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Topic: LED problem (Read 1 time) previous topic - next topic

pranoy

pls guys someone reply pls pls

suicidalacorn

ok, i am no expert when it comes to this stuff, so take what i say with a grain of salt. but if i had to guess, the ground from one of your LEDs is activating your AND gate. take a look at the diagram i attached. that is my guess what is happening. but again, i could be completely wrong. im just letting you know what my guess is when it comes to this problem.

JimboZA

My take is slightly different from that of suicidalacorn's... I think that with either 01 or 10 and therefore activating the R xor G LEDs, there's enough of a "short" across the AND gate for it to read both its inputs as 1's.

(Which is what suicidalacorn was saying, on second thoughts, now that I see his annotated pic....)

Do some measuring with your meter...
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

pranoy

thanks for your reply.

but can you give me a suggestion to stop this?????

JimboZA


but can you give me a suggestion to stop this?????


Lose the 74' and do the whole thing in software....
Roy from ITCrowd: Have you tried turning it off an on again?
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

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