I’m going to have to look into those sensors. They are definitely pricey! A single sensor costs more than the PlantSmart I got on Amazon (it was $30 when I got it).
This is really cool! I just posted my own project on here. Didn’t realize I would pick a name similar to someone else’s, I named mine GardenSpark. Oh well.
I like your PCB idea, sleek design, I hope to make something as cool to encapsulate my project. One question on the design: are there plans for waterproofing? I would worry about the exposed core getting wet from watering or rain (but I assume your design is currently just for indoors).