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Author Topic: Random or Pseudorandom blinking  (Read 5045 times)

Allanmenef

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Random or Pseudorandom blinking
« Reply #20 on: September 22, 2003, 04:51:55 PM »

Thanks.  The specs say that parallel voltage is 5vdc, but it is somewhat lower on many computers.  Not that it matters for most devices, since they only use it as a signal, not as power.  As I said, the LED did light with a 10k resistor.
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Skylined

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Random or Pseudorandom blinking
« Reply #21 on: September 22, 2003, 04:55:16 PM »

My experience is that it's 3.3V, but it is said that it is 5V, so you should better check your own prallel port.

Set you multitester to DC 20V.
Put one of the leads at the port and the other touching a screw of your case.
Be careful, you may be given a "0V" because that pin is in "0" state, if you get a voltage then that pin is in "1" state.
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Allanmenef

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Random or Pseudorandom blinking
« Reply #22 on: September 23, 2003, 10:53:32 AM »

I see why my tester was cheap, it registered at 10v!?!?!  That can't be right.  Anyway, if I assume it is 5v and use a resistor according to that, it should be safe, right?  

Skylined:  Actually, pin 1 is "strobe" which for some reason defaults to 1.  I used pin 1 and pin 25 to test.  I'll let you all know what happens.  If I blow it up, it's only a cheap old IBM thinkpad.

Allan
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PetaHertz

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Random or Pseudorandom blinking
« Reply #23 on: September 23, 2003, 11:32:29 AM »

I wouldn't assume anything.  Maybe borrow a friends multimeter or something.
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Skylined

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Random or Pseudorandom blinking
« Reply #24 on: September 23, 2003, 12:23:02 PM »

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Allanmenef

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Random or Pseudorandom blinking
« Reply #25 on: September 23, 2003, 01:41:45 PM »

Well......if I had friends with multimeters, I would be fine, but I don't. :)  Anyway, Right now I don't have the actual PC it will be used for, since it is not built yet.  So building the lights to the specifications of the laptop might be a bad idea.
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