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// Include VirtualWire library
#include <VirtualWire.h>
#include <SoftwareSerial.h>
SoftwareSerial SIM900(2, 3); // configure software serial port

// Pins definition

const int receive_pin = 9;
int minSecsBetweenCalls = 30; // 0.5 min
long lastSend = -minSecsBetweenCalls * 1000l;

void setup()
{
  SIM900.begin(19200);
Serial.begin(19200);


delay(20000); // give time to log on to network.

  digitalWrite(6, HIGH);
  delay(1000);
  digitalWrite(6, LOW);
  // software equivalent of pressing the GSM shield "power" button

   // Initialise the IO and ISR
   vw_set_rx_pin(receive_pin);
   vw_setup(4000); // Transmission rate
   // Start the receiver PLL
   vw_rx_start();
   // Set LED pin and Buzzer

}

void loop()
{
   long now = millis();

   uint8_t buf[VW_MAX_MESSAGE_LEN];
   uint8_t buflen = VW_MAX_MESSAGE_LEN;

   // Check if a message was received
    if (vw_get_message(buf, &buflen))
    {
      if(buf[0]=='1')
      {
      if (now > (lastSend + minSecsBetweenCalls * 1000l))
    {
      Serial.println("Motion detected!");
      SIM900.println("ATD + +47xxxxxxxx;"); // dial number (language code between + and your phone number)
      lastSend = now;
      delay(100);
      SIM900.println();
      delay(30000); // wait for 30 seconds...
      SIM900.println("ATH"); // hang up
      }
     if(buf[0]=='0')
     {
     Serial.println("Motion ended!");


     delay(300);
     }
   }
}
}