So I had this idea, using the ATtiny85, giving the plant some water every two days or something.
So at first I thought of putting a bottle filled with water with a small hole on the bottom, and have a servo with a plastic square attached to it move out of the way of the hole letting water flow, and after about 5 seconds shut it back.
Problem is it's very weak and the mighty pressure of the water will make it crash after a few hours.
Any ideas? Thanks!
Do some research, there are all kinds of plant feeders made with the Arduino. Some use humidity sensors to know when to water the plants.