The Electronic Leaf automatic watering machine

There are many automatic watering systems on the market, this thing is aiming to make the simplest possible watering mechanism that can reliably maintain soil moisture in a greenhouse. It doesn't provide real time phone based monitoring, or advanced logging. But it's pretty easy to make and seems to be reliable (the longest operating one I have has been running for almost a year without problems).

## Parts you need:
* laser cut the svg from 1/8"(actually 2.6mm) luan ply. I'm sure you could make one without a laser cutter too.
* 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 the water on.
* a piece of cellulose sponge

## Construction
assemble as per the picture. With my laser cutter and ply, no glue is required. I guess you could spray paint the ply, but I've had pieces outside for several years without trouble.
switch the solenoid using the NC (normally closed) c