Introduction: Pulsing Fluidic Heart Micropump

I made this vacuum driven, absolutely silent!! heart micro-pump as a byproduct of my playing with microfluidics. It works pretty fine as a pump, pumping some milliliters per minute, but I prefer to consider it as a first step towards a "gadget" such as a fake but cool heart rate monitor or a pulsing fluidic heart pendant, because of the natural looking "heart beat". Any other ideas are welcome.

In any case it works on the same principleas aREAL HEART. Two expanding and contracting chambers (heart shaped) push fluid through one-way valves, thereby establishing a directional flow instead of just oscillatory motion of fluid. The "heart-beat" is generated by a fluidic ring-oscillator which as the electronic counterpart comprises 3 pneumatic inverter circuits connected in a loop. The whole circuit is powered just by compressed air or vacuum, which is supplied by connecting an external vacuum pump or compressor to one of the holes on the chip. In a more advanced version (with reduced air consumption) a small 8 g CO2 cartridge should be able to sustain the pumping for several tens of minutes but I have not yet managed to keep air consumption as low and so for the moment you will need an external small vacuum pump to make it work continuously. As a portable silent vacuum "power supply" for the moment I use two 60 ml syringes connected together. One syringe acts as a piston of a hand vacuum pump and the other as a vacuum chamber. Think of it as a "hand rechargeable air battery".

To make this "micro-pump chip" you need

- a CNC mill...if you don't have one but have a 3D printer instead maybe it will also work ...not sure. I have no experience with 3 D printing. In any case you will need to print transparent material.

- a plexiglass board 3-4 mm thick

- a PVC rubber sheet 1-2 mm thick

- a few sharp CNC bits to mill sufficiently fine channels (0.2-0.3 mm wide). I used sharp 'scoring' tools used for milling copper traces in PCB boards.

- transparent casting silicone such as RTV615 or Sylgard184 to cast thin silicone membranes. If you can find commercial 0.2-1.0 mm thick transparent silicone rubber sheets that's fine, but I doubt you will find them.

But enough of words let's see in more detail what you need to make it:

Step 1: Description of Materials and Parts Needed

So let's begin with a description of the components you need:


1) first of all you need a vacuum or compressed air "power supply". For simplicity and for lowest cost you can use just two 60 ml syringes connected together with some one-way valves, T-joints and tubing so that one syringe acts as a suction piston and the other syringe as a vacuum chamber ( think of it as a "hand rechargeable pneumatic battery" ). The scheme and the realization is shown above.

2) A plexiglass plate, mine was 3.85 mm thick. Any other with thicknesses above 3 mm will work, just keep it below 5-6 mm otherwise your micro-pump ( actually "milli-pump" ) gets to bulky. Avoid polystyrene. It is too fragile for the present purpose.

3) a transparent PVC rubber sheet some mm thick. I found PVC rubber was the only transparent rubber that I was able to CNC mill decently. Silicone rubber is by far too elastic and tends to tear. PVC rubber actually is a highly softened plastic rather than a real rubber. Any suggestion for alternative materials is welcome. Another reason why I choose PVC rubber is that it is soft enough to conform to slightly uneven surfaces but stiff enough not to deform under compression. This is important since it is sandwiched between two plexiglass plates compressed by screws.

4) either you can buy a transparent silicone rubber sheet 0.2-0.3 mm thick or you cast it by your own using silicone rubber of sufficient hardness such as RTV615 or Sylgard 184. If it is too soft then it will not work since it will be compressed too much in the sandwich. For instance oogoo doesn't work (unfortunately). To cast silicone membranes and slabs I use also plumbers putty, a glass plate, dish-washing soap, a balance with 0.1g resolution.

5) you need some sort of small diameter soft tubing (I used Cole Parmer Tygon Microbore Tubing, 0.010" x 0.030"OD, 100 ft/roll EW-06418-01)

6) some small containers (few ml) which you may build from tubes or small plastic boxes, small syringes, Eppendorf vials, or even from LEGO bricks.

7) any colored fluid to test the pump. I used food dye which washes away relatively easily if you spill it.

Step 2: Description of the Parts Making Up the Micropump

The micro-pump device is made from 5 "layers" sandwiched together in a stack tightened by four 2 mm screws.

1) The top layer is made of a milled plexiglass plate 32x32x 3.85 mm in size containing fluid channels, heart shaped chambers, "one-way" micro-valve seats and "membrane expansion chambers" for the "transistor like" micro-valve plus two auxiliary vacuum chambers. It also contains conical holes for connection of the device with small diameter tubing to the vacuum or compressed air power supply and for connecting three small containers for vacuum or compressed air.

(STL file "3Dfile1correct.stl")

2) then follows a thin silicone rubber membrane 0.2-1 mm thin. I usually use a 0.4-0.5 mm thick one cast by my own on a glass plate previously smeared with a thin layer of dish washing soap so that the cured membrane can be released from the glass plate (otherwise silicone will bond to glass). The silicone membrane has holes punched in it at the "right" places that serve as "vias" to let air and colored fluid flow through from the top layer to the PVC layer (3). The holes can be punched manually using a punching-mask plate that I describe later.

3) the next layer is a PVC rubber sheet (mine is 2mm thick) milled on both sides with channels for air. Also there are "diode-like micro-valve" expansion chambers and "transistor-like micro-valve" seats milled in it that allow the silicone membrane(2) to deflect in the places defined by the micro-valve-seats and the heart-chambers. Finally through-holes ("vias") are milled in the PVC rubber sheet to connect back-side to front-side air channels. The stack of top layer (1), silicone membrane (2) and PVC rubber layer (3) together define the micro-fluidic & micro-pneumatic circuit described in the scheme in step1 of this instructable. The circuit elements are pneumatic micro-valves (act like transistors), fluidic "one-way valves" (act similar to diodes) and fluidic resistors (just narrow/long channels..therefore the serpentine design of some channels). As I already said the circuit acts like a fluidic ring-oscillator and drives the alternating ("anti-phase") expansion/contraction of the membrane in the heart-shaped pumping chambers. Combined with the "one-way" micro-valves (fluidic diodes) the pumping action of the micro-pump results.

(STL file "3Dfile2.stl")

4) The fourth layer is a relatively thick (2-3 mm) cast silicone slab that serves both to seal the channels on the back-side of layer 3 and as a "soft-cushion" so that the whole stack can be compressed without producing any air/fluid leaks. This layer is cast in the same way as the silicone membrane of layer 2, just thicker. Also we need to punch 4 holes for the 2 mm screws. To this purpose we once again use a punching mask that I describe later.

5) the last layer is the back-plate which is once again a 32x32x 3.85 mm sized plexiglass plate. It has holes milled for tightening the whole stack with four 2 mm screws.

(STL file "layer5.stl")

Step 3: CAD Files

Here are the CAD files that you will need to import in your CAM software for generating the CNC tool-paths.

besides the plexiglass top-layer plate (layer 1, file "3Dfile1correct.dxf")

PVC layer (layer 3, file "3Dfile2.dxf")

and the plexiglass back-plate (layer 5, file "layer 5.dxf")

also two CAD files for the hole-punch mask are included (files "3Dfile3.dxf", "3Dfile4.dxf")

that you will need to punch holes in the "right" places in the silicone membrane. As punching tools I used flattened nails and a flattened needle tip. As your nails and needles may have different diameters than mine you will probably need to adapt the hole-punching mask CAD files to suit your needs.

Step 4: Preparing the Silicone Membrane

1) casting the silicone membrane:

I first smeared a small glass plate with dish-washing soap and dried the soap with a hair-dyer. You should continue smearing the soap also after the water has dried out until an ultra-thin uniform soap layer develops that practically becomes nearly invisible.

To cast the silicone I use plumbers putty to shape a "wall" so that liquid silicone will stay in place. If you use Silgard184 silicone (Dow Corning) you will need to mix up 1 part "cross-linker" with 10 parts "base compound". It is convenient to prepare several glass plates for casting since you will need only few grams for one membrane. If you want to be sure to get the right thickness measure the casting area, multiply with the desired thickness, multiply the volume by the density of silicone and you get the weight of liquid silicone you will need to cast. Then just put your mold on a balance with at least 0.1g resolution and pour the silicone until you reach the desired weight. Once spread let the silicone sit for at least 30 min so that all air bubbles escape. Then cure on a hot-plate at 80-120 deg C for at least 2 hour so that the silicone is well cured and will not shrink later.

2) punching the holes:

- Mill a "punch-mask" in two plastic sheets. (see CAD files in step 3). I use two 1.2 mm thick CD as plastic layers for the punch mask, after stripping the metal from the CD with scotch-tape.

- Take nails with a diameter matched to the holes in the punching mask (slightly smaller by 0.02-0.03 mm) and flatten them with abrasive paper. For smaller holes (< 1mm) I use flattened needle-tip treated in the same way as the nails.

- Take one of the plates of the punching mask and lay down the silicone membrane. Insert "alignment nails" into the outer alignment holes of the punching mask. Stack the second plate of the punching mask onto the silicone membrane using the alignment nails and alignment holes of the second plate.

- use the punching nails/needles to punch holes manually into the silicone membrane using the holes in the punch-mask.

3) casting and punching the thick silicone slab (layer3):

- casting is done in the same way as for the thin silicone membrane, just use more silicone to make a 2-3 mm slab.

- punching can be done using milled layers 1 and 5 as a punching mask together with a flattened nail as punching tool as described above.

Step 5: Assembling the Micro-pump

Assembling:

The assembling of the device stack requires some skill and attention

1) clean the plexiglass plate layer 1 from dust.

2) clean the punched silicone membrane from dust using scotch tape, tapping repeatedly with the sticky side of the tape on the membrane. Just be careful not to tear the membrane. I find it useful to lay down the membrane on a bigger silicone slab that I have previously prepared and cleaned from dust in the same way with scotch tape. Once you are satisfied with the cleanliness of the membrane place the top layer (layer 1) onto the silicone membrane. Try to align by eye the holes in the membrane with the corresponding features in layer 1 (see CAD files). It helps if this is done using black paper as a background so that you can better see where the holes and features are. Probably you will need to adjust the position of the membrane after it has been laid down on the plexiglass plate. If the membrane gets dirty during this process use the scotch-tape technique to clean the membrane once-again while the membrane rests on the plexiglass plate, eventually lifting up some of its edges and repositioning the membrane until you are satisfied with the alignment and cleanliness.

3) clean the PVC rubber layer 3 from dust (don't use the scotch tape in this case ! Scotch tape will strongly stick to PVC and leave residues). Place the PVC layer onto the previously assembled layers, aligning once again the mating features. I have not included any alignment marks in the design. Such marks could eventually simplify the alignment task.

4) clean the fourth layer - silicone rubber slab - and place it on top of the previous three (simple).

5) clean the fifth layer (plexiglass back-plate) and place it on top of the previous four (simple).

6) finally insert the four 2 mm mounting screws and tighten the nuts finger-tight.

Step 6: Connecting External Components and Testing the Pump

1) Making external connections:

Before you can test the micro-pump you need to connect three small external "air-containers" that act as pneumatic capacitors. Actually the two reservoirs milled on the plexiglass plate (layer 1) were meant to be used as two of these containers but I found they were too small. The containers used should have volumes of some ml. The simplest way is to use three 5 ml syringes. Then you have the additional advantage that you can adjust the volume. Just be sure to fix the syringe plungers in place in some way (glue them for instance).

What is the purpose of these containers you may ask ?

Their purpose is to regulate the "heart-beat" frequency of the micro-pump. Bigger reservoirs act as bigger capacitors and produce lower frequency heart-beat.

I used three 2.5 ml "Eppendorf" vials as external reservoirs as you can see in the picture above, connected to the appropriate holes on the device (see picture and video in the introduction).

With these I get a frequency of about 1-2 beats per second as you can see in the video in step 1 of this instructable. The containers are connected to the device with chunks of small diameter elastic tubing (tygon micro-bore tubing) which forms tight seals with the conical holes milled in the device.

Using smaller reservoirs - such as the two included on the layer 1 plate - will give frequencies of several hertz up to some tens of hertz with even smaller containers.

To start the pump you need to connect a vacuum power supply to the "central hole" - the one centered in the ring shaped channel (see picture and video in the introduction) or a compressed air supply to the unconnected hole in the picture above.

2) Testing:

I must say that the I designed the heart expansion chambers to operate efficiently with vacuum, not with pressure. They also work with a compressed air supply but pumping efficiency is much lower. So test the pump preferably with a vacuum source ! This also reduces risk of air/fluid leaks.

To better see the heart beat you should of course also fill the fluidic part of the circuit with ink. A colored fluid must be injected in the upper right hole with a syringe. The pump then drives the fluid towards the left so that pumped fluid exits the upper left hole. The pumping direction is fixed by the diodes and can't be inverted. You should also connect a tube to the upper left outlet hole so that injected or pumped fluid will be collected inside the tube. Once the fluid has been injected you should also connect the open end of the fluid filled tube to the fluid inlet port so that fluid will be pumped around the circuit (see the video in the introduction).

NOW YOU ARE READY !

Start the vacuum and you should see the hearts beating !

(If you use the DIY "hand-vacuum pump" described in step 2 of this instructable pulling the plunger of the 60 ml syringe plunger will produce a vacuum that will last for some minutes only)

Play with the sizes of external containers (or position of syringe plungers if you use 3 syringes instead of 3 containers) to change the pulsation frequency. Some frequencies produce better pumping action than others, depending also on how much air bubbles are in the fluid circuit. Some air bubbles in the fluid circuit are useful otherwise you cannot see the fluid moving, but not too much. Too much air in the circuit reduces pumping efficiency as in any pump, also macroscopic pumps.

The pump will pump approximately some ml/min but I have not quantified that seriously yet.

have fun !

Comments

author
Kul_Guyz made it!(author)2017-05-11

Awesome project! But I always wonder, is it possible to have a programming language in fluidics? If so, how would it look like?

author
novelchip made it!(author)2017-05-11

Thank you. The answer to your question is yes it is possible and it actually has already started to be developed. Instead of variables you have fluid types and you program operations among fluids like mix a+b or move fluid a to storage location x or more complex commands which are made from lower level ones for intance dilute fluid a with fluid b in 1:4 ratio at precision better than 0.1 etc..how this translated into single commands to operate valves on specific fluidic chips is described in an excellent way in this video of bill thies https://youtu.be/n0gmTc2wA3k
who developed this language called biostream. Its open source but it appears that it has not yet been used a lot. It would really be nice if someone could test it on real chips further.

author
Kul_Guyz made it!(author)2017-05-11

That's actually neat to think of having a programming language in that way. I also have another question, what happens if the fluid type used is ionised, viscous, volatile,etc? Can that change the way the circuit works?

author
novelchip made it!(author)2017-05-11

Of course materials used to fabricate the chip should be compatible with the fluid. Typically microfluidics is used in biotechnology or healthcare applications. Therefore the interesting molecules such as dna or cells or toxins or other that you in the end want to analyze or manipulate by these fluid operations should not be absorbed by the channel walls. Also normally you dont want the fluid to dry out by water vapour penetrating out through the walls. This is a general aspect of proper microfluidics and is not related to the programmability

author
Kul_Guyz made it!(author)2017-05-11

I see. So what really affects the programmability of micro fluidics?

author
novelchip made it!(author)2017-05-11

When using mechanical actuation the main obstacles are probably the reliability of fluid tranfer operations. Because of the possibility of air bubbles for instance or because valve closing displaces liquids to both sides of the valve whereas you would like just to interrupt fluid flow. Also the complexity of chips that need a large number of valves to achieve is one reason why such chips will be hardly commercial. One exception though are chips from fluidigm company that uses large numbers of valves but i think they only carry out simple fluid manipulations but very useful ones so that actually no fluidic programming language is needed. It nevertheless reamains an interesting future prospect of development

author
Kul_Guyz made it!(author)2017-05-11

Thanks, this sparks my interest in fliud mechanics and it might be useful in my future for my thesis‚Äč in aerospace engineering. I can picture this being used in fuel efficiency systems or back up system in case the electronics in the plane fails.

author
novelchip made it!(author)2017-05-11

The source code for BioStream is freely available. For a pointer to the most recent version, please send email to Bill Thies (thies@mit.edu).
For more information on the project see also the following website
http://groups.csail.mit.edu/cag

author
NickM. made it!(author)2017-05-07

When you say pvc rubber... Are you referring to something similar to that of clear vinyl? Pvc and rubber to my understanding are different materials. Where would I obtain this?

author
novelchip made it!(author)2017-05-08

yes clear PVC sheets ..you can buy them for instance on e-bay (http://www.ebay.co.uk/bhp/clear-pvc-sheet). i call it PVC-rubber because they are soft and pliable as allmost silicone rubber and are "rubbery" to the touch but contrary to silicone they are actually heavily "Plasticised" plastics and so can be CNC milled. I did not manage to CNC mill other rubbers so far -- too soft.

author
or_ford98 made it!(author)2015-02-06

This is amazing

Would there ever be a way to make this without a CNC mill or 3D printer? I'd love to make this but don't have access to either of those things. I'd even buy this if I could!

author
cndg made it!(author)2015-02-16

You know - it might be fun to build the 3D mill yourself? An Arduino nano is about $4 from ebay, and you'd need 3 motors, which are about 99cents each, plus some screws and assorted odds and ends - you should be able to build a machine to make these for $10 to $20 if you're resourceful :-)

author
or_ford98 made it!(author)2015-11-03

Hey! I can get my hands on a 3D printer now! I am adding this to my (short) list of doable projects :D Can't wait until I get the other components so I can get it printed

author
novelchip made it!(author)2015-11-04

I suggest you to scale the STL or dxf files at least 2x since they contain some quite narrow channels (0.2-0.3 mm) which are easy to obtain with a CNC mill and a sharp milling bit but probably not with most filament 3D printers.

author
or_ford98 made it!(author)2015-02-21

Pretty much double that price, since I'm in Australia, but nonetheless a cool and fun project

I'll look into it when I have a break from school, thanks for the idea!

I have an arduino lying around though, and a dremel. I'll see what I can do! :D

author
RyanS16 made it!(author)2015-10-23

Hi! I'm trying to recreate this and am having a hard time milling the PVC film. Would you happen to have any information regarding the size of the end mills you used as well as the feeds & speeds? Thanks for doing what you do!

author
novelchip made it!(author)2015-10-24

First of all thanks for trying to reproduce my "gadget". You are right ...milling PVC rubber is not easy. With some effort I finally managed to mill channels and pockets in the PVC rubber using a sharp scoring tool used for milling traces in PCB boards. teh tool is very sharp and has one flute (see picture). I bought it from MJ CNC automation (product code hpt809). My spindle speed was 5000 rpm and the feed 50 mm/min, but I had to mill the same pattern twice and finally strip manually with tweezers some PCB debris that still sticked the channel walls or bottom. I wished I had found a better material but I could not find any. The material needs to be transparent or translucent, elastic and not too soft. Any suggestions are welcome.

Good luck !

Scoring-tool.JPG
author
novelchip made it!(author)2015-02-07

Thanks. Unfortunately not. Even with most 3D printers it will be very difficult unless you make it much bigger. You need a CNC mill.

author
JM1999 made it!(author)2014-09-08

:----: I am speechless! what a work of art!

author
jbmullis made it!(author)2014-09-04

WOW! Fluidics, a blast from the past, the 1960's to be exact. I remember them and working with fluidic logic components in control systems. Interesting project, good work.

author
novelchip made it!(author)2014-09-07

Thanks ! Yes fluidics ! Just modern version of it (microfluidic logic) - using membrane valves to switch flows.

author
gaiatechnician made it!(author)2014-09-04

What sort of pressures are needed to work it? Also, can it work in reverse? Can the heart work the diodes if you get input to the heart? I have a low pressure backyard pneumatic grid project where this type of thing could be integral to the project. Mine started with aquarium bubble pumps supplying the grid. (I mostly use it to pump water around container gardens usin g airlift pumps) So, air generated in a shed from either mains electricity and aquarium bubble pump or by a solar panel/ mini 12 volt air pump combination goes through irrigation tubing to the use area and airlift pumps use the pressure to pump water. The pressure is very low (about 2/3 of a psi) "Power" could also be made with a wind turbine or "reciprocating vane" in the wind. The reciprocating vane or "vibrating grass stem" could pump your silicone heart and pump out air. Or could your heart be used as a "voltage doubler" close to the use point? The little air pumps for solar panels come in 2 main types. The longer lasting ones seem to use a flat membrane similar to your heart and the pump just has a piece of metal or plastic bumping it and depressing the rubber to pump the air. Those flat pieces of rubber might suitable for your application. Brian

author
novelchip made it!(author)2014-09-04

The pressure needed when using a 0.3 mm thick membrane is about
0.3bar=4.3 psi. By using a thinner membrane (0.1 mm or less) I guess I
could reduce the required working pressure to maybe 1 psi. Any pressure
source of this sort could drive the heart beat of course also a
reciprocating pump in the wind. Actually I found out that Theo Jansen's
Strandbeest powered by wind uses the same type of pneumatic oscillator
(a ring oscillator made of 3 inverters...although his inverters use
piston-style valves instead of membrane valves) to drive the motion of
piston muscles and thereby the walking of its amazing "autonomous"
creatures. I don't know exactly how he "accumulates" wind in its plastic
bottle pressure reservoirs. Probably with its wind mill actuating a
reciprocating pump.

author
gaiatechnician made it!(author)2014-09-05

Hey! Thanks so much for the quick reply. I will have to look up Theo Jansen's strandbeest now . I knew about them but didn't know he had this type of thing inside the beast. Perhaps I can work with him... or he might share a little about his diaphragm. I want to make a standard low pressure one that will work with anything reciprocating and generate about 1 psi. 1 psi is enough pressure to push air about 700 mm deep under water (about 27 inches). With a "world record attempt" I got 4 inches of air pressure to pump water about 5 ft high. That was a lift submergence ratio of about 20 to 1. (of course that is near the limit and not efficient). But depending on the application these things need very little power. Brian

author
novelchip made it!(author)2014-09-05

My mistake. Actually he doesn't use pneumatic inverters (or "liars" as he calls them) to drive the motion of the strandbeest - nor are there piston muscles in the beest. Instead he uses the piston valve inverters to build a binary counter circuit, to count the steps of the strandbeest as he explains in his TED talk.

author
ElectroFrank made it!(author)2014-09-03

Could SteeVee be referring to the tiny button type pumps used to inflate some kinds of sports shoes ?

author
novelchip made it!(author)2014-09-05

Yes. Actually I didn't know that some sport shoes had such pump mechanisms installed.

author
ElectroFrank made it!(author)2014-09-05

http://en.wikipedia.org/wiki/Reebok_Pump

author
64Anthonyp made it!(author)2014-08-30

Have you thought of scaling this up and using it in humans? Take it to the makers of artificial hearts. There's something in this that may be useful.

author
novelchip made it!(author)2014-09-05

For sure a problem with it is that needs a vacuum or compressed air
supply and if I scale it up the "air power supply" will become very big.
The advantage is that is makes no noise at all. I thought it could be
nice scaling it up for a kind of fluidic art installation to drive
colored liquid flow in meters of tubing such as the fluidic dress of
"casual profanity"

author
MicioGatta made it!(author)2014-08-31

Great! It could done to teach pupils the circulatory system!

author
novelchip made it!(author)2014-09-05

I like your idea. Thanks !

author
MicioGatta made it!(author)2014-08-31

PS. Voted!

author
SteeVeeGee007 made it!(author)2014-08-30

OMG that's bad ass!! U could also try to make it completely portable and use those small button type things ( can't think of what they're called) and glue them on so it can pump air by simply pushing them!!

author
novelchip made it!(author)2014-09-05

A friend of mine suggested me a similar
idea ..using some kind of "push-button" air-chamber so that by pushing
on it you create a pressure or vacuum that could be used to drive the
hart-beat at least for a few minutes...just to show off the effect.

author
Machine made it!(author)2014-09-01

Very nice instructable, thanks for showing us.

I'd like to make or find a one-way valve for storing vacuum from a vacuum pump so I can store up vacuum for a pick-up tool for small electronic components - any suggestions, please?

author
novelchip made it!(author)2014-09-05

There appear to be lots of instructables on how to make check valves
(one-way valves) or you just buy one. My check valves are integrated in
the "chip" and are probably not as easy to make as others that I found
on instructables. I have not explained them. You can however look on how
they are made by looking at the CAD or STL files. The design stems from
scientific literature on check valves in microfluidic devices. So
probably its overkill for you. You don't need microvalves in your case.

author
iceng made it!(author)2014-09-02

I am Czech and like your very creative micropump and of course the valves ;-)

author
novelchip made it!(author)2014-09-05

I must say that the valve design is not my own. It is "copied" from
scientific literature. What I did is fabricating them with
unconventional methods. Usually scientists make them using much more
sophisticated "photo-lithographic" techniques - those used to make
microprocessors and ICs - rather than CNC milling. Also the heart pump
chambers are my original design.

author
M4n0v3y made it!(author)2014-09-03

I wonder if I use a bistable circuit ( based in a LM555 for instance), I could control a pump cycle using two speakers ( the part with the coil, membrane and magnetic). I could glue each silicon membrane in each membrane of the speaker and, when I turn on the circuit that will push and pull the membranes to make the pump circuit work.

* sorry for my poor English. :)

author
novelchip made it!(author)2014-09-05

Yes ! If you manage to attach the coil or magnet to the membrane (you
need to glue the silicone membrane to the coil or speaker using liquid
silicone..other glues don't stick to silicone usually) then it will
work. Something along these lines has been done by some researchers.
That's a good idea ! Then you don't need anymore a external vacuum or
pressure source and you can make the gadget fully portable I guess. Good
luck.

author
sonicase made it!(author)2014-09-03

cool

author
crispernakisan made it!(author)2014-08-31

This is crazy cool!

author
novelchip made it!(author)2014-08-31

Thanks for liking it

author
dpizetta made it!(author)2014-08-31

Amazing !

author
NYCitySlicker made it!(author)2014-08-31

Wow. Unreal, great job!!!

author
Bullock+STEAM+MakerSpace made it!(author)2014-08-31

really great!

author
prince+link made it!(author)2014-08-31

I see this and think Doctor Who. Binary Heart Circulatory system. Just Awesome.

author
Jan_Henrik made it!(author)2014-08-31

Thats awesome!

author
watchmeflyy made it!(author)2014-08-30

WOW; amazing!

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Bio: I like and admire unconventional technical solutions, beauty in all its forms, the courage of speaking the truth, understanding the laws of nature and making ... More »
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