Post by thread:PIC based Digital Storage Oscilloscope

Hello again piclisters, Well, I finally have a prototype PIC based DSO working! Currently, it samples at 10MS/s and is untriggered. I am currently looking for suggestions for improvements that I could add in the second prototype. I will definately allow a variable sample rate (up to 40MS/s probably), add triggering (level and slope), have a standard input impedance (1Meg in parallel with a few pF), and add aditional memory to bring it up to about 64k for the sample buffer. I also hope to make it dual channel. So, I am asking you to let me know of any additional improvements that you would like to see, as well as any suggestions on how to implement them. Some time down the road, I will probably add a logic analyzer to it as well. The problem that was keeping it from working had something to do with a bad cable or bad solder connections on the main board. I never exactly found out because I just rebuilt most of it and it worked. The only remaining problem is some high frequency noise on the ADC, but that may have something to do with the extra long digital lead lengths that I have sitting right next to the sensitive analog section. Thanks for the suggestions Sean

Could you tell me what ADC you are using? I'm planning a DSO using one GameBoy. Regards, Octavio ====================================================== Octavio Nogueira - e-mail: spam_OUTnogueiraTakeThisOuTmandic.com.br http://www.geocities.com/~oct_nogueira "ProPic" Production PIC Programmer Windows under US$20 ====================================================== -----Mensagem original----- De: Sean Breheny <.....shb7KILLspam@spam@CORNELL.EDU> Para: PICLISTKILLspamMITVMA.MIT.EDU <.....PICLISTKILLspam.....MITVMA.MIT.EDU> Data: Segunda-feira, Agosto 03, 1998 01:52 Assunto: PIC based Digital Storage Oscilloscope {Quote hidden}>Hello again piclisters, > >Well, I finally have a prototype PIC based DSO working! Currently, it >samples at 10MS/s and is untriggered. I am currently looking for >suggestions for improvements that I could add in the second prototype. I >will definately allow a variable sample rate (up to 40MS/s probably), add >triggering (level and slope), have a standard input impedance (1Meg in >parallel with a few pF), and add aditional memory to bring it up to about >64k for the sample buffer. I also hope to make it dual channel. > >So, I am asking you to let me know of any additional improvements that >you would like to see, as well as any suggestions on how to implement >them. Some time down the road, I will probably add a logic analyzer to it >as well. > > >The problem that was keeping it from working had something to do with a >bad cable or bad solder connections on the main board. I never exactly >found out because I just rebuilt most of it and it worked. > >The only remaining problem is some high frequency noise on the ADC, but >that may have something to do with the extra long digital lead lengths >that I have sitting right next to the sensitive analog section. > >Thanks for the suggestions > >Sean >

Hello Octavio, Sean, I read my mail and found the Digital Storage Oscilloscoop related mail. As I and perhaps many others are wondering are the following questions, Using a gameboy ? Where did you get the schematics of a gameboy ? I refer to the following message : > Could you tell me what ADC you are using? > I'm planning a DSO using one GameBoy. > > Regards, > > Octavio Another question is, what kind of ADC's did you use (are the expensive) and how do you display your stored information (do you use a none storage oscilloscoop, do you use a normal T.V. or monitor, do you use a pixel display). Is your project a secret one or do you like to share it with other electronic hobbyists. I guess that some of us like to see the schematics (just interested). I refer to the following message : {Quote hidden}> > >Hello again piclisters, > > > >Well, I finally have a prototype PIC based DSO working! Currently, it > >samples at 10MS/s and is untriggered. I am currently looking for > >suggestions for improvements that I could add in the second prototype. I > >will definately allow a variable sample rate (up to 40MS/s probably), add > >triggering (level and slope), have a standard input impedance (1Meg in > >parallel with a few pF), and add aditional memory to bring it up to about > >64k for the sample buffer. I also hope to make it dual channel. > > > >So, I am asking you to let me know of any additional improvements that > >you would like to see, as well as any suggestions on how to implement > >them. Some time down the road, I will probably add a logic analyzer to it > >as well. > > > > > >The problem that was keeping it from working had something to do with a > >bad cable or bad solder connections on the main board. I never exactly > >found out because I just rebuilt most of it and it worked. > > > >The only remaining problem is some high frequency noise on the ADC, but > >that may have something to do with the extra long digital lead lengths > >that I have sitting right next to the sensitive analog section. > > > >Thanks for the suggestions > > > >Sean > >

> [EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU]On Behalf Of Jan Derogee > Hello Octavio, Sean, > I read my mail and found the Digital Storage Oscilloscoop related mail. > As I and perhaps many others are wondering are the following questions, > Using a gameboy ? Where did you get the schematics of a gameboy ? > I refer to the following message : > > > Could you tell me what ADC you are using? > > I'm planning a DSO using one GameBoy. > > > > Regards, > > > > Octavio This is a brilliant idea. There is a huge amount of information on the net concerning the GB internals, including full blown development systems, ROM emulators etc, and the DOS emulator is useful too. Something approaching a DSO (albeit very simple) might well be possible. Do you plan to map everything into memory via the cartridge? Is this is possible? That way you can still play Tetris inbetween debugging sessions. And when the color Gameboy comes out... Super Mario DSO. Nice ring. Keep us up to date, Stuart.

Hello everyone, I have not been following the DSO topic very closely, but when I read about using a GameBoy something clicked in my mind. I am an electrical engineering student at Iowa State University and about 1 or 2 years ago one of our senior design groups did a project where they were going to make a cheap DSO or some kind of scope using the Game Boy. The concept was that maybe students could have an "affordable" scope for personal use. I do not know if it worked or how well it worked but I can get more information if needed. -- James E. Merritt N0SRB Iowa State University jemspam_OUTiastate.edu Center for Nondestructive Evaluation Electrical Engineering student x-ray tech/modeller/programmer

{Quote hidden}>> [@spam@PICLISTKILLspamMITVMA.MIT.EDU]On Behalf Of Jan Derogee >> Hello Octavio, Sean, >> > Could you tell me what ADC you are using? >> > I'm planning a DSO using one GameBoy. >> > >> > Regards, >> > >> > Octavio > >This is a brilliant idea. There is a huge amount of information on the net >concerning the GB internals, including full blown development systems, ROM >emulators etc, and the DOS emulator is useful too. Something approaching a >DSO (albeit very simple) might well be possible. > >Do you plan to map everything into memory via the cartridge? Is this is >possible? That way you can still play Tetris inbetween debugging sessions. > >And when the color Gameboy comes out... > >Super Mario DSO. Nice ring. > >Keep us up to date, > >Stuart. > Yes, Super Mario DSO would be really cool... But thinking more seriously, yes I'm planning to map everything on the cartridge Regards, Octavio ====================================================== Octavio Nogueira - e-mail: KILLspamnogueiraKILLspammandic.com.br http://www.geocities.com/~oct_nogueira "ProPic" Production PIC Programmer Windows under US$20 ======================================================

The first place to look is: home.hiwaay.net/~jfrohwei/gameboy/home.html Regards Octavio ====================================================== Octavio Nogueira - e-mail: RemoveMEnogueiraTakeThisOuTmandic.com.br http://www.geocities.com/~oct_nogueira "ProPic" Production PIC Programmer Windows under US$20 ====================================================== -----Mensagem original----- De: Dmitry Kiryashov <spamBeGonezewsspamBeGoneAHA.RU> Para: TakeThisOuTPICLISTEraseMEspam_OUTMITVMA.MIT.EDU <RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU> Data: Quarta-feira, Agosto 05, 1998 04:16 Assunto: Re: PIC based Digital Storage Oscilloscope {Quote hidden}>Jan Derogee wrote: > >> Using a gameboy ? Where did you get the schematics of a gameboy ? >> I refer to the following message : > >I'm also interesting to look into gameboy schematics. >I'll be glad to see any information or url related to this topic. > >WBR Dmitry. >

> To satify all of your interests in Gameboy, here is: http://hiwaay.net/~jfrohwei/gameboy/I also developed an DSO based on the old 8031, it's still not finished yet, i've used the ADC0804,but you guess the "speed" of that ADC... A gameboy have complex hardware, more than needed for this application, the 8051 is too slow to acomplish a practical DSO (50KHz max), i think if an 'C74 could do this job better. I wrote the complete BIOS (I/O graphical routines triggering and so on) and it used only 3Kb! A 'C74 can handle 4 channels with no additional hardware, only a opamp, the main problem is memory storage. (that's why i choose the 8031) I saw an handwritten schemactic of a flash ADC with FIFO and some gate, it can do 20MHz real DSO, if you are interested, i can post it here or on more apropriate place. Regards > > Using a gameboy ? Where did you get the schematics of a gameboy ? > > I refer to the following message : > > I'm also interesting to look into gameboy schematics. > I'll be glad to see any information or url related to this topic. > > WBR Dmitry.

part 0 2480 bytes <P>   <A HREF="http://www.komkon.org/fms/GameBoy/">http://www.komkon.o rg/fms/GameBoy/</A> <P>where you can find schematics and software to develop applications on GB <P>bye <PRE>--  ___________________________________________________________________________&nbsp ;          .  .  .  &n bsp;        Michel MERMIN        .  o  o  o  .  &nbs p;     Experiment Division / Instrument Support Group & nbsp;     .  o  0 0 0  o  .       EUROPEAN SYNCHROTRON RADIATION FACILITY    . o  0 O O O 0  o .     Boite Postale 220    . o  0 O     O 0  o .    380 43 GRENOBLE CEDEX    . o  0   ESRF  0  o .    France&n bsp;   . o  0 O     O 0  o .   &nbs p;      . o  0 O O O 0  o .     phone:+33/(0) 4 76 88 21 36       .  o  0 0 0  o  .       fax:  +33/(0)4 76 88 25 42       .  o  o  o  .  &nbs p;     EMail: merminEraseME.....esrf.fr           .  .  .  &n bsp;        <A HREF="http://www.esrf.fr">http ://http://www.esrf.fr</A> ___________________________________________________________________________</PRE >  </HTML> </x-html>

Hi, please talk us if the DSO project ready. Can I use it to upgrade my one-channeled analogue oscilloscope? Imre On Wed, 5 Aug 1998, Dmitry Kiryashov wrote: {Quote hidden}> Jan Derogee wrote: > > > Using a gameboy ? Where did you get the schematics of a gameboy ? > > I refer to the following message : > > I'm also interesting to look into gameboy schematics. > I'll be glad to see any information or url related to this topic. > > WBR Dmitry. > >

Hello all, I've been busy at work and haven't had time to respond to the DSO thread. My DSO project is not yet completed. A good deal of work needs to be done before it is ready for others to build (it is not triggered yet, has noise problems, etc.). I will be sure to let you all know when it is ready. In the mean time, I will put a schematic of the current prototype on my web page when I get a chance. I like the gameboy idea, but I don't have one, and besides, for right now, my project is a PC based one (the waveform is displayed on a PC, and all waveform math etc. will be done by PC). eventually, it may go to another platform, possibly the gameboy, and certainly I would be happy if anyone ported it to that platform. It sounds really goofey, but it might work <G>. well, I've got to get back to work. A block diagram, a picture of part of the prototype, and some info (and soon a schematic) are at http://www.people.cornell.edu/pages/shb7/posc.html But again, it is not ready to be built by others yet, but if anyone can get ideas from it, they are more than welcome. Sean On Thu, 6 Aug 1998, Dr. Imre Bartfai wrote: {Quote hidden}> Hi, > please talk us if the DSO project ready. Can I use it to upgrade my > one-channeled analogue oscilloscope? > > Imre > > On Wed, 5 Aug 1998, Dmitry Kiryashov wrote: > > > Jan Derogee wrote: > > > > > Using a gameboy ? Where did you get the schematics of a gameboy ? > > > I refer to the following message : > > > > I'm also interesting to look into gameboy schematics. > > I'll be glad to see any information or url related to this topic. > > > > WBR Dmitry. > > > > >

Well I just made a trip down to the local Toys R Us, and I can pick up a Gameboy and a printer for $120CAN. This would make a hell of a cheap tool! .... and who cares how accurate it is. The HP Dart, which is similar to the proposed project is $1000 US!!!! ... and that doesn't include a printer! (...and you can't play Fudgeman on it either) I think you'all are on to something. I'll mention it to one of my guys who built a PC based one in college when he's free. Is there a cross compiler for the Gameboy? Is it motorola or pic based? Does it have some custom graphics chips, or is it a single proc? Anybody written drivers? Craig {Original Message removed}