SIM GSM

/*
  #include <SoftwareSerial.h>
  SoftwareSerial SIM900A(2,3); // RX | TX
  // Connect the SIM900A TX to Arduino pin 2 RX.
  // Connect the SIM900A RX to Arduino pin 3 TX.
  char c = ' ';
  void setup()
  {
  // start th serial communication with the host computer
  Serial.begin(9600);
  while(!Serial);
  Serial.println("Arduino with SIM900A is ready");

  // start communication with the SIM900A in 9600
  SIM900A.begin(9600);
  Serial.println("SIM900A started at 9600");
  delay(1000);
  Serial.println("Setup Complete! SIM900A is Ready!");
  }

  void loop()
  {

  // Keep reading from SIM800 and send to Arduino Serial Monitor
  if (SIM900A.available())
  { c = SIM900A.read();
  Serial.write(c);}

  // Keep reading from Arduino Serial Monitor and send to SIM900A
  if (Serial.available())
  { c = Serial.read();
  SIM900A.write(c);
  }

  }

*/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);
SoftwareSerial SIM900A(10, 11);
int analogValue;
int LED_Pin = 13;             // Set up the LED indicator
int Sound_Pin = A0;
int t = 548 ;

void setup()
{
  SIM900A.begin(9600);   // Setting the baud rate of GSM Module
  Serial.begin(9600);    // Setting the baud rate of Serial Monitor (Arduino)
  Serial.println ("SIM900A Ready");
  delay(100);
  Serial.println ("Type s to send message or r to receive message");
  pinMode(LED_Pin, OUTPUT);
  SendMessage();
  lcd.begin();
  lcd.backlight();
  lcd.clear();
}
void loop()
{
  analogValue = analogRead(Sound_Pin);
  Serial.println(analogValue);
  lcd.setCursor(3, 0);
  lcd.print("Sound level ");
  lcd.setCursor(8, 1);
  lcd.print(analogValue);
  delay(50);

  if (analogValue > t)         // If higher than 8 is returned, then change state of boolean "toggle" to true, display analogValue to serial monitor and wait 200ms.
    // The higher the value in the above "if" statement, the less sensitive your clapper will be.  Use the serial monitor to calibrate to your wanted sensitivity =D
  {
    SendMessage();
    Serial.println(analogValue);
    delay(200);
  }

}
void SendMessage()
{
  Serial.println ("Sending Message");
  SIM900A.println("AT+CMGF=1");    //Sets the GSM Module in Text Mode
  delay(1000);
  Serial.println ("Set SMS Number");
  SIM900A.println("AT+CMGS=\"+966554418546\"\r"); //Mobile phone number to send message
  //540538259 SAFWAN 2
  //554418546 SAFWAN 1
  delay(1000);
  Serial.println ("Set SMS Content");
  SIM900A.println("Be quiet");// Messsage content
  delay(100);
  Serial.println ("Finish");
  SIM900A.println((char)26);// ASCII code of CTRL+Z
  delay(1000);
  Serial.println ("Message has been sent ->SMS Selesai dikirim");
}