30 && distance > 20){
    tone(piezoPin,notes[2]);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else if (distance <= 20 && distance > 10){
    tone(piezoPin,notes[3]);
     delay(10);
    noTone(piezoPin);
    delay(30);
  }
  else {
    tone(piezoPin,notes[4]);
    delay(10);
    noTone(piezoPin);
    delay(30);
  }
     
  Serial.print(a);
  Serial.print(",");
  Serial.print(distance);
  Serial.print(".");

  sheetrange = String(a) + String("");;                                         
  sheetDistance = String(distance) + String("cm");

  payload = payload_base + "\"" + sheetDistance + "," + sheetrange + "\"}";

  Serial.println("POST or SEND Sensor data to Google Spreadsheet:"); //switch to add
  if (client->POST(url2, host, payload)) {
    ;
  }

  }  
  
}



int calculateDistance(){ 
  
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH); 
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH); // Reads the echoPin, returns the sound wave travel time in microseconds
  //U(m/s)=dX(m)/dT(s) 
  //in this case Duration(time)= 2*Distance/SpeedOfSound=> 
  //Distance=SpeedOfSound*Duration/2
  // In dry air at 20 C, the speed of sound is 343.2 m/s or 0.003432 m/Microsecond or 0,03434 cm/Microseconds
  distance= duration*0.034/2; 
  return distance;
}