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open source GPIB adapter

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Venturi962:
On Linux, try this: https://techoverflow.net/2019/08/09/how-to-fix-pyvisa-found-a-device-whose-serial-number-cannot-be-read-the-partial-visa-resource-name-is-usb0-0instr/ - I recall some issues like this on a Raspberry Pi,  I could run Python scripts as Root to get around the issue temporarily.

On Windows, I think you can also use PyVisa + PyVisa-Py if you don't want to use other VISA solutions (personally I use the Keysight one).

Linux-gpib isn't needed as this is considered a USB Resource and not a GPIB one.

PioB:
Thank you very much Venturi962, I owe you one!
And I will refer back to the forum here next time I upgrade fedora... Everything works and I got an answer from my power supply!
Both modules I built work and I can talk to the power supply!

 :-+

python
Python 3.10.2 (main, Jan 17 2022, 00:00:00) [GCC 11.2.1 20211203 (Red Hat 11.2.1-7)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyvisa
>>> rm = pyvisa.ResourceManager()
>>> print(rm.list_resources())

('USB0::1003::8293::HEWLETT-PACKARD_E3633A_0_1.4-5.0-1.0::0::INSTR',)
>>> my_instrument = rm.open_resource('USB0::1003::8293::HEWLETT-PACKARD_E3633A_0_1.4-5.0-1.0::0::INSTR')
>>> print(my_instrument.query('*IDN?'))
HEWLETT-PACKARD,E3633A,0,1.4-5.0-1.0




Thanks a lot!

dazz1:
Hi
I saw early discussion on this thread about availability of MCUs.
element14 shows both:
ATMEGA32U4-AU, part number 1748525  and,
ATMEGA32U4-MU, part number 2425127

are in stock.

Which is the easiest package to hand solder? 

dazz1:

--- Quote from: Venturi962 on February 06, 2022, 02:14:12 pm ---Thanks for the head start, reworked VBus, caps and some signal lines.

Edit: Made some more updates. 

Hardware Notes:

* Schematic has 100nF Caps for the Crystal, original has 22pF

* Switched to more common Crystal size
* Prefer through-hole pin headers as opposed to SMD
* usb_gpib_2022_02_06C.zip (1880.68 kB - downloaded 47 times.)

--- End quote ---

Hi
Is this the latest design version?

dazz1:
Hi
I have ordered Xyphro PCB design, then I found this thread.  Hmmmm.  I have changed course and now intend to build the Ventura variant. 

I like the Ventura design a lot and I am looking at making some minor tweaks.
I'd prefer the old USB B connector because it is a lot more robust than a micro.  1st option was to allow either to be used on one PCB design, but my initial assessment is that I don't think it is viable without increasing the PCB size.   Given that a small increase in the PCB size would have zero cost consequences, that option is still worth considering. 

The newish type C USB connector looks to be more robust than the micro without the bulk of the B version.   Maybe this version:  https://nz.element14.com/molex/217175-0001/usb-conn-2-0-type-c-rcpt-6pos/dp/3702928?ost=2171750001.   A C-type connector might be the best choice for a new design.

Also considering using a dual colour LED driven half by pin 39.  Something like this https://www.farnell.com/datasheets/1676973.pdf.  This would remain compatible with xyphro code but allow for some future enhancements to LED indications. 

I haven't used KiCAD before so modifying an existing design would be a good learning exercise.

 

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