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> Zaurus Oscilloscope, using commercial hardware
jfr
post Aug 24 2007, 03:43 PM
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This post is a trawl, to see whether there's any wider interest in an oscilloscope project I've been working on.

The project uses a digital scope manufactured by Syscomp - the DSO-101. It's a two-channel scope, which plugs into a USB port and uses the conputer as its driver and display. You can read lots more about it at Syscomp's web site.

What I've been doing is to port the host software to the Z.

I bought the scope in the first place in connection with a Morse-to-speech project (mentioned before in these forums). I liked the spec and the price, and I particularly liked the fact that the software that runs on the host is open sourced. The software is written in Tcl/Tk, and I've been porting the main functionality to C++/Qt.

The scope hardware is physically bigger than a Zaurus, but not by all that much, so I thought it would be neat to use the Z as a host and thus end up with a pocket-sized oscilloscope system.

I've now got the port working pretty much to my satisfaction (YMMV). The port doesn't have all the advanced features of the original software, but I think it does count as a workable system. My Zauri are still using their original Sharp ROMs, and the program should work on C1000/3000/3100/3200.

(Dis)claimer: When I first bought the scope, I was merely another customer for Syscomp. I then offered them a couple of contributions for the host software, and that progressed to the point where I became a beta-tester for them. From that, I discussed the idea of the Z port and they were immensely supportive, including supplying extra hardware for the purpose. From that, you'll correctly gather that I think these people are Good Guys. But I have no commercial relationship with them - this is an open source project, pure and simple.

Maybe this is just my private toy, but if anyone else would be interested, I'd be happy to share it.

Cheers

John
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speculatrix
post Aug 28 2007, 02:17 PM
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am definitely interested... in fact I talked to a UK distributor of one USB scope (I think they were called Elan) and at the time they didn't/wouldn't do a linux driver; it was also about US$300 or so, and I decided against it.

I did wonder whether the microphone input could be pressed into service as an ADC using suitable signal conditioning.
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jfr
post Aug 28 2007, 03:46 PM
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QUOTE(speculatrix @ Aug 28 2007, 11:17 PM)
am definitely interested... in fact I talked to a UK distributor of one USB scope (I think they were called Elan) and at the time they didn't/wouldn't do a linux driver; it was also about US$300 or so, and I decided against it.

I did wonder whether the microphone input could be pressed into service as an ADC using suitable signal conditioning.
*

I think the microphone input could certainly be used for a scope program, but I wanted something with a bandwidth from DC, and a "proper" high-impedance input that would take standard scope probes and not load the circuit under test. The DSO-101 has a 2MHz bandwidth and a sampling rate up to 20MHz, which was plenty for my needs and which comfortably exceeds anything the mic input could deliver. But if anyone were to put together a scope program using the mic input, I imagine there would be interest in that too.

Well, there's clearly interest in this thing. I'm now working further on the software, with the idea in mind of a demo mode - try the software without having to buy the hardware first. I'll also try to put together a few screen shots and explanations, to give an idea of what the GUI is like.
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jfr   Zaurus Oscilloscope   Aug 24 2007, 03:43 PM
gsgmx   Sounds great, i might get one of these scopes too...   Aug 25 2007, 03:42 AM
jfr   QUOTE(gsgmx @ Aug 25 2007, 12:42 PM)The DSO i...   Aug 25 2007, 04:55 AM
Drake01   QUOTE(jfr @ Aug 25 2007, 07:55 AM)It does nee...   Aug 25 2007, 07:24 AM
jfr   QUOTE(Drake01 @ Aug 25 2007, 04:24 PM)Sounds ...   Aug 25 2007, 03:55 PM
Drake01   QUOTE(jfr @ Aug 25 2007, 06:55 PM)Thanks, Dra...   Aug 26 2007, 07:45 AM
pelrun   Wow, I think I need to start putting away some pen...   Aug 25 2007, 08:57 AM
aeazocar   jfr, Congratulations, this is a great project...   Aug 26 2007, 06:28 AM
boardboyd   Just to add, I'm in support of this project an...   Aug 28 2007, 08:43 AM
speculatrix   am definitely interested... in fact I talked to a ...   Aug 28 2007, 02:17 PM
jfr   QUOTE(speculatrix @ Aug 28 2007, 11:17 PM)am ...   Aug 28 2007, 03:46 PM
speculatrix   definitely very interested, whether the source was...   Aug 30 2007, 01:55 PM
Da_Blitz   mm, cant believe i missed this post, i am thinking...   Aug 31 2007, 01:53 AM
louigi600   I've been using on my x86 pc (with linux natur...   Aug 31 2007, 04:31 AM
Da_Blitz   xoscope is nice but it has its limits, mainly bien...   Aug 31 2007, 05:13 AM
speculatrix   QUOTE(Da_Blitz @ Aug 31 2007, 02:13 PM)xoscop...   Aug 31 2007, 08:20 AM
louigi600   A free audible band oscilloscope/spectrom analizer...   Aug 31 2007, 06:18 AM
louigi600   Hum ... I think it's more commonly known as ...   Aug 31 2007, 10:01 AM
speculatrix   hmm, it's been a long time since I did analogu...   Aug 31 2007, 12:01 PM
jfr   Ok, here's some further info on the project. O...   Sep 1 2007, 06:44 AM
Da_Blitz   not to mention the low freq cutoff is normally fai...   Aug 31 2007, 10:26 AM
speculatrix   cool! excellent work! I assume you're ...   Sep 1 2007, 01:14 PM
jfr   QUOTE(speculatrix @ Sep 1 2007, 10:14 PM)cool...   Sep 1 2007, 02:36 PM
speculatrix   QUOTE(jfr @ Sep 1 2007, 11:36 PM)I also had t...   Sep 1 2007, 02:56 PM
jfr   QUOTE(speculatrix @ Sep 1 2007, 11:56 PM)are ...   Sep 1 2007, 03:24 PM
speculatrix   I am wondering if anyone's done anything new f...   May 13 2008, 01:04 PM
Ragnorok   - Neat! I've been looking for a DSO to do...   Jun 29 2008, 04:10 PM
jfr   QUOTE(Ragnorok @ Jun 30 2008, 01:10 AM) 1...   Jul 20 2008, 02:39 PM
pelrun   Well the syscomp features adjustable pre and post ...   Jun 29 2008, 05:00 PM
Ragnorok   - Sorry for my slow reply. I have seventy differe...   Aug 28 2008, 10:36 AM


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