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Old 01-05-2005, 01:22 PM   #11 (permalink)
 
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I just use an Aqua medic dosing pump, they run 88$ but work great to the ml. They can have any sized reservior so I only refill once every month or so.

You can adjust the solution concentration to match your desired levels in the tank/dosing etc and use a number of DIY devices I've seen.
Timer based ideas work well, there are many designs that will pinch a silicone tubing line and allow on/off from 15 min up to 12 hours etc.



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Tom Barr
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Old 01-05-2005, 03:51 PM   #12 (permalink)
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Interesting idea for autodosing for less than $20. I'm not sure I understand the timing motor recommendation Giancarlo, could you please elaborate on that a little more for us non engineering types?


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I just use an Aqua medic dosing pump, they run 88$ but work great to the ml. They can have any sized reservior so I only refill once every month or so.
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Old 01-05-2005, 07:15 PM   #13 (permalink)
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Timing motors or clock motors... they are used in washing machines, large clocks and just about anything else that needs a mechanical timer. Clock motors have a set speed and 1, 2 or 3 shafts for each hand of the clock, single hour hand motors would be perfect, many old train station style clocks used a single hour hand without a minute hand. Timing motors on the other hand come in various speed ratios, but they are all rather slow and very powerful as they often need to turn a large number of mechanical pieces. AC motors are best, they are cheap and the timing is kept accurate by the 110v frequency rather than having to use control circuits. The rest is just a lot of reduction gears.

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Old 01-05-2005, 07:22 PM   #14 (permalink)
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Ruben, I would also suggest moving the pivot point of the syringe to the tip rather than half way up the syringe body. This will reduce the swinging of the tip where the hoses are connected to meaning less strain for the motor.

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Old 01-06-2005, 05:05 AM   #15 (permalink)
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Are you going to build this Gian? If you do, please post pics on your improved version.
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Old 01-06-2005, 07:40 AM   #16 (permalink)
 
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Yes in my own dispenser the pivot point is very close to the tip of the syringe (as I told you before I use PVC pipes to make a sleeve for the syringe, it's easier to work with), today I found a 2 rpm motor,and like plant brain said I just have to add more water to my fert mixture, and diminish the quantity of fertilizer per cycle going into the tank.
All improvements are welcomed (and wanted) so far is a Mexican/Spain/Dutch/US project , the original project was very crude but it has been really improved =D> , I hope it works for you too
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