I am looking to create a programmable fertilizer doser, with 8 different nutrients. I'm curious how I would add 6 more to the 2 that are already present with the initial setup of Hydrosys4.
Also, while I'd love to build the exact version of the fertigator on the youtube video, I cannot find a water filter housing with a top port to modify with the injector. I'm wondering what people might think of using a 3/4 venturi similar to this one:
I would hook the nutrient input to the injector on the venturi, but then only allow nutrients to pass through when I activate the motor, to allow nutrients to flow for a set period of time/pulse. I wonder if the pump would prevent nutrients from flowing out when the motor is not running? That would be important to allow precise measurement.
All thoughts are welcomed on this approach, or any other approach to create an automated 8 head doser.
Many thanks,
Paul
That system in the link is impressive.
We should open a KickStarter campaign to make it in kits :).
What is more intriguing is that the pump supplier that he mentioned (ETATRON) is here in Rome.
Anyway I did not know that there where pumps called injection pumps...
Hi There,
To change a normal "Irrigation" line to the "Fertilizer" line you just need to go to the HardwareSetting, click "edit", select the Relay and change the "usedfor" filed to "fertilizecontrol", click "confirm and Save". That's it.
In this way you can see the Relay on the FertilizerPlan page. Have to say that using the fertilizerplan is not strictly required as also the watering plan can be used, at the end they just activate a switch at a certain time for a certain period.
The Venturi Injector looks quite a good solution,
In the following post there is a link to a video regarding dosing:
https://hydrosys4.wixsite.com/hydrosys4forum/forum/hardware-discussion/water-flow-sensor/p-1/dl-5e0bad32c573fc004867ddea
As you pointed out the inlet of the venturi injector creates a negative pressure, normal pumps will let the liquid pass through, peristaltic pump will not let the liquid pass, anyway seems a little odd to connect the pump directly to the Venturi inlet.
I think the easiest way would be to use the doser pump to drop the liquid in a container where then the Venturi inlet will suck the liquid, the container will act as buffer.
Anyway as I'm not expert in this area, maybe I'm missing something too.