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Author Topic: 5v to 12v relay?  (Read 1144 times)
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Hi everyone i just recently purchased the Arduino Duemilanove, and i know the out put is 5v from the i/o's and i was looking to hook these up to some kind of relay so i could hook up roughly 40-50 10mm leds to each channel and have them stobe in quad flashes like police car i have a 12v 7.2 amp hours source to power the leds...any help would be much appreciated.
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In this case motors and LEDs are the same sort of load:-
http://www.thebox.myzen.co.uk/Workshop/Motors_1.html
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Don't directly connect the relay to the pin, you need some sort of buffering.
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okay looked at that tutorial and could only read bits and pieces as the pic for some reason were covering info...and also what kind of buffering? and i seen i could use a transistor?
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Yes a transistor, or something like a ULN2803A which is like 8 transistors in one package.
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and could only read bits and pieces

Sorry you must have an old browser.

Try this:-
http://www.kpsec.freeuk.com/trancirc.htm
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http://www.phoenixcontact.com/signal-level-matching/31255_31384.htm
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you prob dont need the relay, just the transistors should be enough. just make sure the ones you get are rated for the current and voltage you want.
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