About 8 years ago, I used a Grove-moisture sensor to measure soil moisture. I left my office, keeping the sensor immersed in soil. The very next day, when I came back to the office, I found the sensor was already being corroded. I understood that the sensor was not for real-life use but for project demonstration only. Do you have any version now that can be immersed for years in soil without corrosion?
I just “conformally coated” them, and “potted” the electronics.
Solar powered, 30F UltraCap.
Very low cost solution.
What did you use for coating? Would you please share a little bit more?
Something similar to this… I don’t have the exact name as I finished my last batch. The one I used was black. This looks clear.
Then a 3D Printed enclosure filled with Silicon Sealant.
Edit> This looks like the coating I used.
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Hey, thanks for your detailed answer. Specially, the 3D printed case idea looks very wise. It is important to save the electronics from water. May I know where you printed it from?
Hi there,
I would concur, Great job, Who knew 
He’s been Hiding that nugget …
also it is linked in his post too , BTW,
You speed read psat it with all the eye candy.
https://makerworld.com/en/models/846431-case-for-capacitive-soil-moisture-sensor-v1-2-v2?from=search#profileId-793598
HTH
GL 
PJ 