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Thread: Less than $50 for AutoDosing? Oh YEA! Reply to Thread
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Topic Review (Newest First)
12-23-2014 10:21 PM
Optix /old thread

I eventually upgraded my dosing pump

bought two pump heads/motors...a 12v relay...and wired the thing so that it doses macros one day...micros the next (basically, two mechanical times plugged into eachother on a 12 hr setting) and a digital timer set at 1 minute that turns on everyday

a simpler design would be to have a timer that energizes the relay on for thirty minutes while the other multi-timer (at 1 minute) controls the first pump for macros...and then comes back on 6 hrs later and controls the micro pump


...but if it aint broke


also, Im mixing my macros

KNO3, K2HPO4, K2SO4 and MGSO4

and my micros

Millers Micro (or CSM depending on what I have on hand), FE and CACL2


...all thats left is feeding the fish and water changes


...I cant wait to own a house so I can do this with some scale
02-19-2013 12:00 PM
Optix 3 months in...no problems with the pump/tubing

changed the solution once....next time im using a gallon jug (~3780 ml) so almost 6 months w/ no effort

to be fair tho...I have a soil tank...so I dont dose micro nutrients...only macro

my biggest problem so far was that when i mixed the MgSO4 and CaCl2 into my dosing solution...CaSO4 would precipitate out

now I dissolve the CaCl2 in tank at water change (and my plants have straightened out for it)
01-19-2013 09:06 PM
Darkblade48
Quote:
Originally Posted by Optix View Post
3. yes...both positive leads to the positive supply...both negative leads to the negative (though technically if you switched it up duing assembly...the pump heads would rotate different directions...wouldnt hurt a thing)
Unless you've already placed the tubing into the fertilizer bottle and your aquarium

You might get aquarium water into your fertilizer bottle!
01-19-2013 07:30 PM
Optix no clue...when you go to radioshack...just eyeball it
01-19-2013 06:34 PM
dj2606 Thank you

What size box would you recommend both pumps fit in?
01-19-2013 06:27 PM
Optix
Quote:
Originally Posted by dj2606 View Post
just to make sure I'm getting the right power supply,

1. ebay
180834970373

Planning on running 2 pumps on one supply.

Another few questions
2. Will 2 pumps fit in radioshack project box? Or will 2 separate boxes be needed?

3. to run parallel you would run the positive from power supply to each of the 2 pumps and then the negative from the supply to each of the 2 as well?

4. Where did you get the tubing? Is it just airline tubing or co2 tubing?



Great thread BTW, very informative and saves $$$$$.
1. yes...that power supply will work
2. yes...they have several sized project boxes...so 2 in 1 housing is easy
3. yes...both positive leads to the positive supply...both negative leads to the negative (though technically if you switched it up duing assembly...the pump heads would rotate different directions...wouldnt hurt a thing)
4. yep...standard cheap airline tubing -little trick...cut a V in the bottom so that the tubing cant get stuck to the side of the fertilizer container and mess up your dosing
01-19-2013 03:55 PM
dj2606 just to make sure I'm getting the right power supply,

ebay
180834970373

Planning on running 2 pumps on one supply.

Another few questions
Will 2 pumps fit in radioshack project box? Or will 2 separate boxes be needed?

to run parallel you would run the positive from power supply to each of the 2 pumps and then the negative from the supply to each of the 2 as well?

Where did you get the tubing? Is it just airline tubing or co2 tubing?



Great thread BTW, very informative and saves $$$$$.
01-19-2013 02:24 PM
Optix 1. deer geezus is there nothing they wont counterfeit? lol

2. $30 + $15 shipping + $10 timer ...mine was cheaper
01-10-2013 05:56 PM
Wicket_lfe Saw one on ebay just like you made from HK selling for $30.
12-20-2012 09:43 PM
mistergreen
Quote:
Originally Posted by Optix View Post
lol...nice. comes to thread to advertise his forum
My bad.. didn't mean too. I deleted the post. I found the pump before coming onto tpt.
12-20-2012 09:36 PM
Optix
Quote:
Originally Posted by mistergreen View Post
I just found a peristaltic for $25.

http://aquatictechtank.net/viewtopic...7ec75e2adc1939

lol...nice. comes to thread to advertise his forum
12-20-2012 05:46 PM
Darkblade48
Quote:
Originally Posted by mistergreen View Post
You can control it with pmw. I'd imagine it could be 0 - 100ml/minute.

Next project to control with the arduino.
I noticed it could be controlled with PWM too, but it doesn't necessarily mean that the minimum flow rate is 0 mL/min...does it?

For example, the one on eBay has a minimum flow rate of 0.1 mL/min (which I guess is as close to 0 as possible).

In any case, autodosing was part of my plan for an Arduino based aquarium controller
12-20-2012 05:43 PM
hbosman Here's another one available on Ebay:

400367643085
12-20-2012 05:19 PM
mistergreen
Quote:
Originally Posted by Darkblade48 View Post
While more expensive than the ones on eBay, I am tempted since the current draw is less.

The technical details lists the maximum rate (100 mL/minute), but I wonder what the minimum is...
You can control it with pmw. I'd imagine it could be 0 - 100ml/minute.

Next project to control with the arduino.
12-20-2012 05:06 PM
Darkblade48
Quote:
Originally Posted by mistergreen View Post
I just found a peristaltic for $25.

http://aquatictechtank.net/viewtopic...7ec75e2adc1939
While more expensive than the ones on eBay, I am tempted since the current draw is less.

The technical details lists the maximum rate (100 mL/minute), but I wonder what the minimum is...
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