Building Dosing System With Arduino Controller

[kapelan]

I want to build a dosing system, decided to use these dosing pumps.
Already have a controller for it.
As usually when you have all parts the question is coming how to do assembly neat?
So I have pumps, box, controller ... and now need a laser cutting service to cut stainless steel
Does anybody know who can do it?

 

[TORX]

I have a thread in the DIY section using that pump

 

[kapelan]

how did you cut panels ?
I already have a controller with timers:

this is back panel:

And I'd like to cut new back panel and install there these pumps instead of 4 sockets.

 

[kapelan]

I have a thread in the DIY section using that pump

In a first place this controller was created for LED.
So it can be setup any spectrum as needed:

Spectrum can be changed during the day as well:

Now added dosers:

So need a new back panel.

 

[TORX]

I used a good old fashion dremel, files and elbow grease. Those pumps work great and if you read me thread, it shows that they do dose reliably over time. Only it is hard to just dose a little. Good luck with the build. Just remember, a doser is only as good as the programming.

 

[kapelan]

Finally laser cut panel arrived.
That's how it looks like now:

 

[EricTMah]

Nice! I'll be following. I like reading DIY projects like this.

Sent from my Z30 using Tapatalk

 

[scubasteve]

yep good inspiraion

 

[kapelan]

Started new version.
Planning change:
- replace ORP with one more PH channel. So it will be 2 PH channels
- add switch Fahrenheit/Celsius
- Some UI change: remove not used timers from the screen and use a button to "add new"
Thinking what else should be added/improved.
Any suggestion?
What do we need to automate the system?

 

[KBennett]

I'm doing the same thing. I find that even with optically isolated relay modules my arduino freezes when running these pumps. Can't figure out how to solve it.

 

[kapelan]

you need diode schottky

 

[KBennett]

Tried that. The issue is during steady run, not when it stops. Tried a 100uf cap across it too. Even tried a resistor in series with the output to lower current draw on the output. Nothing works. I'm using i2c and onewire. I think the extra current draw is somehow causing the communication to time out.

 

[kapelan]

Tried that. The issue is during steady run, not when it stops. Tried a 100uf cap across it too. Even tried a resistor in series with the output to lower current draw on the output. Nothing works. I'm using i2c and onewire. I think the extra current draw is somehow causing the communication to time out.

which power supply are you using?

 

[KBennett]

I tried several different configurations with different supplies. I have 3 separate 24V supplies and I use little step down chips for 5 and 12 volts. VCc on the relay board is totally separate... I'm going to try running them of a dedicated uno next...

 

[kapelan]

I'm using this one:
http://www.ebay.com/itm/DC-DC-LM259...499?pt=LH_DefaultDomain_2&hash=item43d68c28a3
And shotkey diode.
Power supply 2 A 12V

 

[KBennett]

No name 24 volt 5 amp power supplies. Pretty standardized model I think.
It runs for varying times before freezing. From a few seconds to several minutes.

 

[KBennett]

That's the converter I am using. Got mine from Dx. Com

 

[KBennett]

What relay board are you using?

 

[kapelan]

PCB that hold everything (RTC, relay ....) was designed.
it looks like this: (solid state relay on the right)

 

[KBennett]

Oh. I Have a sain smart solid state relay board for my ac pumps. it can turn the DC pumps on but can't interrupt the current. I assume it uses thyristors or instead of mosfets.