Less than $50 for AutoDosing? Oh YEA!

[Darkblade48]

Originally Posted by mistergreen

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

[Optix]

Originally Posted by mistergreen

I just found a peristaltic for $25.

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

lol...nice. comes to thread to advertise his forum

[mistergreen]

Originally Posted by Optix

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.

[Wicket_lfe]

Saw one on ebay just like you made from HK selling for $30.

[Optix]

1. deer geezus is there nothing they wont counterfeit? lol

2. $30 + $15 shipping + $10 timer ...mine was cheaper

[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 $$$$$.

[Optix]

Originally Posted by dj2606

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

[dj2606]

Thank you

What size box would you recommend both pumps fit in?

[Optix]

no clue...when you go to radioshack...just eyeball it

[Darkblade48]

Originally Posted by Optix

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!

[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)