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Topic: arduino oscilloscope, a nice one :-) (Read 24039 times) previous topic - next topic

xchip

I wrote a nice front end that works with arduino and also Parallax USB scopes..

more info:

http://codinglab.blogspot.com/2010/09/arduino-oscilloscope-and-parallax.html


cr0sh

This is pretty cool - I might have to try it out. I currently have a Tek 2213 analog scope, but I also have a couple of the Parallax scopes, and the only thing holding me back from using them was the fact of no software for Linux, other than some Python (or was it Perl?) code I found.

I thought about writing my own driver/software using the code I did find as a base, but I have yet to even think about getting 'round to it...

This sounds like it might be interesting to play with! Thanks for posting it!

:)
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

Senso

What is the biggest frequency that you can get with an arduino?

Jonathan Oxer

Nice. That software + firmware would drop right on to the hardware described in this project: http://www.practicalarduino.com/projects/scope-logic-analyzer

I'll add a link to your project from that page in a moment.
--
Jon

Senso

But the atmega 328 datasheet clearly states that the adc clock must be between 50Khz and 200KHz, how can this code put and the adc at 1Mhz and still get good values?

Jonathan Oxer

Quote
how can this code put and the adc at 1Mhz and still get good values?


It's a trade-off. It's all explained in detail starting around page 194 of "Practical Arduino", but the basic summary is that the MCU's ADC is rated for optimal precision with a clock between 50 and 200KHz, but is designed to handle up to a 1MHz clock with minimal degradation. The ADC uses a successive approximation technique to read each bit of resolution sequentially, and changing the pre-scaler to force the ADC clock right up to 1MHz makes it complete each sample *much* faster (16 microseconds per read instead of 111 microseconds) at the cost of a little accuracy.

All the details (and explanation of how to manage the ADC pre-scaler flags) are in Practical Arduino.
--
Jon
Practical Arduino: www.practicalarduino.com

xchip

#6
Sep 30, 2010, 12:51 pm Last Edit: Sep 30, 2010, 01:42 pm by xchip Reason: 1
And going back to the original topic....

Has anyone tried it yet? was it easy to use?  I'd like to hear your feedback...

Thanks!

xchip

#7
Sep 30, 2010, 06:47 pm Last Edit: Sep 30, 2010, 06:52 pm by xchip Reason: 1
Some traffic stats about my post:  (yeah kind of off topic)

From the 300 people that read this thread only 100 went to my blog entry, and from there only 45 went to the project page..

I hope this stats are helpful to you, one would expect that 100% of the people that read this post bother to click twice in order to read the full details...

oscarcar

#8
Sep 30, 2010, 07:11 pm Last Edit: Sep 30, 2010, 07:11 pm by oscarcar Reason: 1
Looks nice.

I have something similar, but rudimentary, working in Processing. I would have been tempted to try it, if it was in java as I have other code in java that I'd like to take advantage of.

mk3

wow, good timing.  I'm learning Arduino and electronics at the same time.. the first thing I wanted is some kind of logic analyzer and scope.

I have Jonathan's excellent book and have been working to tweak the Processing to my liking....this will speed my progress.

thanks!!!

majolsurf

Wow really nice!  A good use for my old arduino!  :)

adma84


CBX

can't open the .pde file here...

got this error:

Code: [Select]
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0
     at processing.app.Sketch.setCurrentCode(Unknown Source)
     at processing.app.Sketch.load(Unknown Source)
     at processing.app.Sketch.<init>(Unknown Source)
     at processing.app.Editor.handleOpenInternal(Unknown Source)
     at processing.app.Editor.<init>(Unknown Source)
     at processing.app.Base.handleOpen(Unknown Source)
     at processing.app.Base.handleOpen(Unknown Source)
     at processing.app.Base.handleOpenPrompt(Unknown Source)
     at processing.app.Base$3.actionPerformed(Unknown Source)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
     at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
     at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1225)
     at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1266)
     at java.awt.Component.processMouseEvent(Component.java:6263)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
     at java.awt.Component.processEvent(Component.java:6028)
     at java.awt.Container.processEvent(Container.java:2041)
     at java.awt.Component.dispatchEventImpl(Component.java:4630)
     at java.awt.Container.dispatchEventImpl(Container.java:2099)
     at java.awt.Component.dispatchEvent(Component.java:4460)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
     at java.awt.Container.dispatchEventImpl(Container.java:2085)
     at java.awt.Component.dispatchEvent(Component.java:4460)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

xchip

the PDE is not Processing code, is arduino code.

Let me know how it goes...

CBX

i know that pde is arduino code, the error is from the arduino IDE

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