PC Oscilloscope

[fletchEU]

Hi,

Does anybody know about some PC oscilloscope that is free (schematic, PC program) that is able to measure 20 MHz signals, has at least 2 channels and if possible open API? Thanx in advance.


FIRST TRY SEARCHING BEFORE ASKING AND WHEN YOU FIND THIS IMPOSSIBLE REQUEST PLEASE SHARE IT

[zokij]

Hi 
try to read  topic on this forum...
  there are plentiful of project for PC Oscilloscope ...

but you will learn to use forum as well ... 
in meantime here is one project for you ... 



Here are the basic specs :

    * 20MS/s
    * 5MHz analog bandwidth (*see below)
    * Dual channels
    * Optional external trigger input.
    * PC-Based, connects to standard parallel port.
    * Easy to build on one single sided pcb.
    * Vertical position adjustments.
    * Fully software controlled timebase and attenuation rages.
    * 100ns/div to 50ms/div timebase in 1-2-5 sequence.
    * 100mV/div to 5V/div vertical ranges in 1-2-5 sequence.


at

http://www.alternatezone.com/electronics/dsoamk3.htm



or for me easy (better) one:

PIC12F675 Oscilloscope



This is a simple PC voltage oscilloscope using only a PIC12F675, a 20MHz oscillator, and a RS232 level shifter. The PIC takes a sample on GP2, immediately sends it to the PC at 115,200 baud using an software asynchronous serial routine, and repeats. It sends a 8-bit value that is read by the Visual Basic software and displayed on the screen (see examples below). The Visual Basic software deduces the time period between submissions and adjusts the display accordingly.



The microcontroller code can be downloaded here:

jal:
http://semifluid.com/PIC12F675_Oscilloscope/uSendAnalogHS.jal

hex:
http://semifluid.com/PIC12F675_Oscilloscope/uSendAnalogHS.hex

Visual Basic code example:
http://semifluid.com/PIC12F675_Oscilloscope/675OscilloscopeDR1r1.zip

THANK'S zokij  NICE TRY BUT YOU HAVE TO BUY PARTS SO IT ISN'T FREE 

Posted on: May 12, 2008, 06:30:05 18:30 - Automerged
  Ok, my mistake 

  Then you can try :

  The PC Scope project was published on Everyday Practical Electronics on August 2007 and September 2007



V2 PC scope
PC controlled PIC sampling
Frequency range DC to >40kHz
Dual channel analogue
Single channel spectrum analysis
Single channel 8-bit digital
On-screen control of all functions


I hope now is ok bbarney 

wise guy

[fletchEU]

Many thanx and sorry, I have found some links meanwhile. I found this super forum yesterday and didn't see the links until now so I started this topic. Sorry for that once again.

[zokij]

  anyway 

I found one more nice project, probably will be  engaging for some other member...

PC Oscilloscope 20MHz with PIC 18F452



    * Layout  : http://www.brodeurelectronique.com/index.php?dlm/12/33 (84.66 KB)
    * Schema : http://www.brodeurelectronique.com/index.php?dlm/12/34 (94.64 KB)
    * PCB bot : http://www.brodeurelectronique.com/index.php?dlm/12/35 (35.5 KB)
    * PCB top : http://www.brodeurelectronique.com/index.php?dlm/12/36 (28.24 KB)
    * EAGLE 4.11 : http://www.brodeurelectronique.com/index.php?dlm/12/37 (68.57 KB)
    * partlist : http://www.brodeurelectronique.com/index.php?dlm/12/38 (4.19 KB)
    * Executable Windows : http://www.brodeurelectronique.com/index.php?dlm/12/39 (346.73 KB)
    * Sources Borland C++ : http://www.brodeurelectronique.com/index.php?dlm/12/40 (426.79 KB)
    * Sources ASM for PIC18F452 : http://www.brodeurelectronique.com/index.php?dlm/12/41 (27.1 KB)

and final
form me very nice complete project with documentation, firmware, software, hardware...

is

 

Oscilloscope USB

Draft Final career of Paul Hoffman and Martin Szmulewicz 

at:
http://64.233.179.104/translate_c?u=http%3A%2F%2Fpablohoffman.com%2Fcgi-bin%2Ftwiki%2Fbin%2Fview%2FOscusb%2FWebHome&langpair=es%7Cen&hl=en&ie=UTF8

[warco2551]

Have an oscilloscope that interface with sound card and attenuation circuit

[gedonet]

Hi
I test a simple oscillo with a Maxim Dallas MAX1241 it's in french but very easy to buit:
http://paulfjujo.free.fr/SCOPES/scopes.htm
Gilles

[mdb1983]

Thanx

I want to inform ,if i want to make oscilloscope with sampling frequency 200Mhz how can i make an interface between ADC and the PIC??
I mean the speed of ADC is more than speed of PIC ==> uC will not get the signal

[zokij]

Hi,

Probably you can try to consider about use Sample hold in your design...
Before few year when I make some DAQ with HC11 I use Analog device ADC and then I use Analog Device sample hold....

click on image to see big size

if you wish there are some useful document .... to read
write me which ADC you use and I will try found some project for you...

http://rapidshare.com/files/117630525/014.rar


Here is one sample:

click on image to see big size

more info, description and asm:

http://www.maxim-ic.com/appnotes.cfm/an_pk/2394

warning : separate the analog and digital grounds singu a ferrite bead!