Hey nerds, I need some math help. I feel like an idiot but, I can't figure this out. I am writing some JavaScript for two way feedback for a Parasound preamp. Volume scale runs from decimal 10 = 0% to 106 = 100% or .96/step. I want to convert to 0-100% scale in the GUI but, I am too stupid to figure out the math. I can write the script (parse hex and ASCII, yes both > convert to decimal > apply formula), I just don't understand what the formula needs to be. Can some one help me out?

Why not start at 106 = 100 and not bother with the difference at the low end? That little bit of "on" volume setting isn't useful, anyway.

Subtract 10 and call decimal 96 as the highest level?

Feedback -- percent
10 ( -10) == 0%
50 ( -10) == 40%
106 ( -10) == 96%

Ever going to go above 96%?

I know it's driving you crazy to not be able to do it the 'right' way, though...lol.... but the scale will be accurate, you will just never get that top 4%.

Accuracy and proper scaling. If I ignore the difference on the low end, the scale will be off throughout the range. That and I just want to understand the flippin' math (not a strong suit).

Scaled Volume = (Reported Volume - 10) / .96

Bruce

Thought about it again.

Subtract 10 from the decimal feedback
Divide that number by 96

Gives you a full percentage range from 0% - 100%. It's about 1.04% ~ 1.05% between each step.

Thank you gentlemen. That's what I needed. Glad I can count on other's brains around here.

That's just it Anthony; you can't count  :-)

D'oh!