To build a tower you will need to print the 3D parts shown on the left of the image.

The "Sensors float" part is optional, print it if you want to use the pH and EC sensors.

You will need 12 times the part: "Basket". 

You can download the files here.

Materials needed:

• PVC pipe ø100 mm, 1 m
• PVC pipe ø40 mm
• PVC glue

Tools:

• Hot air gun
• Saw

Notches:

Make 3 notches of 4cm on each floor. Each notch is 6.5cm spaced. And each floor is 16cm spaced.

To make the next steps easier you can make the notches 1 or 2 mm longer.

Thermoforming:

Here is a video on how to do it:

Use the 40mm pipe to thermoform the large pipe.

Bevel it for ease of use:

Finishing stage:

Glue 1 cm pieces of the small PVC tube into the holes.

Now the 3D printed baskets will fit perfectly in.

You can paint it white to prevent the PVC pipe from heating up too much on sunny days.

Materials needed:

• PCB
• 3D part: Cover
• 3D part: Water level
• 3D part: Top Tank
• 3D part: Disk nut *2
• 108 kHz piezo electric disk *2
• Small wires

You must first solder your PCB, put the esp32 on pins to be able to remove it and access the screw below. This PCB is modular, solder only the modules you want (see this log).

Assemble the cover and PCB with 2 screws.

For the water level sensor, 2 wires must be glued to the notches. Then simply screw this part into the cover. Then connect the connector to the PCB.

Finally, the tank must be assembled with the disks.