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one person kart scales
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joseph hollinger



Joined: 12 Sep 2002
Posts: 9480
Location: United States, California, san francisco

PostPosted: Wed May 07, 2008 9:54 am    Post subject: Reply with quote

Jacob Hennie wrote:
Joseph, VERY IMPRESSIVE!! Did you use MFC? Which VC++? 6?

Been a C++ programmer myself, signal intelligence/electronic warfare systems, In-flight entertainment systems, now a software manager for a GPS company. The funnest stuff was always multi-threaded apps in WinCE........

Again, great job, and very cool!

Tom Hennie


I used Visual C++ 2008 Express. It's available for free download which I figured would allow other people to modify the code if they want. In a former life, I used to develop compilers for C, C++ and FORTRAN. Strangely, that only required that I know C and I really know very, very little about C++. This project was sort of a vehicle to fix some of that and get me used to programming in windows. Basically, a lot of fun.
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Seth Blackburn



Joined: 27 Oct 2004
Posts: 680
Location: United States, North Carolina,

PostPosted: Wed May 07, 2008 7:12 pm    Post subject: Reply with quote

Something free from Microsoft (especially compilers)? Wow....

I've never really used Visual anything, mostly just text editors and Eclipse in Linux. I suck at C programming, I'm going to be taking Java in the fall though (with a different teacher who supposedly can teach programming better). Please send me a copy of your program too when you get a chance.
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Chris M Johnson



Joined: 14 Oct 2005
Posts: 568

PostPosted: Wed May 07, 2008 7:16 pm    Post subject: Reply with quote

I have four bathroom scales with vinyl floor tile shims.

I used a paint pen to mark the outline of each scale on the garage floor, and wrote down the number of shims for each.

I used 75lbs of free weights to calibrate each scale.

I duct taped a small mirror on the end of a coathanger so I can read the scales from sitting in the kart.

Cost: Really cheap.


Works great!
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joseph hollinger



Joined: 12 Sep 2002
Posts: 9480
Location: United States, California, san francisco

PostPosted: Wed May 07, 2008 8:05 pm    Post subject: Reply with quote

Seth Blackburn wrote:
Something free from Microsoft (especially compilers)? Wow....

I've never really used Visual anything, mostly just text editors and Eclipse in Linux. I suck at C programming, I'm going to be taking Java in the fall though (with a different teacher who supposedly can teach programming better). Please send me a copy of your program too when you get a chance.


I too was a little surprised that they gave away anything for free. I'll send copies to everyone when the code looks a little better (next week).
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Dan Haynes



Joined: 17 Sep 2007
Posts: 2372
Location: United States, Pennsylvania, Ellwood City

PostPosted: Wed May 07, 2008 8:40 pm    Post subject: Reply with quote

i've had an intro to java course. pretty easy. just gotta a little frustrating with the if/else, if/else/if and whatever if's and else's they threw at us Shocked .
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joseph hollinger



Joined: 12 Sep 2002
Posts: 9480
Location: United States, California, san francisco

PostPosted: Thu May 08, 2008 10:18 am    Post subject: Reply with quote

Dan Haynes wrote:
i've had an intro to java course. pretty easy. just gotta a little frustrating with the if/else, if/else/if and whatever if's and else's they threw at us Shocked .


These days, the problem is that there are so many languages and platforms that it's difficult to pick. MS offers free versions of C++ and C# (whatever that is) along with Visual Basic (which is gross). It's all rather dismaying. My scales program is written using a package called .NET. I don't even have a good idea what .NET is supposed to be.
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Seth Blackburn



Joined: 27 Oct 2004
Posts: 680
Location: United States, North Carolina,

PostPosted: Thu May 08, 2008 10:47 am    Post subject: Reply with quote

Yeah, several years ago when I was in high school a friend let me borrow a errr...special edition... of Visual Studio .NET. I had to go through a lot of crap to download and install ".NET" and from what I could tell it didn't do anything but allow me to run the program. I also didn't know anything about programing back then, so it really didn't matter.

I've been lost in my C course since after the first couple weeks. Once we started getting into functions, and pointers, and if statements, it all went down hill. My teacher is a freakin genius with programming (and electronics in general) I think she just doesn't understand how hard it is for a complete newb to understand.
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Dave Stevens



Joined: 18 Jul 2001
Posts: 2021
Location: United States, Nevada, Vegas Baby

PostPosted: Mon May 12, 2008 12:07 pm    Post subject: Reply with quote

C# (C sharp) is Microsoft's implementation of an object oriented language based on among other things C++. .Net is a framework that enables different languages and libraries to interact and build apps for the various Windows platforms while minimizing to a certain extent some of the complexity. For example allowing someone with limited programing skills to make a nifty little scale app or on a larger scale allowing teams of developers an easier way to manage projects and wrap non complementary technologies into a unified app.

If you want to learn to program start with VB (or another basic) and get the foundation before you move to C or something else. If you can't get the basics like declarations, conditional branches, loops, statements and functions you're going to have a difficult time doing anything more robust than basic drag and drop object functionality. Programming isn't for everyone, in fact to do it well is pretty difficult. Not everyone can do it.

BTW, GREAT job Joe on the scale project. I've been looking for used scales and tired to find some of these others used, but no luck at a cheap price. Most of what I see they want a couple hundred bucks per pad.

Dave
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joseph hollinger



Joined: 12 Sep 2002
Posts: 9480
Location: United States, California, san francisco

PostPosted: Mon May 12, 2008 12:14 pm    Post subject: Reply with quote

Dave Stevens wrote:
I've been looking for used scales and tired to find some of these others used, but no luck at a cheap price. Most of what I see they want a couple hundred bucks per pad.

Dave


I know that the ultegras that I used can be hard to find. In fact, I bought mine one at a time over about two months. I also know that someone on EKN (can't remember their name) used this type of scale with good results (and they are more available and seem to be very cheap):

http://cgi.ebay.com/Fairbanks-digital-Shipping-Scale-calibrated-70-2453-4_W0QQitemZ270235159568QQihZ017QQcategoryZ50954QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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Billy Smith



Joined: 31 Mar 2006
Posts: 424
Location: United States, Illinois, Chicago

PostPosted: Tue May 13, 2008 4:43 pm    Post subject: Reply with quote

Your kart and your garage are both impressively clean.
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Good Bye



Joined: 18 Mar 2006
Posts: 262
Location: Afghanistan, No Where, No Where

PostPosted: Tue May 13, 2008 5:57 pm    Post subject: Reply with quote

While we are on this subject, does anyone know of shipping scale models that DON'T have "auto off" features or who's "auto-off" feature can be disabled?
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joseph hollinger



Joined: 12 Sep 2002
Posts: 9480
Location: United States, California, san francisco

PostPosted: Thu May 15, 2008 1:53 pm    Post subject: Reply with quote

Frank Cire wrote:
While we are on this subject, does anyone know of shipping scale models that DON'T have "auto off" features or who's "auto-off" feature can be disabled?


The fairbanks scales that I use don't auto off. Salter Brecknell PS400's have that feature but it can be disabled by menu.
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Al Barnes



Joined: 11 Oct 2005
Posts: 478

PostPosted: Thu May 15, 2008 2:48 pm    Post subject: Reply with quote

Very nice system! For your next upgrade you could put cubes under the front tires in order to determine the CG of the kart & driver. I could send you the formula if you need it.
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Mike Goebel



Joined: 28 Jul 2001
Posts: 5765
Location: United States, California, Winnetka

PostPosted: Thu May 15, 2008 3:18 pm    Post subject: Reply with quote

Al Barnes wrote:
I could send you the formula if you need it.



Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing Laughing


Mike G.
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Gary Osterholt
Site Admin


Joined: 18 Jul 2001
Posts: 2769

PostPosted: Thu May 15, 2008 7:30 pm    Post subject: Reply with quote

Al,

I know I could get the X and Y CG very easily, but don't know about the Z component.

Gary
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