Controlling a machine using +5 volts.. (mostly new to this stuff)

Sep 17, 2006 3 Replies

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barto.il.perso 19 years ago

Hi there, I've been looking around all day for ways to control a 12 or

24 volt circuit through the use of a computer parallel port. The key things I'm looking for in it are the ability to handle up to 20 amps (fuse protected, of course), low cost, and small size. For more info as to what it's for, check out my group on Google:

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Thanks in advance Lindsay

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Genome 19 years ago

Bugger, no chance of meaningful artificial intelligence then.....

DNA

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Tim Wescott 19 years ago

Look up "solid state relay", see if you find anything that'll do. If that won't then you'll either need to boost the current from the parallel port before it drives the SSR, or you'll need to pitch the SSR entirely and start learning how to make an itty bitty bit of current into a great big flood of current.

Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ "Applied Control Theory for Embedded Systems" came out in April. See details at http://www.wescottdesign.com/actfes/actfes.html

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Don Foreman 19 years ago

Logic level MOSFET's are designed to do this.

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One example: IRL1404Z would easily switch considerably more than 20 amps with logic-level drive. About $3.50 in onesies.

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