Sounds like a neat project, but you’ll need to pick sensors that give you reliable data first. I can hook up a light sensor, a hygrometer, and a soil moisture probe, then feed the values into a small microcontroller. From there the code can run a simple rule‑based algorithm to decide when the soil is dry enough to water. Don’t forget to add a log or a simple display so you can see the trends without looking under a microscope. If you need a template, let me know.