Sensors - davepeake/weather_station GitHub Wiki
Sensors
Rain / Wind Direction and Wind Speed seem to operate the same as this setup: https://www.sparkfun.com/datasheets/Sensors/Weather/Weather%20Sensor%20Assembly..pdf
Rain
Using this sensor: http://www.aliexpress.com/snapshot/6523768599.html
Rain sensor is a tipping scale style, where the buckets are balanced on a pivot. As the rain flows, the buckets empty and the see-saw moves. The see-saw is connected to a reed-switch which closes when the pivot moves.
Basically it works as a button that triggers once for a certain amount of rain flow.
Uses RJ11 connector - Two central connectors
Wind Direction
Using this sensor: http://www.aliexpress.com/snapshot/6523768598.html
Gives 16 discrete directions by connecting different resistors by switching them in as the vane rotates.
Combined output with the wind speed RJ11 connector - outer connectors
Wind Speed
Using this sensor: http://www.aliexpress.com/snapshot/6523768600.html
Switch closes once per rotation.
Combined output with the wind speed RJ11 connector - inner connectors
Air Temperature
Probably use a freehanging thermistor external to the box such as http://www.ussensor.com/sites/default/files/downloads/USP11491.pdf
Barometer
I2C SMD Barometer - http://www.freescale.com/files/sensors/doc/data_sheet/MPL115A2.pdf $3.29 @ 1
Humidity
Si7007 - https://www.silabs.com/Support%20Documents%2fTechnicalDocs%2fSi7007-A20.pdf