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I need two state linear actuator. You can have a look at the picture to understand what I mean.

Don't care about the hand !

mit inform project
(source: robaid.com)

I need to electrically move the things like this squares up and down. Bidirectional linear actuators are needed. What is the cheapest and tiniest actuator (or sth else) that I can use to move this squares up and down. There are just two states ('up','down'). Don't care how much higher a square rises, when it is up.

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    $\begingroup$ The question isn't clear. Presumably a user uses a finger to press a button. What is the "two state linear actuator" supposed to do? Also, what's the bigger picture? Ie, what is your overall goal? $\endgroup$
    – James Waldby - jwpat7
    Commented Sep 21, 2014 at 1:11
  • $\begingroup$ Updated the question $\endgroup$
    – gungor
    Commented Oct 10, 2014 at 23:35

2 Answers 2

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What you are looking for is called a solenoid.

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  • $\begingroup$ Short and to teh point, Ian :-) $\endgroup$
    – Andrew
    Commented Oct 23, 2014 at 10:13
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The problem is simple if you are using a coil and a pin (solenoid) but the size (diameter) of the coil would be the limiting factor to how closely your pins could be nested. Pneumatics (pressure= up and vacuum = down) could also be used and achieve a tighter nesting. The valve configuration would be the limiting factor with pneumatics.

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