IoT based Coffee Management System(CMS)

/*
This sketch is a combination of ADAFruits DHT sketch, WiFi101 Webclient,I2C connection to Rasberry pi2,pressure pad SEN-09376-10kg
and The arduino example from ThingSpeak
Modified by Sanyam Mehta for the MKR1000, feel free to use
 */


#include <SPI.h>
#include <WiFi101.h>
#include <Wire.h>  
#include "DHT.h"

#define DHTPIN 1  // what pin DHT data line is connected to, pin1 is 5th pin from end
 #define SLAVE_ADDRESS 0x40   // Define the i2c address
// Uncomment whatever DHT sensor type you're using!
#define DHTTYPE DHT11  // DHT 11
//#define DHTTYPE DHT21  // DHT 21
//#define DHTTYPE DHT22  // DHT 22

DHT dht(DHTPIN,DHTTYPE);
// Local Network Settings
char ssid[] = "your SSID key";  // your network SSID (name)
char pass[] = "password?";    // your network password
int keyIndex = 0;             // your network key Index number (needed only for WEP)

int pressure_temp;




// ThingSpeak Settings
int status = WL_IDLE_STATUS;
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)

char thingSpeakAddress[] = "api.thingspeak.com";  // name address for Google (using DNS)
String APIKey = "Your API key";             // enter your channel's Write API Key

// Variable Setup
long lastConnectionTime = 0;
boolean lastConnected = false;

// Initialize Arduino Ethernet Client
WiFiClient client;

void setup() {
  // Start Slave address for sending pressure value of the cup
 
  Wire.begin(SLAVE_ADDRESS); 
  

  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
   
    //WiFi shield not present don't continue:
    while (true);
  }

  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) {
   //Attempting to connect to SSID

    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:
    delay(10000);
  }
//Connected to wifi
  
}

void loop() {
  
  // Wait a few seconds between measurements.
   delay(2000);
  // read values from pins and store as strings
   int h = dht.readHumidity();
  // Read temperature as Celsius (the default)
   int t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
   int f = dht.readTemperature(true);
  //read values for pressure pads connected to 
  pressure_temp = analogRead(A0); // read pressure value of water
  String p = String(pressure_temp,DEC);
int   pressure_temp_machine = analogRead(A1); // read pressure value of coffee machine
  String pmachine = String(pressure_temp_machine,DEC);
  Wire.onRequest(sendData); // this will be sent through I2C
  // Check if any reads failed and exit early (to try again).
  if (isnan(h) || isnan(t) || isnan(f))
  {
   //Failed to read from DHT sensor!
    return;
  }

  // Compute heat index in Fahrenheit (the default)
  int hif = dht.computeHeatIndex(f, h);
  // Compute heat index in Celsius (isFahreheit = false)
  int hic = dht.computeHeatIndex(t, h, false);

 
 

  
//Starting connection to server...
  // if you get a connection, report back via serial:
  if (client.connect(thingSpeakAddress, 80)) {
   //connected to server


          client.print(F("POST "));
          client.print("/update?key=apiKey&field1=" 
          +               (String) h
          +  "&field2=" +(String) t
          +  "&field3=" +(String) f
           +  "&field4=" + p
          +  "&field5=" +(String) hic
          +  "&field6=" +(String) hif
          +  "&field7=" +pmachine  );
                                      
          String tsData = "field1="   //need the length to give to ThingSpeak
          +             (String)  h
          +  "&field2=" +(String) t
          +  "&field3=" +(String) f
           +  "&field4=" + p
          +  "&field5=" +(String) hic
          +  "&field6=" +(String) hif
           +  "&field7=" +pmachine; 


          client.print("POST /update HTTP/1.1\n");  
          client.print("Host: api.thingspeak.com\n");
          client.print("Connection: close\n");
          client.print("X-THINGSPEAKAPIKEY: " + APIKey + "\n");
          client.print("Content-Type: application/x-www-form-urlencoded\n");
          client.print("Content-Length: ");
          client.print(tsData.length());  //send out data string legth to ts
          client.print("\n\n");
          client.print(tsData);
          client.stop();
          delay(1000);
    } 

}



void sendData()

{
//data sent to raspberry pi2 
 Wire.write(pressure_temp); 


}