WiFi Person Counter Arduino Code

/*********
  Original Code By: Rui Santos
  Modified By: skywired
*********/
#include <ESP8266WiFi.h>
int personsCounted = 0;
// Replace with your network credentials
const char* ssid     = "YOUR SSID";
const char* password = "YOUR PASSWORD";
int x = 0;
// Set web server port number to 80
WiFiServer server(80);




String header;
bool led = false;
const int trigPin = 4;
const int echoPin = 5;




long duration;
int distance;
int calDistance = 0;//Don't change
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;


void setup() {
  pinMode(12, OUTPUT);//Declaring GPIO 12 as an output (connects to LED)


  analogWrite(12, 3);//Write LED to 3 with PWM


  Serial.begin(9600); // Starts the serial communication




  //******************************************************
  //This code is used to start the web server
  //******************************************************


  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);


  WiFi.begin(ssid, password);


  while (WiFi.status() != WL_CONNECTED) {
    delay(500);//Wait .5 seconds before trying again to connect. This may take a few tries
    Serial.print(".");
  }


  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());//REMEMBER THIS IP ADDRESS! YOU WILL NEED TO USE IT TO CONNECT TO IT!


  server.begin();//Start the server


  analogWrite(12, 0);//Turn the LED off


  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input


}




void loop() {


  //******************************************************
  // This code is for calculating distance on the HC-SR04
  //******************************************************
  // Clears the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);


  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);


  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);


  // Calculating the distance
  distance = duration * 0.034 / 2;










  //******************************************************
  //This code detects if a user has connected to the ESP
  //******************************************************
  WiFiClient client = server.available();   // Listen for incoming clients


  if (client) {                             // If a new client connects,
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    currentTime = millis();
    previousTime = currentTime;
    while (client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
      currentTime = millis();
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();




            if (header.indexOf("GET /update") >= 0) {
              Serial.println("Update");


            } else if (header.indexOf("GET /reset") >= 0) {


              Serial.println("Reset");
              personsCounted = 0;




            } else if (header.indexOf("GET /calibrate") >= 0) {
              digitalWrite(12, HIGH);
              Serial.println("calibrating!");
              digitalWrite(trigPin, LOW);
              delayMicroseconds(2);


              // Sets the trigPin on HIGH state for 10 micro seconds
              digitalWrite(trigPin, HIGH);
              delayMicroseconds(10);
              digitalWrite(trigPin, LOW);


              // Reads the echoPin, returns the sound wave travel time in microseconds
              duration = pulseIn(echoPin, HIGH);


              // Calculating the distance
              calDistance = duration * 0.034 / 2;
              calDistance = calDistance - 7;
              delay(1000);
              digitalWrite(12, LOW);
            }


            //******************************************************
            //This code is for making the website the ESP is hoting.
            //******************************************************


            //This is HTML code. You can modify it to your taste if you know what you are doing, but no modifications are required.


            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");
            client.println("<script>");
            client.println("function cal() {");
            client.println("alert('Calibrated!');");
            client.println("");


            client.println("}");
            client.println("</script>");
            // CSS to style the on/off buttons
            // Feel free to change the background-color and font-size attributes to fit your preferences
            client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto;}");
            client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
            client.println(".button2 {background-color: #77878A;}</style></head>");
            client.println("<body><br><center><u><h1>ESP8266 Person Counter Control Panel</h1></u>");
            client.println("<br>");
            client.println("<br>");
            client.println("<h2>People Counted:</h2>");
            client.println("<br>");
            client.println("<h1>");
            client.println(personsCounted);
            client.println("</h1>");
            client.println("<br>");
            client.println("<br>");
            client.println("<br>");
            client.println("<br>");
            client.println("<p><a href=\"/reset\"><button class=\"button\">Reset Counter</button></a></p>");
            client.println("<p><a href=\"/update\"><button class=\"button button2\">Update Counter</button></a></p>");
            client.print("<p><a href=\"/calibrate\" id = \"calibrateButton\" onclick =\"cal()\"><button  class=\"button button2\">Calibrate Sensor</button></a></p>&nbsp;&nbsp;&nbsp;<br><p>Sensor Threshold: ");
            client.print(calDistance);
            client.println("</p>");
            client.println("<h3><a href=\"https://docs.google.com/presentation/d/1rl4b2HUcnA15HfbJAZuuupapFs2aXjrh8gPIO-D9RYU/present?slide=id.g14906e2b0e6_4_0\">Help and Instructions</a><h3>");
            client.println("</center></body></html>");
            client.println();


            // Break out of the while loop
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }


  //******************************************************
  //This code is for detecting people an flashing the LED
  //******************************************************
  delay(1);//Wait 1 ms


  x++;//Increase the variable 'X' by one every 1 ms






  if (x == 350 || x == 351 || x == 352 || x == 353 || x == 354 || x == 355 && led == false) {
    digitalWrite(12, HIGH);
    //Turn LED on for a bit WITHOUT pausing the program using delays
    led = true;//sets the boolean to true
  }


  //Serial.println(calDistance);
  if (x > 350) {
    digitalWrite(12, LOW);
    x = 0;//Sets the light flash variable to 0 again
    //Turn LED off for a bit WITHOUT pausing the program using delays
    led = false;//sets the boolean to false
  }
  if (calDistance > 1180) {
    calDistance = 60;
    client.println("<!DOCTYPE html><html>");
    client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
    client.println("<link rel=\"icon\" href=\"data:,\">");
    client.println("<script>");
    client.println("function cal() {");
    client.println("alert('calibrated!');");
    client.println("}");
    client.println("</script>");
    // CSS to style the buttons
    // Feel free to change the background-color and font-size attributes to fit your preferences
    client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto;}");
    client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
    client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
    client.println(".button2 {background-color: #77878A;}</style></head>");
    client.println("<body><br><center><u><h1>ESP8266 Person Counter Control Panel</h1></u>");
    client.println("<br>");
    client.println("<br>");
    client.println("<h2>People Counted:</h2>");
    client.println("<br>");
    client.println("<h1>");
    client.println(personsCounted);
    client.println("</h1>");
    client.println("<br>");
    client.println("<br>");
    client.println("<br>");
    client.println("<br>");
    client.println("<p><a href=\"/reset\"><button class=\"button\">Reset Counter</button></a></p>");
    client.println("<p><a href=\"/update\"><button class=\"button button2\">Update Counter</button></a></p>");
    client.print("<p><a href=\"/calibrate\" onclick =\"cal()\"><button class=\"button button2\">Calibrate Sensor</button></a></p>&nbsp;&nbsp;&nbsp;<br><p>Sensor Threshold: ");
    client.print("Distance is INVALID! (Over 1180cm / limit) Please adjust! [Reset sensor threshold to deault, 60cm]");
    client.println("</p>");
    client.println("<h3><a href=\"https://docs.google.com/presentation/d/1rl4b2HUcnA15HfbJAZuuupapFs2aXjrh8gPIO-D9RYU/present?slide=id.g14906e2b0e6_4_0\">Help and Instructions</a><h3>");
    client.println("</center></body></html>");
    client.println();
  }
  if ( distance < calDistance && calDistance != 0) {
    personsCounted++;//Increase the amount of people counted by one
    digitalWrite(12, HIGH);//Turn on LED
    while (distance < calDistance && calDistance != 0) {
      delay(550);//Wait until person has passed.
      // Clears the trigPin
      digitalWrite(trigPin, LOW);
      delayMicroseconds(2);


      // Sets the trigPin on HIGH state for 10 micro seconds
      digitalWrite(trigPin, HIGH);
      delayMicroseconds(10);
      digitalWrite(trigPin, LOW);


      // Reads the echoPin, returns the sound wave travel time in microseconds
      duration = pulseIn(echoPin, HIGH);


      // Calculating the distance
      distance = duration * 0.034 / 2;
    }
    digitalWrite(12, LOW);
  }
  if (calDistance == 0) {
    for (int fadeValue = 0 ; fadeValue <= 150; fadeValue += 5) {
      // sets the value (range from 0 to 255):
      analogWrite(12, fadeValue);
      // wait for 30 milliseconds to see the dimming effect
      delay(30);
    }
    delay(500);
    // fade out from max to min in increments of 5 points:
    for (int fadeValue = 150 ; fadeValue >= 0; fadeValue -= 5) {
      // sets the value (range from 0 to 255):
      analogWrite(12, fadeValue);
      // wait for 30 milliseconds to see the dimming effect
      delay(30);
    }
    delay(500);
  }


}