Alt-BEAM Archive
Message #06079
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Tue, 14 Sep 1999 18:00:19 -0700
Subject: [alt-beam] Re: Z Bridge
Hi ZUlu,
Depends on whether you use it to drive a motor directly or connect it to an
h-bridge as the motor driver. If used directly , a 74HC139 can only supply
about 10-20ma with significant voltage drop. Not enough for most
applications. You probably need a 74AC139 and preferably connect the two
sections together to double the current. That way you can handle 70-100ma of
motor current with little voltage drop which is enough to drive a small
motor. With an h-bridge for motor driver you can use a 72HC139 and drive
bigger motors.
regards
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> -----Original Message-----
> From: Zulu [SMTP:zulu35@singnet.com.sg]
> Sent: Tuesday, September 14, 1999 8:56 AM
> To: BEAM
> Subject: Z Bridge
>
> hello all...
>
> thanks for the advice on how to convert the image files. :P guess i will
> have to download something like that soon...
>
>
> one question.. for the Z bridge, will it be alright to use a 74HC139P ?
> cant get those F or S ones..
>
>
>
> rdgs
> ZUlu
>
>
> The Difference between interest and committment
> is that when you are interested in something, you
> do it only when its convenient. When you are
> committed to something, you accept only results,
> no excuses ----- Kenneth Blanchard -----
>
6080 Tue, 14 Sep 1999 18:06:31 -0700 [alt-beam] Re: LED Screen Anyone? "'beam@sgiblab.sgi.com'" Wilf Rigter Also check out this LCD discussion group hosted by EIO.
http://eio.com/public/lcd/
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> -----Original Message-----
> From: Ed Spike [SMTP:spike@engmail.uwaterloo.ca]
> Sent: Tuesday, September 14, 1999 1:20 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: LED Screen Anyone?
>
> Can you send me an address or URL for BG micro?
> Thanks
> 73
>
> James Taylor wrote:
> >
> > You are possibly thinking LCD. LED screens have only
> > recently started appearing (with the invent of the
> > blue LED) Control is rather simple, and if you look
> > in any BG micro catalog, their is a controller or 2
> > listed that uses PIC.
> >
> > --- SG wrote:
> > > anyone ever do any work with LED screens?
> > > i have two 6" ones (VDC) and i was thinkin of
> > > trying something.
> > > i know nothing about what kind of driver
> > > or component board would be needed,
> > > i want:
> > > to run a small floppy drive
> > > display a txt file from the floppy disk on the LCD
> > > screen.
> > >
> > > would i need a whole computer (mother board, vid
> > > cards etc.)
> > > to do this?
> > > or is it possible to do this from a Stamp II or PIC?
> > > OR: arn't they selling small XT (comparable) like
> > > computers
> > > that are small sized now?
> > >
> > > before i get flamed....
> > > yes, this is for a robot application.
> > >
> > > just email me directly (sparkyg@seark.net) if you
> > > can help, don't wanna
> > > clutter up the list with this.
> > >
> > > -Sparky
> > >
> > >
> > >
> > >
> >
> > ===
> > Everything I say can mean one of two things...If something I say makes
> you mad....I meant it the other way.
> >
> > James Taylor
> > URL: http://fly.to/springmeadows
> > __________________________________________________
> > Do You Yahoo!?
> > Bid and sell for free at http://auctions.yahoo.com
6081 Tue, 14 Sep 1999 19:11:03 -0700 (PDT) [alt-beam] Re: LED Screen Anyone? beam@sgiblab.sgi.com James Taylor http://www.bgmicro.com
last time I checked
--- Ed Spike wrote:
> Can you send me an address or URL for BG micro?
> Thanks
> 73
>
> James Taylor wrote:
> >
> > You are possibly thinking LCD. LED screens have
> only
> > recently started appearing (with the invent of the
> > blue LED) Control is rather simple, and if you
> look
> > in any BG micro catalog, their is a controller or
> 2
> > listed that uses PIC.
> >
> > --- SG wrote:
> > > anyone ever do any work with LED screens?
> > > i have two 6" ones (VDC) and i was thinkin of
> > > trying something.
> > > i know nothing about what kind of driver
> > > or component board would be needed,
> > > i want:
> > > to run a small floppy drive
> > > display a txt file from the floppy disk on the
> LCD
> > > screen.
> > >
> > > would i need a whole computer (mother board, vid
> > > cards etc.)
> > > to do this?
> > > or is it possible to do this from a Stamp II or
> PIC?
> > > OR: arn't they selling small XT (comparable)
> like
> > > computers
> > > that are small sized now?
> > >
> > > before i get flamed....
> > > yes, this is for a robot application.
> > >
> > > just email me directly (sparkyg@seark.net) if
> you
> > > can help, don't wanna
> > > clutter up the list with this.
> > >
> > > -Sparky
> > >
> > >
> > >
> > >
> >
> > ===
> > Everything I say can mean one of two things...If
> something I say makes you mad....I meant it the
> other way.
> >
> > James Taylor
> > URL: http://fly.to/springmeadows
> > __________________________________________________
> > Do You Yahoo!?
> > Bid and sell for free at http://auctions.yahoo.com
>
===
Everything I say can mean one of two things...If something I say makes you mad....I meant it the other way.
James Taylor
URL: http://fly.to/springmeadows
__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com
6082 Tue, 14 Sep 1999 22:42:01 -0400 [alt-beam] Re#2: LED Screen Anyone? beam@sgiblab.sgi.com SG hey Steve, I changed my mind...
be too hard to figgure out an unknown LCD display with no specs.
lets werk with the 3" X 2" (model number MEG12864) display sold by Jameco
at:
http://www.jameco.com/cfm/viewdesc.cfm?part_num=163176
the specs are available at:
http://www.microelect.com/lcd.htm
(the manufacturer)
that way we know what to deal with. Remember.. all i want is to read a txt
file from a floppy hooked up to the booger.
(even though this is a graphic interface, i want to display more than just
4 lines of txt at no predetermined size)
wattya think?
-Sparky
At 10:07 PM 9/13/99 EDT, you wrote:
>alright...iv done work with LCD screens and i believe that is what you are
>looking for (not LED right)..you can controle some with pics, stamps, and
>right from the parelle port, but i need more info on the LCD.
>
>steve
>
>
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