DIY COB LED Calculator

bggrass

bggrass

Well-Known Member
BOBBY_G said:
those apply to the one single chip that supra measured. you could easily derive an equation from crees data as well *IF* they presented data below 1.4A which they do not, which is why i used supras data
Click to expand...
Thanks Bobby
 
bggrass

bggrass

Well-Known Member
I found this program that is supposed to digitize a graph from a jpeg file. I thought if I can get it to work, I can plug in the graphs from the cree datasheets and that could give us the formulas. If that happens, I might be able to just create a box for input amperage which will give more flexibility, let's say someone wants to use a driver with an amperage that is not in the spreadsheets, it will still calculate everything at that amperage. The problem is, I can't get it to run on my computer. I think it's something to do with my OS. Here's the link and a sample graph if someone wants to play with it.

http://digitizer.sourceforge.net/
 

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Mr. Candiano

Mr. Candiano

Active Member
bggrass said:
I found this program that is supposed to digitize a graph from a jpeg file. I thought if I can get it to work, I can plug in the graphs from the cree datasheets and that could give us the formulas. If that happens, I might be able to just create a box for input amperage which will give more flexibility, let's say someone wants to use a driver with an amperage that is not in the spreadsheets, it will still calculate everything at that amperage. The problem is, I can't get it to run on my computer. I think it's something to do with my OS. Here's the link and a sample graph if someone wants to play with it.

http://digitizer.sourceforge.net/
Click to expand...
Your really putting in work brother. Your going to make me buy a PC or android phone.
 
klx

klx

Well-Known Member
bggrass said:
I found this program that is supposed to digitize a graph from a jpeg file. I thought if I can get it to work, I can plug in the graphs from the cree datasheets and that could give us the formulas. If that happens, I might be able to just create a box for input amperage which will give more flexibility, let's say someone wants to use a driver with an amperage that is not in the spreadsheets, it will still calculate everything at that amperage. The problem is, I can't get it to run on my computer. I think it's something to do with my OS. Here's the link and a sample graph if someone wants to play with it.

http://digitizer.sourceforge.net/
Click to expand...
Cant get it to work either. I tried to install the missing dll and still no go.
 
klx

klx

Well-Known Member
Mr. Candiano said:
I tried everything, don't think it's going to happen on iPhone iPad
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Nah the tool works fine for me, I was referring to the digitizer app. You wont be able to use the tool on those devices as you cant run Java I dont think.
 
bggrass

bggrass

Well-Known Member
klx said:
Cant get it to work either. I tried to install the missing dll and still no go.
Click to expand...
I get the same error on my PC with windows. I have an older computer that I installed Ubuntu on it, but I'm not very good at it. Tried it there but I can't seem to find the application file to start the program...
 
audiophilepj

audiophilepj

Member
Love the calculator, thx! Only issue: Can't resize the program window... must be a java issue. 1.0 was larger then my laptop display, 2.0 cuts off the left edge. No resizing options available.

Thanks again,
 
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