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A Lighting Question


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#1 gcskate27

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Posted 07 April 2004 - 06:44 PM

is there a way to have a set of leds light up only when both devices are active?

i want to have one set of lights for hdd activity, one for network activity, and a third set for when both are active... possible?

can anyone point me in the right direction?

thanks in advance wink.gif

#2 bleugh

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Posted 08 April 2004 - 06:20 AM

in basic electronic terms, you need an AND or a NAND
Gate


something like 74LS00 or 74LS01 (NAND Gates)

or

74LS08 or 74LS09 (AND Gates)


Excellent Logic gate basics page


an AND gate will only give an output when it gets inputs on BOTH it's inputs
a NAND gare will only give an output when BOTH its inputs are off


so, wire your HDD LED and Network LED to the inputs, and wire another LED to the outputs!




#3 gcskate27

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Posted 08 April 2004 - 02:35 PM

thanks for the info... looks like ive got reading to do... why cant actual school be this much fun? wink.gif

#4 Himura

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Posted 08 April 2004 - 05:54 PM

AND Gate Truth Table
(A & B are inputs, Y is output)


A B Y
0 0 0
0 1 0
1 0 0
1 1 1


NAND is Opposite. N= NOT (Invert)

Oh and btw, school IS that much fun since im in the engineering program at mine biggrin.gif

Edited by Himura, 08 April 2004 - 05:55 PM.





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