TCP/IP Based IoT Communication with ThingSpeak Platform : IoT Part 29

ESP8266 based TCP-IP Connected ThingSpeak Arduino Temperature Monitor Circuit

###



//Program to 


/*

 * File Name - IR_based_Visitor_counter_and_DHT11_test.ino

 * Created: 2/14/2017 11:02:11 AM

 * Main Source Code for IR based Visior couter and DHT11 test

 * Tested on ATmega328 based Arduino board running on Internal Oscillator at 16MHz

 */ 


 /*

 * Input/Output Pins of the Arduino Baord

 *A5 - OLED SCL pin

 *A4 - OLED SDA pin

 *Tx - ESP8266-01 Rx

 *Rx - ESP8266-01 Tx

 *D2 - IR1 (PERSONIN) output

 *D3 - IR2 (PERSONOUT) output

 *D7 - DHT11 output (pin2)

*/


//Universal graphic Library for Oled(128x64) Dispaly

#include "U8glib.h"   


//DHT11 or DHT22 Temperature sensor Library    

#include "DHT.h"


//Setup u8g object

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0);


//Declare all global variables

const int PersonIn = 2;                   //Variable to hold Incoming Entry of person

const int PersonOut = 3;                  //Variable to hold Outgoing Entry of person 

volatile unsigned int count = 0;          //Variable to hold the count value                                             

int temperature;                         //Variable to hold Temperature

int humidity;                                //Variable to hold Humidity 

String tempC;                               //Variable to hold the character value


char str[10];                              //Array Initialization to hold the String


// DHT11 or DHT22 pin and Type declaration

#define DHTPIN 7                            //DHT11 ouptput connected to Digital Pin 7

#define DHTTYPE DHT11                       //DHT TYPE-DHT 11 or 22

DHT dht(DHTPIN, DHTTYPE);                    //DHTPIN and TYPE declaration


//ESP866-01 WIFI CONNECTION

#define SSID "NOT UR WIFI"                //"SSID-WiFiname" 

#define PASS "marketing"                   //"password"

#define IP "184.106.153.149"           //thingspeak.com ip

String msg = "GET /update?key=03JHV63FG27FYL3R";       //API KEY of our channnel


//Initialise the variable in setup Function

void setup()

{

  Serial.begin(115200);               //Initialise Serial communication at 115200 bps

  Serial.println("AT");              //When baud rate matches, Print AT on Serial Monitor

  delay(5000);


  //Condition to check Whether Serial finds Ok response from ESP8266 or not

  //If It finds Ok response the call the connectWifi() Function 

  if(Serial.find("OK"))

  {

    connectWiFi();

  }


  pinMode(PersonIn, INPUT);               //Initialise the Digital Pin-2 as Input

  pinMode(PersonOut, INPUT);               //Initialise the Digital Pin-3 as Input

  

  attachInterrupt(digitalPinToInterrupt (2), PERSONIN, FALLING);     //Attach Interrupt handler for D2

  attachInterrupt(digitalPinToInterrupt (3), PERSONOUT, FALLING);      //Attach interrupt handler for D3


  //Initialize Timer1 Function

  timer1_init();

                                 

  //Display Welcome messgage on OLED

  OLED_Welcome_Message();                          

}


//Loop function

void loop()

{   

  // check whether the flag bit is set

    // if set, it means that there has been a compare match

    // and the timer has been cleared

    // use this opportunity to update the data on OLED and Thingspeak

  if (TIFR1 & (1 << OCF1A))

  {

    //Get the temperature and Humidity value from DHT11 Sensor

      Temperature_and_Humidity_Test();

  

    //Update the Temperature, Humidity and Total Person on Server(Thingspeak)

      update_Data_To_Server();

  

      //Display the Temperature, Humidity and Total Person on OLED 

      Display_Data_on_OLED();

    }

    // wait! we have one more thing to do

    // clear the flag bit manually since there is no ISR to execute

    // clear it by writing '1' to it (as per the datasheet)

    TIFR1 |= (1 << OCF1A);

}


/*

* Function Name - OLED_Welcome_messgage

* To diplay the text when OLED starts

* Input Paraameter - void

* Return - void

*/

void OLED_Welcome_Message(void) 

{

  u8g_uint_t x = 0;

  u8g_uint_t y = 20;

  const char *s = "VISIOR COUNTER!";

  //Draw the string "VISITOR COUNTER!" on OLED with given reference points

  u8g.firstPage();  

  do

  {

    u8g.setFont(u8g_font_unifont);

    u8g.drawStr( x, y,s );

  } 

  while( u8g.nextPage() );

}


/*

* External Interrupt Function INT0- PERSONIN

* To count the person coming in the room                                                               

*/

void PERSONIN()

{

  count++;

} 


/*

* External Interrupt Function INT1- PERSONOUT()

* To count the person coming out of the room

*/

void PERSONOUT()

{

  count--; 

  if (count <= 0)

  count = 0;

}


/*

*Function Name - Temperature_and_Humidity_Test()  

*Read the Temperature and Humidity value from DHT sensor

*/

void Temperature_and_Humidity_Test()

{

  //Read the Temperature and Humidity from DHT sensor  

  temperature = dht.readTemperature();

  humidity = dht.readHumidity();

  char buffer[10];


  //There is a useful c function called dtostrf() which will convert a float to a char array so it 
can then be printed easily.  

  //The format is: dtostrf(floatvar, StringLengthIncDecimalPoint, numVarsAfterDecimal, charbuf);

  tempC = dtostrf(temperature, 4, 1, buffer); 

}


/*

*Function Name= Display_Data_on_OLED()

*To display the data on OLED with paticular format

*/

void Display_Data_on_OLED()

{

  //To Display on OLED

  u8g.firstPage();  

  do

  {

    //Set the font of display

    u8g.setFont(u8g_font_helvB08);

    

    //Draw the string "Total Person" with specified reference points(x,y)

    u8g.drawStr( 0, 15, "TOTAL Person:");

    //set the count value to OLED specied points

    u8g.drawStr( 80, 15, dtostrf(count, 5, 2, str));


    //Draw the string "Humidity" with specified reference points(x,y)

    u8g.drawStr( 0, 30, "Humidity:");

    //set the Humidity value to OLED specied points

    u8g.drawStr( 80, 30, dtostrf(humidity, 5, 2, str));

    u8g.drawStr( 120, 30, "%");

    

    //Draw the string "Temperature" with specified reference points(x,y)

    u8g.drawStr( 0, 45, "Temperature:");

    //set the Temperature value to OLED specied points

    u8g.drawStr( 80, 45, dtostrf(temperature, 5, 2, str));

    u8g.drawStr( 120, 45, "260C");

  } 

  while( u8g.nextPage() );

}


/*

* Function Name- update_Data_To_Server()

* Establish TCP connection and send the updated Data to Server(Thingspeak)

*/

void update_Data_To_Server()

{

   //Specify which connection channel you wish to connect on ( 0 - 4 ), 

   //the protocol type (TCP/UDP),the IP address (or domain if you have DNS access) 

   //and the port number using the CIPSTART command:

   String cmd = "AT+CIPSTART="TCP","";

   cmd += IP;

   cmd += "",80";

   Serial.println(cmd);

   

   if(Serial.find("Error"))

    {

      return;

    }


   cmd = msg ;

   cmd += "&field1=";                    //Creates field1 for Total Person in the Room 

   cmd += String(count);                  //Upload count data to thingspeak

   cmd += "&field2=";                  //Creates field2 for Temperature

   cmd += tempC;                        //Upload Temperature data to Thingspeak

   cmd += "&field3=";                       //Creates field3 for Humidity

   cmd += String(humidity);              //Upload Humidity data to Thingpeak

   cmd += "rnrn";


   //Send Data Length

   Serial.print("AT+CIPSEND=");

   Serial.println(cmd.length());


   //If Everything works ok, then we get ">"

   if(Serial.find(">"))

   {

     //Serial monitor prints the Get command with the API key and fields speacified

     Serial.print(cmd);

   }

   else

   {

    //close the TCP connection

     Serial.println("AT+CIPCLOSE");

     Temperature_and_Humidity_Test();

     count;

   }

}


/*

*Function Name- connectWifi()

*It establishes the connection between the ESP8266 and Wifi

*Input paramerter-void

*Return type- boolean 

*/

boolean connectWiFi()

{

   //Enable the module to act as both Station and an access point 

   Serial.println("AT+CWMODE=1");

   delay(2000);

   

   //Join the WIFI access point

   String cmd="AT+CWJAP="";

   cmd+=SSID;

   cmd+="","";

   cmd+=PASS;

   cmd+=""";

   

   //Print the Wifi SSID and Password on Serial monitor

   Serial.println(cmd);

   delay(5000);

   

   if(Serial.find("OK"))

   { 

     return true;

   }

   else

   {

     return false;

   }

}


/*

*Function Name- timer1_init()

Timer1(16bit) creates the delay time period

in order to display the data on OLED and Server(Thingpeak)

*/

void timer1_init()

{

   //Initialize registers 

   TCCR1A = 0;                //set entire TCCR1A register to 0

   TCCR1B = 0;                   //set entire TCCR1B register to 0

  

   //Initialize counter

   TCNT1 = 0;

   

   // Set the Compare value equal to count_value_for_Delay_time that

   // was calculated for generating a Delay Time period 

   // This updates the temperature, Humidity and Total person after every Delay Time Period

   OCR1A = 46874;

    

  //Start timer1                                                                                       

   //Set up timer with prescaler = 1024 and CTC mode

   TCCR1B |= (1 << WGM12)|(1 << CS12)|(1 << CS10);    

}


###