## Mathimatical question

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jbs4wd
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### Mathimatical question

If I set 'A' at 100 and set 'B' at 200. How do I make a adc input 'C' with full range (0 -255) work at full range between A & B? Then if I Change 'B' to 150, C still need to operate at full rang , but between A & B.
C is a pot opperating between 0-5V.
I can achieve this through hardware, but would like to downsize on components.

Cheers
JOHN

Dan81
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### Re: Mathimatical question

Hello John

If I understand your question :

D=B when C=255 and D=A when C=0.

D = (((B-A)*C)/255) + A ; D must be an integer.
Be careful with the brakets or accuracy will be lost

If it is not the right answer : sorry ,i will remove it .

Daniel
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medelec35 (Wed Nov 17, 2010 7:48 pm)
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jbs4wd
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### Re: Mathimatical question

Thanks heaps. I nearly had it. Will give it go but I think you're on the money there

Thanks
JOHN

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### Re: Mathimatical question

Daniel

Thanks again. It was spot on.

Cheers
JOHN

medelec35
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### Re: Mathimatical question

Dan81 wrote:D=B when C=255 and D=A when C=0.

D = (((B-A)*C)/255) + A ; D must be an integer.
Be careful with the brakets or accuracy will be lost
Daniel

Dan that is a very useful equation. I have used it quit a bit now. I wished I had your maths skills
Thank you
Martin

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