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Rain measurement: Difference between revisions
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Text replacement - "Cumulus.ini" to "Cumulus.ini_(Cumulus_1)"
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== Rain day ==
The threshold value which the daily rainfall has to equal or exceed for the day to be considered a 'rain day' is set in [[Cumulus.
== Cumulus View Menu ==
== Optical Rain Gauges ==
#One design has a row of collection funnels. In an enclosed space below each funnel is a [http://en.wikipedia.org/wiki/Laser_diode laser diode] and a [http://en.wikipedia.org/wiki/Photodiode phototransistor detector]. When enough water has been collected to form a single drop it drips from the bottom of the funnel, falling into the laser beam's path. The detector is set at right angles to the path of the laser beam so that light scattered by the drop of water breaking the laser beam is detected as a sudden flash of light. The flashes from these photodetectors are then read and transmitted or recorded.
#The [http://www.rainsensors.com/| Hydreon Optical Rain Sensor] - Model RG-11 - uses an infrared sensor to detect rainfall with high precision. Some car windscreens have a similar sensor to automatically start wipers. Cumulus supports the RG11, via parameters in [[Cumulus.
#*either to the Data Set Ready (pin 4) and Data Terminal Ready (pin 6),
#*or to the Request To Send (pin 7) and Clear To Send (pin 8)].
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