03-09-2018, 17:34
Hi engolling,
Well, we can add support for almost any kind of sensor we want, specially when its just a matter of adding software support, however in my humble opinion, I think that we should always consider if the readings from the sensors we are adding, conform with any standards.
In my point of view the proposed soil moisture sensor can't be seen as an alternative to the Vegetronix VH400. When I added support for the soil moisture to the WeatherDuino system, I had the opportunity the learn some things (thanks to JT118, for all the info sent to me) about reading soil moisture, that I couldn't even imaginated.
Not entering in details, the soil moisture usually is expressed in volumetric water content or centibar (yes, a pressure unit). The output of the proposed soil moisture sensor indeed changes with the soil moisture, but you don't have any correlation with a standard measurement unit. So, what means when the output voltage is 50% or 75%.
I have more or less the same concerns regarding the BME680: "... Note it will give you one resistance value, with overall VOC content, but it cannot differentiate gasses or alcohols."
What are we really measuring? There are any standard scale for this?
Regards
Well, we can add support for almost any kind of sensor we want, specially when its just a matter of adding software support, however in my humble opinion, I think that we should always consider if the readings from the sensors we are adding, conform with any standards.
In my point of view the proposed soil moisture sensor can't be seen as an alternative to the Vegetronix VH400. When I added support for the soil moisture to the WeatherDuino system, I had the opportunity the learn some things (thanks to JT118, for all the info sent to me) about reading soil moisture, that I couldn't even imaginated.
Not entering in details, the soil moisture usually is expressed in volumetric water content or centibar (yes, a pressure unit). The output of the proposed soil moisture sensor indeed changes with the soil moisture, but you don't have any correlation with a standard measurement unit. So, what means when the output voltage is 50% or 75%.
I have more or less the same concerns regarding the BME680: "... Note it will give you one resistance value, with overall VOC content, but it cannot differentiate gasses or alcohols."
What are we really measuring? There are any standard scale for this?
Regards