Nice! Capacitance moisture sensor is totally the way to go. I've never ordered up a custom board with all the little SMD stuff. If anyone is making a big batch of these I'd love to find a way to piggyback on that order.
If you want to piggyback onto this order or collaborate please send an email to morphle at ziggo dot nl.
We can lower the price per moisture sensor down to $1.42 when we order 100000 or more or by dropping labour intensive features.
At a shared/combined batch order of 1 million sensors we will drop to $0.30 per sensor. At this point it is economical to have a sensor per plant (or mecanically planted seed).
With optional starlink and solar panels and batteries for full offgrid operation. Custom software features in an app for smartphone or laptop with a https://microblocks.fun type programmability and spreadsheet graphs and website output would be optional. We could add microphones and motion sensors to sense rodents or snails or monitor (rain)forest for illegal cutting with chainsaws or poachers.
https://m.fr.aliexpress.com/item/32689223035.html?html=stati...
https://www.amazon.fr/Corrosion-Resistant-Capacitive-Moistur...
If not I run www.openagriculturesupply.com amd would love to help find something that does.
https://www.seeedstudio.com/SenseCAP-S2105-LoRaWAN-Soil-Temp...
https://oshpark.com/ they offer free shipping from memory - really cheap. i got these shipped from America to Australia :)
for 1 design - you get 3 pcbs (identical)