Most weather sensors transmit their sensor readings over 433.92 Mhz to the base station. The QRUQSP system receives this information via a RTL-SDR and it is stored in the weather module database. This provides the ability to generate 12 hour to 2 week graphs of Temperature, Humidity, Pressure and Wind Speed.
To date we have not found a 433.92 Mhz sensor that transmits Barometric Pressure. For this reason we provide a add on BME280 which can provide the pressure data to the Raspberry Pi.