Grounding 5v or 12v - Electronic Circuits Projects Diagrams Free

Scarr · 9th December 2003, 01:19 PM

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** · 9th December 2003, 01:47 PM

Quote:

Originally Posted by Scarr

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 · 10th December 2003, 04:54 AM

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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9th December 2003, 01:19 PM	(permalink)
Scarr	Grounding 5v or 12v 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

10th December 2003, 04:54 AM	(permalink)
Noggin	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? __________________ A rectangular bear is just a polar bear after a coordinate transform. -- I dunno who. A recent study shows that research causes cancer in rats. -- I dunno who said that one either.