Automatic Plant Watering Device (simple version)

Step 2 Calibrate

First be sure that you have all of the parts and tools listed in the intro.

Next we need to figure out how much water you want to give your plant. To do that...

1) Put one of the pumps in the smaller tub.

Mine had suction cups to secure it.

2 )Put some water in the small tub then pump it out.

Hook up your hose to the outlet and run the pump until it stops pumping anything. This should leave a small amount of water at the bottom that the pump can't reach.

3a) Measure how much water you want your plant to get each time and pour it into the tub.

The volume of the tub now contains the water you measured, the water the pump can't pump, and the pump its self.

3b) Mark the high water level on the tub.

No project is complete without using a Sharpie.

4) Pour the water out and cut a 1" square with the bottom of the hole level with the high water mark.

Only the bottom edge of the hole needs to be precise. This hole is simply so all the extra water pumped in will flow back to the main reservoir.