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'[EE]: Bench data acquisition'
2002\04\16@024715 by so-8859-1?Q?Niklas_L=F6vgren?=

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Hi
As I feel my economy wouldn't support obtaining an oscilloscope I've had
thoughts of designing
and building some kind of simple data acquisition gadget. Now I don't mean
some super scope with
+100MHz sampling more something simple with specs like:
- Moderate sampling frequency, 10 - 40MHz
- Triggering functionality like if >trig level then trig
- Ability to transfer the data to computer for visual output

A have a draft idea of the system architecture:
It will consist of two parts:
1. The actual acquistition hardware, with two alternatives
       a. A ADC together with one or more FIFO (which I believe is the
commercial solution)
       b. A ADC together with an SRAM and memory controller with adress
count etc (would be sufficient
          at lower fs)
2. A host controller, an MCU of choice, to take care of the PC interface and
overall control.

My choice of hardware would be (due to availability): MCU AT90S8515 (if
sufficient), random logic
Altera EPM7064, ADC TDA8703?

So now my questions are:
1. Is there anyone who have done anything like this before?
2. Do you have any suggestions about improvements, additional features etc?

/Niklas

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2002\04\16@025536 by David Harris

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Hi Niklas-
I thought this is an interesting project and actually looked into obtaining
parts, not too bad.  I'd even be interested in sharing the cost of getting a
board made.
http://www.chocbar.demon.co.uk/
DSO Specification
                        The DSO has the following specification, this is likely
to change significantly as the project is further developed.

            Channel Spec
                           1.6MHz to 50MHz sample rate
                           8 Bit resolution
                           3MBit sample depth
                           Analogue and digital capability
          Operating Modes
                           Dual channel (2 analogue channels)
                           Single channel (double speed and depth, i.e. 100MHz
& 6MBit)
                           Logic analyser (16 digital channels)
                           Mixed mode (8 digital & 1 analogue channel)
             Triggering
                           Variable pre-trigger
                           Variable edge trigging threshold
                           External trigger input
                           Logic analyser triggering
             Software
                           Fully GUI driven
                           Full control of hardware from software
                           Zoom & Pan functions
                           Trigger level & point indicator
                           CSV export function
               Misc
                           Flexible design allows for expansion and bug fixes
without hardware modification.
                           ISP (In System Programmable)
David

Niklas Lvvgren wrote:

{Quote hidden}

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David Harris
 OmniPort Home Page:  http://www3.telus.net/OmniPort1/
   Discussion egroup: http://groups.yahoo.com/group/OmniPort
   Swiki:  http://omniport.swiki.net/1

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2002\04\16@035739 by Craig Anderson

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Niklas Lövgren wrote:
> As I feel my economy wouldn't support obtaining an oscilloscope I've had
> thoughts of designing
> and building some kind of simple data acquisition gadget

There's http://www.bitscope.com a dual trace 100 MHz (max 25 or 40 MHz sampling)
8 bit ADC scope and 8 channel logic analyser.  It's (mostly) open design
so you can build it yourself, buy the board only, a parts kit, etc.  Lots
of open source software to drive it.

Everyone always points out that old, good oscilloscopes are cheap
on ebay.

-Craig

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2002\04\16@075741 by Al Williams

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Now I don't mean some
> super scope with
> +100MHz sampling more something simple with specs like:


I have a very simple scope project built around our APP-II (really a
PIC16F873) at: http://www.al-williams.com/awce/app2.htm (this was a
previous "Stamp Project of the Month"). Not very fast, but workable.
Even simpler than what you propose.

I've also done a "logic scope" in Altera, but I haven't released it yet
-- will probably run somewhere eventually though.

Regards,

Al Williams
AWC
* Control 8 servos at once
http://www.al-williams.com/awce/pak8.htm

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