I'd like to use it in water control. Water is essential it's ok to put on a little solar pump and walk away, but if you forget to switch it off you're wasting water. It would be great to automatize these things. An Arduino can fail too, don't get me wrong, but probably not as many times as me.
I got an automatic door for the chickens that lived in the caravan. It opened in the morning a lot earlier than i would have opened it for them, but in nature, chickens are out at first light, because that is when the bugs go hiding, a lot of their protein comes from that moment. I forgot to check the batteries and apparently it was open constantly,at night a marter came in and killed all of them. If i had had some kind of battery low warning system that wouldn't have happened, but since it was pretty complicated as it was, to get that system working, i didn't do something like that. I didn't think of either, but that aside.
If a greenhouse gets hot an automated system to open the doors would come in handy. I'm sure it all exists already, but it would be nice to make it myself, so i can fix it as well. Chickenfeeder, automated.
I saw one little system that was even lower tech, which i am going to put to use when the new chickens come.
It's priceless to have things automated, i am a hobby farmer, i need to go to work, and it would be nice if things run smoothly so i don't have to do it after work or before.
For real farmers it's the same. My neighbor wants a system that uses the well water when it's above a certain level, pump on..but wants it to shut down when it comes below a certain level so it doesn't suck up muck. And still you can walk away in stead of doing chores closeby and maybe forgetting when an emergency arrives.
Stuff like that. Maybe i'm dreaming, i wouldn't know, but i guess these systems will be worth a buck for farmers to install. Bridging the gap between the cheapest chinese stuff which breaks and the fanciest systems that cost a fortune. Stuff custom made.
Me being me, i started to worry the farmers would deplete the watertable. And the love for electronics was over when i just got too busy with a new project outside, but it's just shelved.