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Ohh, my vote for that as well please. :D
It's pretty cool. You can also do calculations in the spreadsheet.
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Would this work for this:http://www.ebay.com.au/itm/Micro-SDHC-Card-to-WIFI-SD-Card-Adapter-Wireless-Memory-Card-for-DV-Camera-Styli-/201322205696?hash=item2edfbd1200:g:~r0AAOSwj2dXkJnD
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Also, if ABS gets too hot, it tends to gas out some pretty noxious gases. Recent research suggests that it's not too healthy to even be in a room with a 3D printer using ABS normally. If the iron got too hot, you might be putting your health at risk.
Some suppliers do have gold-coated probes, but as diy_bloke commented, with enough electricity, nearly anything will corrode. I haven't tried these, but I'd assume that if the gold coating was scratched or scuffed, the copper metal underneath would just get eaten out through the crack.
When I modeled the data above in Excel, I found that the derivative (dC/dV) with respect to water volume almost perfectly fit the logistic equation with a centre roughly between 120 to 125mL water, depending on the sensor. http://mathworld.wolfram.com/LogisticEquation.html... Since the differential equation of the logistic equation is dC'/dV = kV(T-V), (note that this is a differential equation of a 1st order derivative btw.), this suggests to me that the electrostatic field is being 'partitioned' between the soil and the plate in a series connection (hence the multiplication of the two factors, rather than addition). As V increases, the factor in the brackets becomes weaker, while the kV factor outside the brackets gets stronger. I'd suspect that as the soil becomes wetter, the additi...see more »When I modeled the data above in Excel, I found that the derivative (dC/dV) with respect to water volume almost perfectly fit the logistic equation with a centre roughly between 120 to 125mL water, depending on the sensor. http://mathworld.wolfram.com/LogisticEquation.html... Since the differential equation of the logistic equation is dC'/dV = kV(T-V), (note that this is a differential equation of a 1st order derivative btw.), this suggests to me that the electrostatic field is being 'partitioned' between the soil and the plate in a series connection (hence the multiplication of the two factors, rather than addition). As V increases, the factor in the brackets becomes weaker, while the kV factor outside the brackets gets stronger. I'd suspect that as the soil becomes wetter, the additional electrostatic field moves out into the water (factor outside brackets), meaning eventually this completely dominates any (weak) electrostatic field left in the sensor (factor inside the brackets). I also suspect that this is purely due to the water, as it seems to be pretty independent of the soil type as well.This is all empirical btw, trying to fit a theory to the fact that I got the logistic equation in my data. Maybe someone else can actually explain this from first principles rather than shoe-horn a theory to fit the data.
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Comparison of capacitive soil probes
I've graphed the second data set in Excel and visually, there isn't that much difference between the two capacitor plates, well within what I'd expect for experimental error. Both stay pretty flat until 100mL has been added, and then climb in an almost linear manner. Fitting a trend line to the 100mL to 250mL measurements I get the following equations:"His": y = 22.2x - 1810, R^2 = 0.9798"Mine": y = 23.5x - 2075, R^2 = 0.9852Obviously the sand test shows a considerably different result, but I'd argue that this little experiment shows evidence that we don't need to overthink capacitive soil sensors. Just use a bigger plate. My local electrical supplier actually sells blank double sided pcb, so I may give that a go for an even easier approach.
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Would this work for TPU flexible filament?
I can't help thinking that the algae may still be wet - it's still very green when you put it on the fire. From my childhood (on a dairy farm making hay) while the plant material is still green, it still has a moderate amount of moisture in it.
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