TJBraza Posted June 4, 2007 Report Share Posted June 4, 2007 Hello friends. I'm a newbie at the forum and (very much) a newbie at electronics. I intend to monitor a car battery's status (live or dead) using the PC's parallel port. From the looks of it, the inputs on a parallel port work at 5v, so I'd have to put at least one resistor to drop the battery's 12v to 5v so the port's input will give me a "live" reading. My problem is that the battery has 60amps and I don't know how to connect that to the pc's parallel port and not fry the port. In my understanding, I have to connect the (reduced to) 5v positive from the battery into a (non inverted) input pin on the parallel on the pc, and the ground from the battery on one of the ground pins on the parallel port. But if I do that, won't I instantly fry the board (and my computer too)? How should I go about this?Thanks for any input! Quote Link to comment Share on other sites More sharing options...
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