Subject:
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Re: MERLIN valves & sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 5 Sep 2004 16:12:19 GMT
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Viewed:
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934 times
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In lugnet.robotics, Pete Sevcik wrote:
> In lugnet.robotics, Joe Strout wrote:
> > A company in the UK makes electronically controlled proportional air valves
>
> ...Even without the current limit problem, you will have
> short battery life. Also, you will need 4 of these valves to emulate a Lego
> mechanical air switch.
Did you catch that these are *proportional* air valves? A LEGO mechanical air
switch is not proportional, is it? (Genuine question -- I haven't gotten my
hands on one yet, so I could be mistaken about that.)
> My opinion - a better solution is
> http://www.techno-stuff.com/AirSol.htm
> but then, I am biased.
Those are cool, but they only operate correctly up to 15 psi, which really isn't
enough for some applications. Also I find them a bit pricey. But anyway, more
options is always better...
Best,
- Joe
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Message has 1 Reply:
 | | Re: MERLIN valves & sensors
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| (...) LEGO switches certainly aren't proportional - but I question the value of proportional pneumatic controls. The pressure either side of the valve will equalize very rapidly even if the control is opened only a small amount. Proportional valves (...) (20 years ago, 5-Sep-04, to lugnet.robotics)
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Message is in Reply To:
| | Re: MERLIN valves & sensors
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| (...) I have not looked at the spec sheets, but the web page says 500 mA at 5 volts. The valve will probably draw 900 mA at 9 volts, which is past the current limit of an RCX motor port. Even without the current limit problem, you will have short (...) (20 years ago, 4-Sep-04, to lugnet.robotics)
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