#include <SoftwareSerial.h>

SoftwareSerial gsmSerial(0,1);

int ledPin=13;
int sensorwert=0;
int i=0;

void setup()
{
  Serial.begin(9600);
  gsmSerial.begin(19200);
  delay(2000);
  pinMode(ledPin,OUTPUT);
}

void loop()
{
  sensorwert = analogRead (A0);
  Serial.println(sensorwert);
  
  if(sensorwert >= 800 && i == 0)
  {
    sendTextMessage();
    i=1;
  }
  delay(4000);
}
void sendTextMessage()
{
  gsmSerial.print("AT+CPIN=xxxx\r");
  delay (6000);
  
  gsmSerial.print("AT+CMGF=1\r");
  delay(4000);
  
  gsmSerial.print("AT+CMGS=0179xxxxxxx\r");
  delay(4000);
  digitalWrite(ledPin,HIGH);			//nur zur kontrolle ob programm in fkt springt
  gsmSerial.print("Licht ist an!");
  delay(100);
  gsmSerial.print((char)26);
  delay (4000);
}