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'[EE]: does anyone sell a cheap logic analyzer ?'
2006\01\29@142725 by Gus Salavatore Calabrese

face picon face
Something PIC based, that would scan data and address lines
and report the results to a serial LCD ?
Something that would cost under $50 ?

Regards

AGSC

Augustus Gustavius Salvatore Calabrese 720.222.1309    AGSC
http://www.omegadogs.com   Denver, CO

2006\01\29@153653 by Robert Rolf

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At what speed, with what memory depth?

There are a few free PC based programs that use the parallel port,
but I doubt you'll find ANYTHING hardware based for $50.00.

Would YOU build and sell such a device for that cheap?

R

Gus Salavatore Calabrese wrote:

{Quote hidden}

2006\01\30@125712 by Gus Salavatore Calabrese

face picon face
Yes I would build a device for that cheap.  I failed to make
my specifications detailed enough as you point out, Robert.
I want a speed of 10 Hz and a depth of one.  Thus I can single
step my process or halt it and see what is going on.  I was not
looking for a trigger or anything like that.
AGSC




At what speed, with what memory depth?

There are a few free PC based programs that use the parallel port,
but I doubt you'll find ANYTHING hardware based for $50.00.

Would YOU build and sell such a device for that cheap?

R
From: Robert Rolf <spam_OUTRobert.RolfTakeThisOuTspamUAlberta.ca>

2006\01\30@133845 by David VanHorn

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Way back when, I made a simple "logic analyzer" from an HC866 8 bit
magnitude comparator, a dipswitch, and some test clips.  The output of the
866 goes true when/if the inputs on both sides match.. This I fed to a 555
and sonalert, and I had an output to trigger my scope when match happened.

Pretty rude and crude, but it worked well and I solved a lot of problems
with it.

2006\01\30@164657 by alan smith

picon face
isn't that called a logic probe?

Gus Salavatore Calabrese <.....gscKILLspamspam@spam@omegadogs.com> wrote:  Yes I would build a device for that cheap. I failed to make
my specifications detailed enough as you point out, Robert.
I want a speed of 10 Hz and a depth of one. Thus I can single
step my process or halt it and see what is going on. I was not
looking for a trigger or anything like that.
AGSC




At what speed, with what memory depth?

There are a few free PC based programs that use the parallel port,
but I doubt you'll find ANYTHING hardware based for $50.00.

Would YOU build and sell such a device for that cheap?

R
From: Robert Rolf

2006\01\31@100050 by Sergey Dryga

face picon face
Gus Salavatore Calabrese <gsc <at> omegadogs.com> writes:

>
> Something PIC based, that would scan data and address lines
> and report the results to a serial LCD ?
> Something that would cost under $50 ?
>
Take a look at beaglerobotics.com/catalog/product_info.php?
cPath=21&products_id=33

monitor 8 data lines and output to 8 LEDs.  Low speed, but low cost too.

Sergey Dryga



'[EE]: does anyone sell a cheap logic analyzer ?'
2006\02\01@161722 by Dwayne Reid
flavicon
face
At 12:27 PM 1/29/2006, Gus Salavatore Calabrese wrote:
>Something PIC based, that would scan data and address lines
>and report the results to a serial LCD ?
>Something that would cost under $50 ?

Somewhat more than you wanted but might be worth checking out:
http://www.parallax.com/search_results.asp?txtsearchParamTxt=analyzer&txtsearchParamCat=ALL&txtsearchParamType=ALL&iLevel=1&txtsearchParamMan=ALL&txtsearchParamVen=ALL&txtFromSearch=fromSearch

From the website:

The BASIC Stamp Logic Analyzer (BSLA) is a collaborative design
between Parallax and CWAV, the developer of the popular USBee Pod
logic analyzer series (http://www.usbee.com). The BSLA fits between all
24-pin BASIC Stamp and Javelin Stamp modules and their programming socket.

The BSLA hardware connects directly to your PC's USB 2.0 port.
Download the documentation below to see pictures of the installed
hardware. The software runs on your PC and displays the digital value
of all BASIC Stamp I/O and programming pins.

BSLA Hardware Features:

USB 2.0 High-Speed interface

Power is from the USB port

2 Ms/s sample rates, fast enough for all Parallax 24-pin modules

20 channels (16 for I/Os and 4 for Vdd, Res, Sout, Sin)

Thresholds set at 1.4V and 0.8V, supporting TTL and CMOS

Small size (3.25 L x 1.95 W x 1.67 T cm / 1.28" L x 0.77" W x 0.66" T)

The BSLA software has the following features and may be downloaded
below for evaluation:

Compatible with Win2K, WinXP operating systems

Multiple triggering options on all channels

I2C, asynchronous serial, SPI bus decoder

Minimum sample depth of 1 million samples up to available PC RAM

Sample clock generated internally

Zoom in, zoom out and zoom all

Save, Open and Print captured data and settings

Movable cursors for easy measurements

Note: Your computer must have High Speed USB (USB 2.0) to use the
BASIC Stamp Logic Analyzer. You can find out if your PC has USB 2.0
by looking in the Hardware Device Manager. Navigate Start Menu,
Windows Control Panel, System, Hardware Tab, Device Manager,
Universal Serial Bus section.  If there is an entry for an "Enhanced
Host Controller" then you have USB 2.0. If you don't have USB 2.0,
you can purchase a USB 2.0 card for less than $20 at many online
stores such as eBay.

Although this is intended to monitor all the lines from a 24 pin DIP
stamp, I don't see anything saying that you can't plug your own
signals into those sockets.

dwayne

--
Dwayne Reid   <dwaynerspamKILLspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

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