Replacing the Oscillloscope with a singel chip
Replacing the Oscillloscope with a singel chip
(OP)
I'm designing a test system for our product that uses an oscilloscope to capture a pulse. I would like to replace the function of the oscilloscope with a micro-controller or DSP chip. The pulse occurs every half second to second and is a minimum of .5ms-1.5ms wide and has 3-5V amplitude. We will have 3 pulses per device. If you could give me direction in which MC to choose it would be much appreciated.
Also, I'm an intern at the company so if there is a simple solution I'm probably over looking it.
Also, I'm an intern at the company so if there is a simple solution I'm probably over looking it.





RE: Replacing the Oscillloscope with a singel chip
For a hint, look at the bookshelves around you.
Mike Halloran
Pembroke Pines, FL, USA
RE: Replacing the Oscillloscope with a singel chip
I like TI DSP evaluation kits. Many TI DSPs have analog inputs built in.
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
RE: Replacing the Oscillloscope with a singel chip
TTFN
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RE: Replacing the Oscillloscope with a singel chip
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Replacing the Oscillloscope with a singel chip
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Replacing the Oscillloscope with a singel chip
The fastest is: http://ww
Your timing doesn't appear to be rigorous. If you only need a hand full of units there's no way to justify the cost and hassle of laying out a board, purchasing parts, purchasing a compiler, and getting the tool chain setup as compared to buying a few of these, hooking any terminal program to it and be writing code for the hardware you'd have in your hand a day or two later.
These are all interpreted so they contain the operating system on board.
You need to refine your timing needs a little better and what the results of monitoring these pulses are.
None of us could solve for the rather vague spec you've given.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Replacing the Oscillloscope with a singel chip
What the microcontroller needs to do is be able to trigger on the falling edge, store and pass on the event, and then close when the pulse is completed. The triggering of the event is what I don't know how to program into a MCU.
What would ideally be done with the signal is it would be compared and given a pass/fail/reset tag, which would later be reviewed by a engineer, as long as the event can be identified by the MC and passed onto a PC the processing can occur there.
The current system uses Agilent VEE 8.5 to interface with an i2c microcontroller which communicates with i2c chips (muxes and ADCs).
I will look though the basic stamp and the PIC devices.
RE: Replacing the Oscillloscope with a singel chip
TTFN
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RE: Replacing the Oscillloscope with a singel chip
The former is done using the remote control commands through a GPIB interface. Where do I begin to find the latter?
The idea is to save $10,000/system by having a chip doing just what is needed, capturing a pulse and passing it to a PC.
RE: Replacing the Oscillloscope with a singel chip
Then you can work backwards from there to derive a minimal capture system.
I don't intend to minimize the difficulty of those two separate tasks. Much reading and learning awaits you. Enjoy.
Mike Halloran
Pembroke Pines, FL, USA
RE: Replacing the Oscillloscope with a singel chip
I think that the other responders have already been quite generous with their responses to a student posting that would otherwise have been deleted by now.
TTFN
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RE: Replacing the Oscillloscope with a singel chip
RE: Replacing the Oscillloscope with a singel chip
TTFN
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RE: Replacing the Oscillloscope with a singel chip
You need to draw little sketches of the various timings and perhaps shapes of the waveforms under test. Also draw or describe clearly, (to yourself), the limits of acceptable results.
Then understand the numbers that will come from analyzing the waveforms up to their allowed limits.
Next, you need to understand the signaling protocol the scope is sending to where ever, because this will define the communications hardware that will have to be provided.
Once you have this information in your head, this preparation, you can look effectively at the various solutions you can apply to see which falls out as the best solution. This will be based on time-to-implement, cost, and any potential hurtles with a particular solution. If one exists some immediate investigation is needed to prevent a project failure when you reach that point in the project.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Replacing the Oscillloscope with a singel chip
1. Shall the new function do exactly what the old one did? I.e. show a picture of the pulses that someone can examine or shall it analyze the pulses all by itself? In the former case, there are lots of very low cost solutions like USB scopes that can replace your unnecessarily costly scope.
2. Will the device do the same thing year after year or is there a need to change limits from time to time?
3. Is this for a few units, for ten units, hundreds, thousands? If you need hundreds or thousands, you can throw in some development money and get exactly what you need. Else, development cost may become a major problem.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...