The idea

• IoT based Live Weather Station Monitoring Using Arduino + ESP. We will interface DHT11 Humidity & Temperature Sensor, BMP180 Barometric Pressure Sensor,FC37 Rain Sensor and wind speed. I design simple sensor for wind speed using hall effect and magnet. The magnet stands on a bearing when the magnet rotates in a circular way, it passes over the hall effect sensor and we calculate this transition and find the circular speed, then we convert this speed to rpm. We will measure humidity, temperature, Barometric pressure and rainfall, wind speed and upload the data to a web server.

The process

The design

Wind speed sensor

Radiation Shield Specification

#include <SoftwareSerial.h>                                
#include <DHT.h>                                          
#include <Wire.h>
#include <Adafruit_BMP085.h>

String wifiName = "			";                 //Wifi Name   
String wifiPass = "			";           //Wifi Password

int rainPin = A0;
int thresholdValue = 500;
int rxPin = 0;                                               //ESP8266 RX pin
int txPin = 1;                                               //ESP8266 TX pin
int hall_pin = 3;
float hall_thresh = 10;

#define DHTPIN 2              //DHT Pin
#define DHTTYPE DHT11           //DHT Sensor Type
DHT DHT1_1(DHTPIN, DHTTYPE);       //DHT11 Object
Adafruit_BMP085 bmp;          //BMP085 Object

String ip = "184.106.153.149";          //Thingspeak ip adrress
SoftwareSerial esp(rxPin, txPin);       //Serial Communication pin

void setup() 
{
  Wire.begin();  
  DHT1_1.begin();
  bmp.begin();
  pinMode(rainPin, INPUT);
  Serial.begin(9600);             //Serial communication starts
  pinMode(hall_pin, INPUT);
  Serial.println("Started");
  esp.begin(115200);                                          //ESP8266 communication start
  esp.println("AT");                                          //AT command for test
  Serial.println("AT Sent");
  while(!esp.find("OK"))
  {                                     
    esp.println("AT");
    Serial.println("ESP8266 Not Found.");
  }
  Serial.println("OK");
  esp.println("AT+CWMODE=1");                                 //setting the ESP8266 module to client.
  while(!esp.find("OK")){                                     //waiting until the adjustment is made.
    esp.println("AT+CWMODE=1");
    Serial.println("Setting Up....");
  }
  Serial.println("Set as Client");
  Serial.println("Connecting to network...");
  esp.println("AT+CWJAP=\\""+wifiName+"\\",\\""+wifiPass+"\\"");    //connecting to our network.
  while(!esp.find("OK"));                                     //Waiting until we're connected to the network.
  Serial.println("Connected.");
  delay(100);
}
void loop() 
{
  esp.println("AT+CIPSTART=\\"TCP\\",\\""+ip+"\\",80");           //Connection Thingspeak
  if(esp.find("Error")){                                      //checking for connection error.
    Serial.println("AT+CIPSTART Error");
  }
   
  float hall_count = 1;
  float start = micros();
  bool on_state = false;
  while(hall_count <= 5){
    if (digitalRead(hall_pin)==0){
      if (on_state==false){
        on_state = true;
        hall_count+=1;
      }
    } else{
      on_state = false;
    }
    
  }
  int sensorValue = analogRead(rainPin);
  if(sensorValue < thresholdValue){
    sensorValue = 1;
   }
  else {
    sensorValue = 0;
      }
  
  
  float end_time = micros();
  float time_passed = ((end_time-start)/1000000.0);
  float rpm_val = (hall_count/time_passed)*60.0;
  
  float temperature = DHT1_1.readTemperature();
  float humidity = DHT1_1.readHumidity();
  float temperature2 = bmp.readTemperature();
  float pressure = bmp.readPressure();
  float altitude = bmp.readAltitude();

  
  String data = "GET <https://api.thingspeak.com/update?api_key=6FAYRI8LS16OPDNQ>";    //Thingspeak command. Instead of xxxxx, we write our own api keynote in Key.                                
  data += "&field1=";
  data += String(temperature);
  data += "&field2=";
  data += String(humidity);                                       
  data += "&field3=";
  data += String(temperature2);
  data += "&field4=";
  data += String(pressure);
  data += "&field5=";
  data += String(altitude);
  data += "&field6=";
  data += String(sensorValue);
  data += "&field7=";
  data += String(rpm_val);

  
  data += "\\r\\n\\r\\n"; 
  esp.print("AT+CIPSEND=");                                   
  esp.println(data.length()+10);
  delay(1000);
  if(esp.find(">"))
  {                                          
    esp.print(data);                                        
    Serial.println(data);
    Serial.println("data sent.");
    delay(1000);
  }
                                             
}