RunicSheep
Posts: 2
Joined: Thu Jul 09, 2015 10:35 pm

Small Piston like component

Thu Jul 16, 2015 4:53 pm

Hi!

I've currently a specific idea in mind, but struggle to find the correct parts.
I'm searching a component that works like a piston, but it needs to be very small (width, height isn't a problem) because i need some one to another.

I made some sketches which hopefully can explain what i'm trying to do. (pin means a metallic pin, which can be pushed upwards (max. 1cm).)

Image
Image


(sry for my bad english, i'm not a native speaker ^^)

Heater
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Re: Small Piston like component

Thu Jul 16, 2015 6:01 pm

Hi RunicSheep,

It's hard to know what you mean but it sounds like you want a matrix of pins that can spring in and out to make electrical contact with something.

Maybe like these "pogo pins": http://www.adafruit.com/products/394

I suspect you can get them for a lower price at other places.
Memory in C++ is a leaky abstraction .

W. H. Heydt
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Location: Vallejo, CA (US)

Re: Small Piston like component

Thu Jul 16, 2015 6:23 pm

Another possibility... Small push-button momentary contact switches.

gordon77
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Re: Small Piston like component

Thu Jul 16, 2015 6:44 pm

Solenoid?

mung
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Re: Small Piston like component

Thu Jul 16, 2015 8:01 pm

gordon77 wrote:Solenoid?
Although a solenoid first springs to mind, you would have to not be blind not to not see that what the OP was envisioning is a tactisplay http://www.tactisplay.com/product/tactisplay

My brail is a little rusty since I borrowed geordie la forges visor but I can feel something leading to an interesting blog post not sure google can pin it down yet though.

gordon77
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Re: Small Piston like component

Fri Jul 17, 2015 8:47 am

mung wrote:
gordon77 wrote:Solenoid?
Although a solenoid first springs to mind, you would have to not be blind not to not see that what the OP was envisioning is a tactisplay http://www.tactisplay.com/product/tactisplay

My brail is a little rusty since I borrowed geordie la forges visor but I can feel something leading to an interesting blog post not sure google can pin it down yet though.
" ..you would have to not be blind not to not see.."

Maybe that's why I didn't see it ? ;)

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startrek.steve
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Re: Small Piston like component

Fri Jul 17, 2015 12:35 pm

Braille keyboards do this, might not be cost effective though...

https://www.google.com/search?q=braille ... 48e6CwU%3D
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boyoh
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Location: Selby. North Yorkshire .UK

Re: Small Piston like component

Fri Jul 17, 2015 7:34 pm

I think Gorden77 is correct using solenoids
That is what came to my mind
The poster's lack of English , and electronics
made it hard to understand what he want's
I think he want's to use three solenoids controlled
be three GPIO out/puts. Depending on the voltage
and current of the solenoids , he might need to
buffer the out/puts. First we must know exactly
what he want's to do, a better circuits diagram
would be help full
BoyOh ( Selby, North Yorkshire.UK)
Some Times Right Some Times Wrong

BMS Doug
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Re: Small Piston like component

Fri Jul 17, 2015 8:07 pm

boyoh wrote:I think Gorden77 is correct using solenoids
That is what came to my mind
The poster's lack of English, and electronics made it hard to understand what he wants
I think he want's to use three solenoids controlled by three GPIO out/puts. Depending on the voltage and current of the solenoids, he might need to buffer the outputs.
First we must know exactly what he want's to do, a better circuits diagram would be helpfull
I don't think that the OP's post was that unclear, he want's to produce a tight grid of pins that will raise or lower by no more than 10mm, the amount of space taken up below the grid is unimportant to the OP.

As mung says, the OP is trying to make something functionally identical to a tactisplay.

The OP probably doesn't know how to wire this up, which maybe one of the reasons why he is asking for help.
Doug.
Building Management Systems Engineer.

boyoh
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Location: Selby. North Yorkshire .UK

Re: Small Piston like component

Fri Jul 17, 2015 10:45 pm

mung wrote:
gordon77 wrote:Solenoid?
Although a solenoid first springs to mind, you would have to not be blind not to not see that what the OP was envisioning is a tactisplay http://www.tactisplay.com/product/tactisplay

My brail is a little rusty since I borrowed geordie la forges visor but I can feel something leading to an interesting blog post not sure google can pin it down yet though.
I don't think the solenoid suggestion was out of place
In the operation of the Tactisplay thy use
SOLENOID ACTUATORS to raise and lower the Pins
BoyOh ( Selby, North Yorkshire.UK)
Some Times Right Some Times Wrong

boyoh
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Location: Selby. North Yorkshire .UK

Re: Small Piston like component

Fri Jul 17, 2015 10:57 pm

BMS Doug wrote:
boyoh wrote:I think Gorden77 is correct using solenoids
That is what came to my mind
The poster's lack of English, and electronics made it hard to understand what he wants
I think he want's to use three solenoids controlled by three GPIO out/puts. Depending on the voltage and current of the solenoids, he might need to buffer the outputs.
First we must know exactly what he want's to do, a better circuits diagram would be helpfull
I don't think that the OP's post was that unclear, he want's to produce a tight grid of pins that will raise or lower by no more than 10mm, the amount of space taken up below the grid is unimportant to the OP.

As mung says, the OP is trying to make something functionally identical to a tactisplay.

The OP probably doesn't know how to wire this up, which maybe one of the reasons why he is asking for help.
I don't think the solenoid suggestion was out of place
In the operation of the Tactisplay thy use
SOLENOID ACTUATORS to raise and lower the Pins
BoyOh ( Selby, North Yorkshire.UK)
Some Times Right Some Times Wrong

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sommersoft
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Location: Delaware, US

Re: Small Piston like component

Fri Jul 17, 2015 11:24 pm

I don't have much experience with solenoid types, but this seems like it may be what gordon was talking about?

Digikey: http://www.digikey.com/product-detail/e ... ND/5214011
Datasheet: http://www.deltaww.com/filecenter/Produ ... L-0224.pdf

Push type, about 34mm at extended position. $9.22 per though, so not cheap for a full Braille reader.
"We mock what we don't understand." - Dr. Trowbridge

mung
Posts: 506
Joined: Fri Nov 18, 2011 10:49 am

Re: Small Piston like component

Sat Jul 18, 2015 12:20 am

Did anyone say a solenoid was out of place?

But the whole question is moot unless the 'small width' requirement is given some actual precise value!

I would guess the best thing to do would be wind your own solenoids, its quite simple just get some enameled copper wire, wax paper, sticky tape and a former and a variable speed drill.

I am guessing a very small matrix of solenoid coils would need you to design your own custom coils to get the size and force required?.

If you want off the shelf solenoids try http://www.lineelectric.com/solenoids/wssolenoid.html

I am not sure all brail terminals use solenoids?

As alternatives that may give a tighter packed matrix you could try pneumatics, hydraulics, electro statics, or piezo electrics(there are some other actuator technologies available). If you want very narrow pitch between rows/columns try google for "micro valve matrix piezoelectric actuators"

ryecomp
Posts: 1
Joined: Sat Jul 18, 2015 3:09 am

Re: Small Piston like component

Sat Jul 18, 2015 3:13 am

tactisplay product (http://www.tactisplay.com) will have little stroke, around 1mm. it's for
braille sensation.

If you want rather greater stroke, how about tactile display from mit ?
https://www.youtube.com/watch?v=lvtfD_rJ2hE
Last edited by ryecomp on Sat Jul 18, 2015 10:59 pm, edited 1 time in total.

boyoh
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Location: Selby. North Yorkshire .UK

Re: Small Piston like component

Sat Jul 18, 2015 9:54 am

gordon77 wrote:Solenoid?
Gordon good news, you are not BLIND
Your suggestion of a SOLENOID is correct.

Tactisplay use SOLENOID ACTUATORS
To raise and lower the pins.
I think , you should get a apology
BoyOh ( Selby, North Yorkshire.UK)
Some Times Right Some Times Wrong

RunicSheep
Posts: 2
Joined: Thu Jul 09, 2015 10:35 pm

Re: Small Piston like component

Sat Jul 18, 2015 3:02 pm

Hi guys,

sry for the late response,
yes it's true i had something like tactisplay in mind :D

Didn't know it already exists though hehe.

Thanks for all the responses, i think they lead me to the right direction, thanks folks! :)

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