Re: [PLUG] Software/Hardware Oscilloscope Logic Analyzer

If you don't mind spending a bit more money, I can't recommend the Saleae Logic Analyzer enough ($150.00). [1] There is a linux version of the software, which works great for me (Ubuntu 13.10) and it has built in filters for I2C and other protocols, so you can see a decoded version of the data on the bus.

If you look at this blog post, [2] you'll see how the output looks for serial transmission and this one [3] shows an I2C output.

Lastly, if you ever want to upgrade to the better embedded platform, the BeagleBone Black ;) (/me dons shield in preparation of BBB vs. Pi religious battle), I have a collection of I2C resources for the BBB. [4]

[1] https://www.sparkfun.com/products/8938

[2] http://datko.net/2013/11/11/bbb_atmega328p/

[3] http://datko.net/2013/11/04/bbb_tmp102/

[4] http://datko.net/2013/11/03/bbb_i2c/

The bus pirate is also cool :)

Josh

On Sat, Feb 1, 2014 at 10:18 AM, Will <staticphantom@gmail.com> wrote:

Once again. A bus pirate would be ideal. $30 device that has a basic slow oscilloscope, i2c, spi, and UART capture abilities.

-Will C

On Feb 1, 2014 11:07 AM, "Eric H. Johnson" <ejohnson@camalytics.com> wrote:
Casey,

Like Bhaskar said, but you might want to look at using a parallel port if available over a USB. While there are some people working on it, USB has problems with hard real-time. See: http://www.linux-usb-daq.co.uk/tech2_duxfast/ under "Digital I/O". If you need sample rates faster than about 100Khz, then the parallel port is probably not an option either.

Regards,
Eric

How about http://xoscope.sourceforge.net/ and http://www.instructables.com/id/DIY-USB-OSCILLOSCOPE-IN-A-MATCHBOX/?ALLSTEPS

I would be very interested in hearing about what you come up with. I want to do something with an Intel Galileo.

Regards
-- Bhaskar

<snip>

So this leads me to desire (need?) a data signal analyzer. It's been a long
time since I owned a 1950's-vintage Oscilloscope, and I just blew my budget by
spending an extra $50 on a new Pi, but is there a hardware/software solution
out there where I can buy a $50 probe that connects to a USB port?

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___________________________________________________________________________
Philadelphia Linux Users Group -- http://www.phillylinux.org
Announcements - http://lists.phillylinux.org/mailman/listinfo/plug-announce
General Discussion -- http://lists.phillylinux.org/mailman/listinfo/plug