Another Arduino Oscilloscope

On a bit of a tangent from my Home Easy hacking, I’ve been experimenting with an alternative to the poorman’s oscilloscope. The arduino + processing hack is brilliantly simple but it wasn’t much use with the signals I was trying to look at.

Zelscope looks quite interesting but it’s a trial download, plus I wanted to keep the arduino end of the poorman’s oscilloscope hack the same if possible. The Universal Real-Time Software Oscilloscope GUI DLL Library didn’t initially look as interesting since I was hoping not to have to write any code. On closer inspection, it does have a test .exe which will import data, which only needed a tiny change to the arduino sketch from the original hack:

Serial.print( val );
Serial.print(“\t0.0000000000\t0.0000000000\n\r”);

So just get the data from the serial port, into a file and import it… either I’m missing something or getting data from a serial port on Windows is a bit of a pain. I ended up using PowerShell to do the job, starting with some instructions for reading from a serial port on the PowerShell blog. Unfortunately that doesn’t seem to work, but getting rid of the add_DataReceived line and using ReadLine() did the job:

[string]$str = $port.ReadLine()
Add-Content “C:\Temp\Data.txt” $str

I do wonder if I could use the oscilloscope GUI DLL library directly from PowerShell. I get the impression that might be possible- I expect Dale will know the answer! For now, here are the results importing a file:

arduinoscope

Not bad, although I’ve yet to see if it makes finding the signal I want any easier. Next week I’ll be at my mum’s house trying to find an actual oscilloscope which I used to have!

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2 thoughts on “Another Arduino Oscilloscope

  1. Yeah, it should be do-able to access the DLL in PowerShell

    Something like:
    [Reflection.Assembly]::LoadFile("c:\path\to\your.dll")

    Then use it like:
    [YourDllsNamespace.ClassName]::AStaticMethod(arg1, arg2, arg3)

    or:
    $anInstance = new-object YourDllsNamespace.ClassName
    $anInstance.NonStaticMethod(arg1, arg2)

    I think… it’s been a while since I’ve played with this stuff.

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