Final prototype.txt

#include <SoftwareSerial.h>


// We Created software serial object to communicate with SIM800L
SoftwareSerial mySerial(3, 2); //SIM800L Tx & Rx is connected to Arduino #3 & #2

int analogSensor;
int blueLed = 13;
int buzzer = 10;
int smokeA0 = A0;
// our threshold value
int sensorThres = 300;

void setup() {
  pinMode(blueLed, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(smokeA0, INPUT);
  Serial.begin(9600);
  mySerial.begin(9600);
   Serial.println(" | GAS AND SMOKE DETECTOR!");


   
}

void loop() {
  analogSensor = analogRead(smokeA0);

  Serial.print("Sensor Value: ");
  Serial.print(analogSensor);
  // Checks if it has reached greater than threshold value
  if (analogSensor > sensorThres)
  {
    digitalWrite(blueLed, HIGH);
    
     Serial.println(" | Smoke detected!");
    tone(buzzer, 1000, 500);
    
Serial.println("Initializing..."); 
  
      tosend();
      field1(analogSensor);
      Endconnection();
  mySerial.println("ATD+ +256 0703729340;"); //  change ZZ with country code and xxxxxxxxxxx with phone number to dial
  updateSerial();
  delay(20000); // wait for 20 seconds...
  mySerial.println("ATH"); //hang up
  updateSerial();
  
    delay(8000);
     }
  else
  { Serial.println();
    digitalWrite(blueLed, LOW);
    noTone(buzzer);
  }
  delay(1000);
}
void tosend(){
  
mySerial.println("AT"); //Once the handshake test is successful, i t will back to OK
delay(200);

mySerial.println("AT+CSQ"); //Signal quality test, value range is 0-31 , 31 is the best
  delay(200);
  
  mySerial.println("AT+CCID"); //Read SIM information to confirm whether the SIM is plugged
  delay(200);
  
mySerial.println("AT+CPIN?");
delay(200);

mySerial.println("AT+CBC");
delay(200);


mySerial.println("AT+CREG?");
delay(200);


mySerial.println("AT+CGATT?");
delay(200);

mySerial.println("AT+CIPSHUT");
delay(200);

mySerial.println("AT+CIPSTATUS");
delay(1000);

mySerial.println("AT+CIPMUX=0 ");
delay(1000);
updateSerial();

mySerial.println("AT+CSTT=\"MTN-UGANDA\",\"MTN-INTERNET\",""");
delay(200);
updateSerial();

mySerial.println("AT+CIICR");//start wireless connection cellular network
delay(2000);
updateSerial();

mySerial.println("AT+CIFSR");//enquire regarding the IP address allocated
delay(2000);
updateSerial();

mySerial.println("AT+CIPSTART=\"TCP\",\"184.106.153.149\",\"80\"");//connect to the ThingSpeak update URL (https://api.thingspeak.com)
updateSerial();

/*Serial.println("WRITE CIPSTART: ");
String command = Serial.readString();
while(Serial.available())
{
  
}
updateSerial();*/

mySerial.println();
mySerial.println("AT+CIPSEND=44");//declare the number of bytes (characters) I want to send
updateSerial();

  }
  void field1(int analogSensor){
    String str = "GET update?api_key=K4VC7OLCPPRV89GW&field1=" + String (analogSensor);
    mySerial.println(str);//this is a constant beginning for the GET command and is as provided by ThingSpeak
    delay(4000);
updateSerial();
mySerial.println((char)26);
delay(4000);
updateSerial();
mySerial.println();
    }
    void Endconnection() {
mySerial.println("AT+CIPSHUT");
delay(200); 
updateSerial();     
      }
void updateSerial()
{
  delay(2500);
  while (Serial.available()) 
  {
    mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port
  }
  while(mySerial.available()) 
  {
    Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port
  }
}