Just out of curiosity...is there anything you *don't* know? -- William Sutton
On Tue, 20 Feb 2007, Aaron S. Joyner wrote: > Scott Chilcote wrote: > > Hi Folks, > > > > I have a piece of equipment that has an internal 2.5" IDE drive > > (notebook size). It would be very useful to have an LED that shows > > drive activity, and there is a place on the cabinet for one. > > > > Has anyone seen a wiring diagram or a cable sold anywhere that would let > > me attach an activity LED to a drive this size? > > > > Thanks, > > > > Scott C. > > So I don't know what your application is, if it's a PC or what. You say > "notebook size", which leads me to believe it's not a notebook... > > Typically there is a pair of pins on the motherboard that provide > something that might be called an "IDE Activity" light, which you can > hook up a standard 0.100" centered jumper pin to, with an LED on it. > These could be scavenged from most any old PC case, or also assembled > from parts via Mouser or Digikey. It'd be better to just ask around > before the next meeting, surely someone on this list can cannibalize an > old case and give you an appropriate LED and cable. > > If on the other hand, you don't have a motherboard involved, and want an > answer to your actual question... > > General consensus from some Googling around seems to indicate that on a > standard 40-pin IDE connection, it's pin 39. The extra 4 pins on a 2.5" > hard drive are for power and I think a master/slave setting, so they > shouldn't matter for purposes of this discussion. If you're comfortable > with a soldering iron inside the case in question, tapping into the pin > shouldn't be too hard. This diagram will probably get you started: > > http://www.pjrc.com/tech/8051/ide/ide-sch.gif > > It's part of this article about using an IDE hard drive with an 8051 chip; > http://www.pjrc.com/tech/8051/ide/ > > Note the 470 Ohm resistor in series with the LED. Note: according to > the diagram the pin sinks current, as opposed to sourcing it, as I would > have sort of expected. > > Best of luck, let us know how it turns out! > Aaron S. Joyner > -- TriLUG mailing list : http://www.trilug.org/mailman/listinfo/trilug TriLUG Organizational FAQ : http://trilug.org/faq/ TriLUG Member Services FAQ : http://members.trilug.org/services_faq/
