How Does Weather Station Work?

Wind vane/anenometer at top, console lowerleft, outdoor temperature/humidity sensor lower centre, raingauge[unmodified] lower right The outdoor sensing instruments are mounted on a 10 metre tall mast at the NRA Offices in Trentham. There are three outdoor sensors, all shown above, a temperature/humidity sensor, a wind vane/anenometer and a rain gauge which has been modified to record in 0.1mm steps instead of the more usual 1.00mm steps. There is also an outdoor webcam mounted in a special weatherproof housing on the mast which takes images of the riflerange/flying field looking in a Southerly direction. The data from these sensors & the webcam is transmitted down special cables to a console unit [also shown above] mounted on the office wall. The console unit also senses indoor temperature/humidity and barometric pressure. All the data generated is sent every minute via a serial cable to a computer[which runs 24/7 ] where a special weather software program called Weather Display generates the web pages which you see. Every 15 minutes, fresh data is uploaded to the website via modem. The data from the webcam is sent by cable to one of the computers USB ports. The whole process is automated except for continuing upgrades to the program which happen two or three times a month. The 3Com Home Connect digital webcam takes a shot of the sky looking in a Southerly direction 10 seconds before the upload. The picture generated is uploaded along with the rest of the data.