The Story of My ECG 

Monster 4 - No, these aren't Digimons

I am not being completely truthful here.  I didn't just build the analog circuit and magically it worked.  I had to program a little Visual Basic so I could debug what's wrong with all of my previous analog designs.  However, let's just pretend that I built the analog portion and now I need to do the Visual Basic (digital) part.   

You've got analog - the computer's

I needed a way to interface the amplified analog signal, and display it on my computer.  However, I didn't want to go out and spend $3 on a nifty Analog-to-Digital converter., cheap, cheap!  I realized that I could use my computer's sound card as a natural Analog-to-Digital converter.  In addition, this thing is 16-bits accurate, high speed, and almost everyone has one.  So, that was my plan, and I stuck with it.

It had been years since I programmed in Visual Basic, but I knew that would be the easiest and fastest way for me to program a nice graphical user interface.  So I pulled out my dusty textbooks and started programming again.  Unfortunately, I had no experience getting data from a computer's sound card.  Luckily, someone had already developed a similar program.  (Thanks Murphy McCauley!)  I used Murphy's code a lot in debugging my code and figuring out how DLL's work.  Eventually, I figured out how to get data from the input of the sound card.  With the hard part behind me, I put together a simple graphical output.  Here's the code:

Private Sub Form_Load()
    MsgBox "Hello World!"
End Sub

Simple, huh?  No, the real code is in this secret zip file.  As well as a precompiled .exe

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