String myAPIkey = "OAM1ZJRDAN49H0DX";
#include <SoftwareSerial.h>;
#include <DHT.h>;
SoftwareSerial ESP01(2, 3);
//Constants
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE,22); //// Initialize DHT sensor for normal 16mhz Arduino
float humidity, temp_f;
long writingTimer = 17;
long startTime = 0;
long waitTime = 0;

boolean relay1_st = false; 
boolean relay2_st = false; 
unsigned char check_connection=0;
unsigned char times_check=0;
boolean error;

void setup()
{
  Serial.begin(9600);
  ESP01.begin(9600);
  dht.begin();
  startTime = millis();
  ESP01.println("AT+RST");
  delay(2000);
  Serial.println("Connecting to WiFi");
  while(check_connection==0)
  {
    Serial.print(".");
  ESP01.print("AT+CWJAP=\"Shruti\",\"3205@3205\"\r\n");
  ESP01.setTimeout(5000);
  if(ESP01.find("WiFi Connected\r\n")==1)
  {
    Serial.println("WIFI Connected");
    break;
  }
times_check++;
 if(times_check>3) 
 {
  times_check=0;
   Serial.println("Trying to Reconnect..");
  }
  }
}

void loop()
{
  waitTime = millis()-startTime;   
  if (waitTime > (writingTimer*1000)) 
  {
    readSensors();
    writeThingSpeak();
    startTime = millis();   
  }
}


void readSensors(void)
{
  temp_f = dht.readTemperature();
  humidity = dht.readHumidity();
}


void writeThingSpeak(void)
{
  startThingSpeakCmd();
  // preparacao da string GET
  String getStr = "https://api.thingspeak.com/update?api_key=OAM1ZJRDAN49H0DX&field1=0";
  getStr += myAPIkey;
  getStr +="&field1=";
  getStr += String(temp_f);
  getStr +="&field2=";
  getStr += String(humidity);
  getStr += "\r\n\r\n";
  GetThingspeakcmd(getStr); 
}

void startThingSpeakCmd(void)
{
  ESP01.flush();
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += "184.106.153.149"; // api.thingspeak.com IP address
  cmd += "\",80";
  ESP01.println(cmd);
  Serial.print("Start Commands: ");
  Serial.println(cmd);

  if(ESP01.find("Error"))
  {
    Serial.println("AT+CIPSTART error");
    return;
  }
}

String GetThingspeakcmd(String getStr)
{
  String cmd = "AT+CIPSEND=";
  cmd += String(getStr.length());
  ESP01.println(cmd);
  Serial.println(cmd);

  if(ESP01.find(">"))
  {
    ESP01.print(getStr);
    Serial.println(getStr);
    delay(500);
    String messageBody = "";
    while (ESP01.available()) 
    {
      String line = ESP01.readStringUntil('\n');
      if (line.length() == 1) 
      { 
        messageBody = ESP01.readStringUntil('\n');
      }
    }
    Serial.print("MessageBody received: ");
    Serial.println(messageBody);
    return messageBody;
  }
  else
  {
    ESP01.println("AT+CIPCLOSE");     
    Serial.println("AT+CIPCLOSE"); 
  } 
}