So, a quick update. First of all, I’m considering falling back to the tried and true Dallas temperature sensors instead of the thermistors. At first I figured the thermistors would be an interesting alternative to familiarize myself with but as they require extra components, I’m gonna take the shortcut.
The same goes for the ultrasonic sensor. I’m going to try and find an affordable waterproof distance sensor to use instead.
So far I have the relay, light level sensor, soil humidity sensor and the temp sensors hooked up and working. Working on getting the EC sensing part set up. Still waiting for the actual probe, but I should be able to get the firmware done using any random stainless steel rods. It should boil down to calibration in the end.
I currently have 4 digital pins left- hopefully it will be enough.