displaying incoming signals

Comments

• Dennis Ferron Posts: 480

  2007-05-25 09:00 edited 2007-05-25 09:00

  We need a bit more info. How do you want to display the graph? On the television, using the Propeller's video capability? On the computer, by uploading data? Or some other method?
  
  If you want to display a digital signal (low or high only) then you can record it directly. But if you have an analog signal, you will need an analog to digital converter chip (ADC). Someone started a thread in this forum a few months ago about how to use an ADC with the prop, and there is a Spin object for that, so it is doable. Just be aware that it will take more work than getting a digital signal.
• rjo_ Posts: 1,825

  2007-05-25 16:32 edited 2007-05-25 16:32

  There is no graphing object... but that is a great suggestion.
  My guess is that if you are patient... someone will roll it into an object.
  There IS an object that will allow you to export to an Excel spreadsheet, but of course I don't know where it is[noparse]:)[/noparse]
  
  
  Rich
• Martin Hebel Posts: 1,239

  2007-05-25 16:50 edited 2007-05-25 16:50

  I have a graphing object though it's a little specialized I'll try to find time this afternoon to dig it up and see how generalized I can make it for release. It is set up to plot/display 2 channels though the sweep is based on the system counter so is limited to 32 seconds.
  
  -Martin
  
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  StampPlot - GUI and Plotting, and XBee Wireless Adapters
  Southern Illinois University Carbondale, Electronic Systems Technologies
• rjo_ Posts: 1,825

  2007-05-25 17:29 edited 2007-05-25 17:29

  See?
  
  And you didn't have to be very patient, either.
  
  Rich
• Martin Hebel Posts: 1,239

  2007-05-26 16:17 edited 2007-05-26 16:17

  Attached is a test file and "TV_Plot_obj".· It can plot 2 channels of analog data, either floating point or integer.
  
  Here's some usage from the comments (the actual code isn't commented great, sorry):
  

  Example usage:
    Plot    : "TV_Plot_obj" 
    Plot.start
    Plot.MaxTime(20)            ' Set max time in seconds, approximate value
    Plot.MaxVal(100)            ' Set max Y value
    Plot.freshscreen            ' Clean up plot area
    
    Plot.PlotA(5.2)             ' plot data - floats
    Plot.PlotB(fp.ffloat(x))
    Plot.UpdateText(chA,ChB)    ' Updates time and values in text area using float value
    
    Plot.PlotIntA(5)            ' plot data - Integers
    Plot.PlotIntB(X)
    Plot.UpdateIntText(chA,ChB) ' Updates time and values in text area using integers
  
  

  
  
  Time can be any value, though not very accurate, it at least gives you a rough time base.
  
  I tried to take a picture to post, but the picture scan wasn't cooperating.
  
  Hope it helps, it's adopted from a research project I was involved in, which with luck, will be presented at a NATO conference this year!· This was also my 1st attempt working with graphics video.... crash course for the project [noparse]:)[/noparse]
  
  -Martin
  
  ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
  StampPlot - GUI and Plotting, and XBee Wireless Adapters
  Southern Illinois University Carbondale, Electronic Systems Technologies

  zip

  zip

  TV_plot_obj w test file.zip

  31K

  TV_plot_obj w test file.zip 31.5K
• Paul Baker Posts: 6,351

  2007-05-26 16:20 edited 2007-05-26 16:20

  Take a look at microphone_to_vga.spin in the Big Mass of Miscellaneous Objects in the Object Exchange: http://ww1.parallax.com/Default.aspx?tabid=65
  
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  Paul Baker
  Propeller Applications Engineer
  
  Parallax, Inc.