The Electronic Leaf automatic watering machine

thingiverse

There are many automatic watering systems on the market, but this project aims to create a super simple watering mechanism that can reliably maintain soil moisture in a greenhouse. It doesn't offer real-time phone-based monitoring or advanced logging features. However, it's relatively easy to build and seems reliable - I've had one running for almost a year without any issues. ## Parts You Need * Cut out the svg from 1/8" luan ply using a laser cutter (you can also make one without a laser cutter). * A piece of fence wire. * M2.5 nuts and bolts to attach the switch. * A spade crimp. * A microswitch. * A sprinkler, solenoid valve, and power supply to turn on the water. * A piece of cellulose sponge. ## Construction Assemble the parts as shown in the picture. With a laser cutter and ply, no glue is required. You can also spray paint the ply if you want, but I've left mine outside for several years without any trouble. Switch the solenoid using the NC (normally closed) contact, so that the water turns on when the sponge is dry. ## Positioning Place the sponge part under the sprinkler. I used aluminum flashing tape to create a hat that keeps water out of the microswitch. ## Adjustment Move the sponge up and down or trim it until you get the desired moisture level.