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Grounding 5v or 12v

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Scarr

Member
Hi,
I want to have a 5v or 12v output on my car project that when grounded I can detect it and not burn anything out, I have a PIC MCU for the logic side whats the simplest way?

Thanks
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Scarr said:
Hi,
I want to have a 5v or 12v output on my car project that when grounded I can detect it and not burn anything out, I have a PIC MCU for the logic side whats the simplest way?

Thanks

How much current do you need to be able to draw from it?, the simplest way would be a series resistor - but it would also have the worst performance. Simple current limited voltage regulators (like the 7805) would make 1A available, but you couldn't use a 7812 for 12V (not enough input voltage).
 

Noggin

Member
Umm... you mean that if your 5v or 12v line touches ground you want it to shut off? Just put a fuse on it.. or am I missing something?
 
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