Thierry Joubert's blog

From the monthly archives: November 2017

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Azure Watering system was not measuring (only) humidity...

After three weeks of humidity measurement, Azure data shows the following behavior:

I expected to see straight lines for sensors blue and green as they are in test tubes.
The measurement is not random though because:
1 - The fully immerged sensor (blue) gives higher values than the half immerged (green).
2 - Green and blue follow exactly the same pattern
3 - Red sensor which is in a pot, shows similarities in its evolution.

I copied local temperatures history from the same period from the Web and compared the two graphs on a day per day basis:


It is obvious that my "sensor in a test tube" is a pretty good thermometer!! 
In order to know the humidity of my pots, I need to correlate sensors information with local temperature and add some filtering mechanisms.
I added a DHT11 Temperature and Humidity sensor to the Azure Watering system (another option would be to get it from the cloud...)

Understand humidity with Azure Watering system

Now my Azure watering system has been running for a few weeks and I can use collected data to undestand how it behaves.
The data on Azure lead to the following graphs:

The big watering bars correspond to manual watering, from this graph I understand several key points:
1 - Humidity level should be maintained between 50 and 300
2 - Cooler temperatures in November have minimized evaporation ...or plants consumption
3 - The humidity variation during a day may be important compared to the interval given before
4 - All humidity sensors seem to follow an identical pattern, but my pots are not identical!!

To know more about humidity Sensors, i will modify the configuration, two sensors will be installed in test tubes, one completely immerged and the other one half immerged .

With this 100% stable configuration and Azure data recording, I expect a clarification on humidity measurement.

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