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PICList Thread
'PC printer port'
1999\03\28@045734 by ken

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Has anybody had any experience of powering a PIC from the PC printer
port and if so how did you go about it, any problems to lookout for.

Ken.

+-----------------------------+--------------------------------------------+
|      Ken Hewitt  G8PWC      |        Email spam_OUTkenTakeThisOuTspamwelwyn.demon.co.uk        |
|      /\/\/\/\/\/\/\/\/      |  Homepage   http://www.welwyn.demon.co.uk  |
+-----------------------------+--------------------------------------------+

1999\03\28@055450 by Bob Drzyzgula

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Ken,

There have been a number of discussions on this on the
piclist. A good way to review them is to go to the
piclist archive at http://www.iversoft.com/piclist/.
About a quarter the way down that page, there is a
search box; I found that entering "parallel port power"
and clicking on the search button reuslted in a pile
of references.

--Bob

On Sun, Mar 28, 1999 at 10:47:42AM +0100, ken wrote:
> Has anybody had any experience of powering a PIC from the PC printer
> port and if so how did you go about it, any problems to lookout for.
>
> Ken.
>
> +-----------------------------+--------------------------------------------+
> |      Ken Hewitt  G8PWC      |        Email .....kenKILLspamspam@spam@welwyn.demon.co.uk        |
> |      /\/\/\/\/\/\/\/\/      |  Homepage   http://www.welwyn.demon.co.uk  |
> +-----------------------------+--------------------------------------------+

--
============================================================
Bob Drzyzgula                             It's not a problem
bobspamKILLspamdrzyzgula.org                until something bad happens
============================================================

1999\03\28@105807 by Myke Predko

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Hi Ken,

I've done it a number of times and you have to be very careful with how you
go about it.  In my current PC, I have two parallel ports, LPT1 is built
into the motherboard and is part of the "Super IO" chip and can only
sink/source 1 mA from each pin.  The second is an old ISA card I have had
for years with LS244s/LS374s drivers on them that can source 25+ mA per pin.

I recently drove a 12C509 from the parallel port and found that I had to use
two of the handshaking pins ("-Slct In" and "-Init") in parallel to be able
to power the PICMicro.

To wire the power to the PICMicro, I used to, small signal diodes (IN914s)
wired in parallel (Please Excuse the ASCII graphics):

-Init    ----|>|----+--- To PIC12C509
                   |
-Slct In ----|>|----+

The 12C5xx parts are idea for this because they require 2 mA when driven
with the internal oscillator.

Good luck,

myke

{Original Message removed}

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