Red Pitaya

This is where we talk about testing, measuring and repairing things. Sometimes we have to repair the equipment we use to test, measure and repair other things. It's an endless cycle of fixing the broken things we need to fix other broken things.
lsburden
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Location: Wimberley, TX

Red Pitaya

Post by lsburden » Wed Feb 20, 2019 3:00 pm

Anybody heard of the Red Pitaya?

https://www.redpitaya.com/

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mediatechnology
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Re: Red Pitaya

Post by mediatechnology » Wed Feb 20, 2019 5:39 pm

Thank you for posting that!

I hadn't heard of it and need to do a deep-dive. Looks really cool.
https://ka-electronics.com

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billshurv
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Re: Red Pitaya

Post by billshurv » Wed Feb 20, 2019 9:12 pm

Somewhat offputting that all the software runs on a browser. But then again a full Virtins multi-intrument suite is around $500

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mediatechnology
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Re: Red Pitaya

Post by mediatechnology » Thu Feb 21, 2019 7:25 am

WRT it running in a browser I like the platform independence that offers.
Seems to also suggest that the computational load is in the Red Pitaya.
With it serving up web pages is it fair to call it a measurement server?

Couldn't find links to a US distributor.
Not sure I could afford it any way.
https://ka-electronics.com

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billshurv
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Re: Red Pitaya

Post by billshurv » Thu Feb 21, 2019 9:22 am

They appear to ship direct from Slovenia.

lsburden
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Location: Wimberley, TX

Re: Red Pitaya

Post by lsburden » Thu Feb 21, 2019 9:22 am

Available at Mouser in various packages ranging from $240 to $720.
https://www.mouser.com/Embedded-Solutio ... ya&FS=True

Its really interesting. There are some youtube videos. There are already several applications available (scope, spectrum analyzer, frequency response, etc.) but I would like to see an FFT application and possibly a distortion analyzer.

Anyways, really cool. I like the open source model. I have recently started using kicad and learning freecad.

Gold
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Re: Red Pitaya

Post by Gold » Thu Feb 21, 2019 10:42 am

That looks great. I’ll have to look at it in more detail. It’s great that it will run on anything.

billshurv
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Re: Red Pitaya

Post by billshurv » Thu Feb 21, 2019 10:50 am

There are certainly applications for higher sampling rate than a standard sound card will do.

The analog discovery board https://store.digilentinc.com/analog-di ... ro-bundle/ is a lot cheaper and still does a lot. I need an impedance analyser for my vinyl playings and was considering this to automate a boring manual task.

Gold
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Re: Red Pitaya

Post by Gold » Thu Feb 21, 2019 1:20 pm

I'm unsure about how the bit depth relates to noise floor. When looking at an Oscilloscope I look at vertical scale resolution to figure out noise floor. This doesn't give a spec on the Oscilloscope page. How do you figure that out?

The input and output voltage range is quite small. Would you need to build an external box to measure line level audio?

lsburden
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Location: Wimberley, TX

Re: Red Pitaya

Post by lsburden » Thu Feb 21, 2019 2:33 pm

Gold wrote:
Thu Feb 21, 2019 1:20 pm
I'm unsure about how the bit depth relates to noise floor. When looking at an Oscilloscope I look at vertical scale resolution to figure out noise floor. This doesn't give a spec on the Oscilloscope page. How do you figure that out?

The input and output voltage range is quite small. Would you need to build an external box to measure line level audio?
I'm not an expert in digital audio conversion so I can't answer your question with any certainty. I have some experience with ADC's and DAC's but still only have a shaky understanding.
Maybe this can help(?) - https://en.wikipedia.org/wiki/Audio_bit_depth.

Yes. I would expect to have to build an external box.

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