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A double syringe pump for flow chemistry

Here we plan to build a double headed syringe pump setup to be used in the studies of flow chemical reactions

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The goal is to make an open source syringe pump from the beginning using arduino + lcd to control the step motor. I plan to open code as well all the measures needed for build the setup. The photos shows just the mechanics. I´m using an old step motor from a printer and a drawer slide as a linear guide. I´m using this just as a proof of concept, but the first results are pretty good, adding 1 ml over one hour, very precise.

Finally I finished the mechanical part using a solid base of polyacetal polymer and a drawer slider. The base was modeled using a router and is very robust. I ´ll post the measurements for the base later. The arduino code needs a little bit of work but I plan to finish it this comming week

  • The mechanics

    Alfredo MArques07/28/2014 at 00:14 0 comments

    Finaly I finished the mechanical part. I´m using a piece of polyacetal plastic as a base and as a syringe holder. I´ll post the measurements later this coming week. The arduino code needs a little bit more work. As soon as I finish it I´ll post here.

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naroom wrote 07/29/2014 at 21:11 point
I have a basic menu in the code for my syringe pump. I put it up in case it will help in your efforts:

https://github.com/naroom/OpenSyringePump/blob/master/openSyringePump/openSyringePump.pde

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naroom wrote 07/28/2014 at 22:33 point
Hey Alfredo!

I'm glad you made a project. The drawer slide idea is very cool.

So, right now I'm using the same keypad+LCD shield you are, but I've run into a lot of trouble with the buttons. Usually they will register the correct response, but sometimes they will be incorrect. For example, the "Right" button registers as "Up" sometimes.

Have you run into this problem too?

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Alfredo MArques wrote 07/29/2014 at 19:59 point
Hi naroom, I run into the same problem with the buttons and the cause was a variable that was set as int. when I change it to long everything start working. I wiil put the code ( based on the code of lucadentella) this week. I give up to work with menus, as I do not have enough programming skills to do that. regards
alfredo

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Gabriel wrote 07/24/2014 at 14:39 point
Check out the little plastic check valves used to keep water from going into the air pumps of fish tanks.

http://www.amazon.com/dp/B00KJF5H1I/ref=asc_df_B00KJF5H1I3229676?smid=ATVPDKIKX0DER&tag=pg-867-17-20&linkCode=df0&creative=395097&creativeASIN=B00KJF5H1I

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Gabriel wrote 07/24/2014 at 11:39 point
I had thought of this like 2 weeks ago!
If you add a couple of check valves, you can have it suck from one container and dump in another.... for continous pumping add more check valves and another syringe reversed!

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Alfredo MArques wrote 07/24/2014 at 14:31 point
Hi Gabriel first things first!! kkkk The ideia is first to have the syringes adding volumes in constant steps and do a test using a condensation reaction. Look for naroom here in the hackaday projects. He has started a similar project a while ago too. Check valves are the second step to be developed since they are pretty expensive in the market. Another accessory to be developed is a back pressure valve, since this device allows for heating solvents a lit bit over their boiling point. Today I´m making another support to give a safer and better look to the syringes/motor support. Next week I´ll post new pictures.
regards from Brasil

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