Davis Temperature and Humidity Sensor Sensitivity.

KI5OMM Weather Station

I’ve replaced the Temp/Hum sensor several times over the years as they seem to last about 3 or 4 years before they start showing signs of inaccuracy. The current sensor that I am using now is a Sensiron SHT31 that I purchased from Scaled Instruments in Fl. Continue reading

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Building a Fan Aspiration Unit

Fan Aspirated Shield

One thing about the Cotton Region Shelter design is that it’s made of wood. Even though it is painted white, it still has a lot of thermal mass on the outside and it tends to unevenly heat the interior, especially on very hot and still days. I built a solar powered fan aspirator to hopefully even out the temperature spikes seen on the daily graphs during the hottest part of the day. Here is how I constructed it. Continue reading

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Rain Gauge Measurement Calibration Procedures

rain gauge calibration

After a recent rain event, I noticed that The Davis tipping bucket rain gauge was not reading correctly. For comparison purposes I have it mounted side by side with a standard 4″ manual gauge of known accuracy. The 4″ gauge registered 1.12″ of precipitation while the Davis gauge registered .88″ of rain. This is a significant difference for such a small amount of total rain. Continue reading

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Rain Gauges

KI5OMM weather station

The rain gauge that I use for the KI5OMM weather station is a tipping bucket design. This allows for automatic and unattended operation. This type of rain gauge is fairly accurate for most rainfall events. They do have a few flaws that can lead to errors in reporting. For this reason, I also use a manual 4″ rain gauge for backup. Here is a description of my setup and design for my station. Continue reading

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