#include <VirtualWire.h>
#define RX_PIN 4

int times = 0;
long lasttime = 0;

void setup()
{
Serial.begin(9600);
  
  vw_set_rx_pin(RX_PIN);
  vw_set_ptt_inverted(true);
  vw_setup(2000);
  vw_rx_start();
}

void loop()
{
unsigned long currenttime = millis();
  
uint8_t buf[VW_MAX_MESSAGE_LEN];
uint8_t buflen = VW_MAX_MESSAGE_LEN;
    
if (vw_get_message(buf, &buflen))
{
      char Sensor1CharMsg[4] = "";
      long totaltime = (currenttime - lasttime) / 1000;
      int i = 0, Sensor1Data = 0;
      
      lasttime = millis();

        for (i = 0; i < buflen; i++) Sensor1CharMsg[i] = char(buf[i]);

        Sensor1CharMsg[buflen] = '';
        Sensor1Data = atoi(Sensor1CharMsg);
        
        Serial.print("Temp : ");
        Serial.print(Sensor1Data);
        Serial.println(" C");
        
        if(times)
        {
            Serial.print(totaltime);
            Serial.println(" seconds since last update.");
        }
        
times++;
}
}