<code c>
//PINS
#define REEDSWITCH 13
#define WHEELSIZE 0.91

volatile unsigned long rotations = 0;
float meter = 0.0;
volatile unsigned long lastactive = 0;

// Debounce Vars
volatile unsigned long last_micros;
unsigned long debouncing_time = 500;              //Debouncing Time in Milliseconds

void setup()
{
  // Reed Sensor (Interrupt) 
  attachInterrupt(digitalPinToInterrupt(REEDSWITCH), debounceInterrupt, FALLING);
  //PINS
  pinMode(REEDSWITCH, INPUT);
  lastactive = millis();
}

void loop()
{ 
  if ( rotations >= 1 && ((millis() - lastactive) >= 1500) ) {
    meter = rotations * WHEELSIZE; 
    // rotations = 0;                      
    // meter = 0;
  }
}

// ----- Helper Functions 
void debounceInterrupt() {
  if ( micros() < last_micros ) {
    last_micros = micros();
  }
  if ((unsigned long)(micros() - last_micros) >= debouncing_time * 1000) {
    rotations++;
    last_micros = micros(); 
    lastactive = millis();
  }
}


#include "DHTesp.h"
DHTesp dht;

void setup()
{
  Serial.begin(115200);
  Serial.println();
  Serial.println("Status\tHumidity (%)\tTemperature (C)\t(F)\tHeatIndex (C)\t(F)");

  dht.setup(12); // data pin 2
}

void loop()
{
  delay(dht.getMinimumSamplingPeriod());

  float humidity = dht.getHumidity();
  float temperature = dht.getTemperature();

  Serial.print(dht.getStatusString());
  Serial.print("\t");
  Serial.print(humidity, 1);
  Serial.print("\t\t");
  Serial.print(temperature, 1);
  Serial.print("\t\t");
  Serial.print(dht.toFahrenheit(temperature), 1);
  Serial.print("\t\t");
  Serial.print(dht.computeHeatIndex(temperature, humidity, false), 1);
  Serial.print("\t\t");
  Serial.println(dht.computeHeatIndex(dht.toFahrenheit(temperature), humidity, true), 1);
}


#include < ESP8266WiFi.h>
#include < WiFiClient.h>
#include < ESP8266WebServer.h>
 
// Replace with your network credentials
const char* ssid = "Your WiFI SSID";
const char* password = "Your WiFI Password";
 
ESP8266WebServer server(80);   //instantiate server at port 80 (http port)
 
String page = "";

void setup(void){
 
  delay(1000);
  Serial.begin(115200);
  WiFi.begin(ssid, password); //begin WiFi connection
  Serial.println("");
  
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  server.on("/", [](){
    page = "ESP8266 Webserver - hello world!";
    server.send(200, "text/html", page);
  });
  
  server.begin();
  Serial.println("Web server started!");
}
 
void loop(void){
  server.handleClient();
} 
</code>