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dosing pumps
#21
It's an SOT-23-3, 600ma should be enough. Here's a link to the one I'm using.

http://www.mouser.ie/Search/ProductDetai...16NH6327XT
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#22
I just added some IRLML2502 to a existing ebay order. They are plenty strong enough and should be here quick enough.
But thanks Rob.
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#23
Great, those look like they'll do the job.
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#24
Quick question..
Since reefers tend to use slower pumps for more accuracy, is there a way to use a trimpot on the standard 12v dosing pumps to let them run slower? Or is there a way to set up stepper motor dosing pumps using the current controller hardware?
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#25
Only way to slow them down is to lower the voltage to them, the pins controlling them aren't PWM but they will be on next set of board. Because the controller switches the GND you can use a lower voltage power supply or a DC-DC converter to drop the 12v. You can't connect stepper motors mainly because there isn't enough pins on the Arduino unless you use pins for other ports but would have to adjust the code. Quite a few have mentioned stepper motors to me so when I make the dosing pump addon I'll make sure they can be used.
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#26
Thanks
Gonna look for a stepdown regulator now ;)
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#27
Fitted an L7806 to my micro pump, which dropped down the voltage to 6v and dosing speed to 1/3 of the nominal flow at 12v
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#28
Nice, maybe it'll bring down the power bill as well. :)
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#29
Well... I already checked my power consumption... the tv uses more power than the aquarium, So I’ll be sitting in front of the tank instead of the tv xD
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#30
That's good, you'll also save some brain cells in the process.
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#31
Ok So I’ve got a hardware issue (I guess)
The pump fitted with the L7086 has stopped working, it reads 4V with the L7086 fitted and 12V without.
It doesn’t rorate and isn’t activated by the controller.
As soon as I do a manual dose it drops to 0V for the dosing time and then reverts to its previous voltage.
The other 3 dosing pumps are at 0V when not in operation and go to about 10-11V when running.

I rebooted the controller by unplugging the screen and plugging it back in, and rebooted it with a 10 minute full power down.

As I’m writing this it has come to my mind that the only thing changed in the past few weeks in regards to the controller was an SD card.
To speed up the display I scourced and fitted a 128mb SD card, which was a slight inprovement.
I now swapped it back with the 1Gb and the pump is up and running again.

So it appears that an SD can cause some strange behaviour..
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#32
Hmm, that's strange, I can't imagine an SD card doing that as they have nothing related on them. Sounds more like a bad connection but obviously you got it fixed so I don't know.
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#33
well the odd thing is that the problem got resolved the moment I swapped the SD card.
Didn’t change it back But by looking at my dosing canister its about the level it was 2 weeks ago when I swapped the SD card
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#34
That is odd, if you put the 128mb card back in does it do the same?
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#35
Didn’t do that yet, had to get cracking on with cleaning the house and other chores
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#36
lol yeah you better do that
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