//Header files
#include "MQ135.h"

// Variables declaration
int analogPin = 0;
int B = 10;
MQ135 gasSensor = MQ135(analogPin);

//set up macros for wifi and webhost connection //
#define RZERO 310
#define SSID "Base AP" //SSID
#define PASS "12345678"
#define TSKEY "LIKRVX8QU7NVOW02"    // Thingspeak Key
#define IP "184.106.153.149"    // thingspeak.com
#define SENDDELAY 120

 void setup(){
  
  Serial.begin(9600);
  Serial.println("AT");
  delay(5000);
  if(Serial.find("OK")){
     connectWiFi();
  }
}
void loop(){
   
  float PPM = gasSensor.getPPM();
  sendData(String(B), String(PPM));
  delay(120000);
}


void sendData(String batteryLevel ,String ppmSensor ){
  // Set up TCP connection.
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += IP;
  cmd += "\",80";
  Serial.println(cmd);
  delay(2000);
  if(Serial.find("Error")){
    return;
  }

  // Send data.
  cmd = "GET /update?key=";
  cmd += TSKEY;
  cmd += "&field1=";
  cmd += batteryLevel;
  cmd += "&field2=";
  cmd += ppmSensor;
  cmd += "\r\n";
  Serial.print("AT+CIPSEND=");
  Serial.println(cmd.length());
  if(Serial.find(">")){
    Serial.print(cmd);
  }
  else{
    Serial.println("AT+CIPCLOSE");
  }
}
boolean connectWiFi(){
  Serial.println("AT+CWMODE=1");
  delay(2000);
  String cmd="AT+CWJAP=\"";
  cmd+=SSID;
  cmd+="\",\"";
  cmd+=PASS;
  cmd+="\"";
  Serial.println(cmd);
  delay(5000);
  if(Serial.find("OK")){
    return true;
  }
  else{
    return false;
    }
}