Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Foo Off-Topic chit chat with no general subject.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-01-06, 07:24 PM   #1
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Any way to know what voltage the parallel port is emitting?

I have an application in which I need to utilize the 5vDC pulses which your parallel port can emit. However I am told that some computers only emit 3v. Is there any way to tell, without a volt meter? THis does not sound like something manufacturers would advertise.
phantomcow2 is offline   Reply With Quote
Old 08-01-06, 07:25 PM   #2
jschen
riding once again
 
jschen's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Bikes: '06 Cervelo R3, '05 Specialized Allez
Posts: 7,359
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Why not use a voltmeter? They're not that hard to use, and it can't possibly be that hard to get a hold of one for a few seconds.

[EDIT] Given your interests, you probably should get yourself a decent multimeter at some point anyway.
__________________
If you notice this notice then you will notice that this notice is not worth noticing.
jschen is offline   Reply With Quote
Old 08-01-06, 07:31 PM   #3
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Its not htat I have a problem using my multimeter. But I have a laptop coming sometime soon, and want to know if it emits the 5v I need. If it only emits 3, I have to buy a small electrical circuit which will bump it up to the full 5v, as well as optoisolate my port. I'de like to have these coming at about the same time. Impatient, yes I know .
phantomcow2 is offline   Reply With Quote
Old 08-01-06, 07:33 PM   #4
jyossarian
SERENITY NOW!!!
 
jyossarian's Avatar
 
Join Date: Aug 2005
Location: In the 212
Bikes: Haro Vector, IRO Rob Roy, Bianchi Veloce
Posts: 8,756
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ever lick a 9v battery? well, 3v will feel 2/3 less tingly and 5v will feel about 1/2 as tingly.
__________________
HHCMF - Take pride in your ability to amaze lesser mortals! - MikeR



We demand rigidly defined areas of doubt and uncertainty!
jyossarian is offline   Reply With Quote
Old 08-01-06, 07:34 PM   #5
jschen
riding once again
 
jschen's Avatar
 
Join Date: Oct 2005
Location: San Diego, CA
Bikes: '06 Cervelo R3, '05 Specialized Allez
Posts: 7,359
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by phantomcow2
Impatient, yes I know .
Yes, and a surprisingly good excuse. If it's a used laptop, I wouldn't trust anything other than a direct measurement. A spec like that may well change over the course of a model line without careful documentation. If it's new, demand an answer from tech support. (Do any new laptops still have parallel ports?)
__________________
If you notice this notice then you will notice that this notice is not worth noticing.
jschen is offline   Reply With Quote
Old 08-01-06, 08:17 PM   #6
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
. I hate to say it, but I agree with you. I am just going to measure it. Or to avoid fussing with a voltmeter, test it out. If 5v is present, a stepper motor will go. If not, no go.
It is used, but I dont expect that the 5v would change any. That is just a transformer and bridge rectifier, power supplies last a long time. The 400mhz P2 in my basement still puts out a good 5v.
phantomcow2 is offline   Reply With Quote
Old 08-01-06, 08:27 PM   #7
iluvfreebeer
Riding behind enemy lines
 
iluvfreebeer's Avatar
 
Join Date: May 2005
Location: Occupied Texas
Bikes: Orbea, Trek, Cadex, Colnago, Schwinn, Specialized, Poghliaghi, Kellog, KHS, Kellog, Litespeed
Posts: 408
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Oscilloscope
__________________
------------------------------------

Armstrong never got caught cheating.
That probably makes him as good a cheater as a cyclist.

-- Some guy at the Dallas Crits
iluvfreebeer is offline   Reply With Quote
Old 08-01-06, 08:28 PM   #8
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by iluvfreebeer
Oscilloscope
Oh yea, I forgot about that. I was wanting to buy one of those things.
phantomcow2 is offline   Reply With Quote
Old 08-01-06, 09:06 PM   #9
sabretech2001
Senior Member
 
Join Date: Jun 2005
Location: NYC
Bikes: Road and Fix, Tutto Campagnolo, certo!
Posts: 145
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Check the manufacturer's website. My experience with IBM, hP, Toshiba, Sony, Dell and Compaq is that there will be a chart near the back of the User Manual which will let you know which pin does what. They usually toss that in there instead of really useful information, such as how to upgrade the CPU and/or HDD.

Have you thought about using the USB port to get the voltage you need?
sabretech2001 is offline   Reply With Quote
Old 08-01-06, 09:27 PM   #10
KingTermite 
On my TARDIScycle!
 
KingTermite's Avatar
 
Join Date: Jun 2005
Location: Eastside Seattlite Termite Mound
Bikes: Trek 520, Trek Navigator 300, Peugeot Versailles PE10DE
Posts: 3,924
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Pinout:
http://www.doc.ic.ac.uk/~ih/doc/par/

More pinout and reference that PP uses TTL logic levels:
http://www.interfacebus.com/Design_C...r_PinOuts.html

TTL Logic Levels Link (from above):
http://www.interfacebus.com/voltage_threshold.html
__________________
Quote:
Originally Posted by coffeecake View Post
- it's pretty well established that Hitler was an *******.
KingTermite is offline   Reply With Quote
Old 08-02-06, 04:21 PM   #11
phantomcow2
la vache fantôme
Thread Starter
 
phantomcow2's Avatar
 
Join Date: Aug 2004
Location: NH
Bikes:
Posts: 6,266
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Well pons 1-18 will be used to give step and direction pulses, just bursts of the 5v. Two will be used to control a 25amp relay, its okay for these pulses to be 3v. RElay will operate with 3-32vDC.

I could use the USB as a source of 5v, but this will not rectify the signals produced by the parallel port so that they are 5v. I could use the usb as a source for a circuit which will rectify the signals, using the input voltage of the USB to bump it up to the 5. I think its called a hex inverter circuit. I am just going to guess that this produces 5v, its easy to test. I dont want to buy this extra circuit because it optoisolates the printer port.
phantomcow2 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 03:45 PM.