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    Car battery to parallel port

    Thanks again MP for your time (and patience) :-) One more: How would a LM7805 fare in a running car? If I read the voltage on my car while it is running, it goes from 11v to 14v, depending if the air conditioner/stereo or whatever is turned on or not. Would the LM7805 need a decoupling...
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    Car battery to parallel port

    Hello. MP: I just need to know if a switch that's connected to a car battery is on, or off. So basically just knowing if the battery/switch is outputting anything will do fine. If I'm not mistaken, a 5v on a (few) certain parallel port pins will give me a "high" reading, right? So basically...
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    Car battery to parallel port

    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...
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