Linear to S Curve conversion

[luminas]

Greetings !
This is my first post, I found this forum is a great place to learn from the experts

I want to convert linear response of a pot to S curve ( see graph below )

<img src=http://i201.photobucket.com/albums/aa306/luminas_photo/Scurve.gif>

I appreciate any suggestion


Jon

[mat janssen]

Try to add a negative sine to your linear curve that must work. Or make a lookup table.

[Darrel Taylor]

Silly me, I was going for a 3rd order polynomial. Doh!

But you're right mat! Add a negative sine.



luminas,

Now I assume there's more information to it.
Obviously you don't want the integer results from 0-10. I'm sure you want some decimals or something.

Can you elaborate a little?

Best regards,

[luminas]

Hi Darrel & Mat,


Thanks for your great information

I want to compensate result of an ADC input ( 0 - 1024 )
what is the formula to do this ?


Jon

[skimask]

Hi Darrel & Mat,
Thanks for your great information
I want to compensate result of an ADC input ( 0 - 1024 )
what is the formula to do this ?
Jon

Look at D_T's last post...the formula is RIGHT THERE.
D_T has already done the hard work for you.

[Darrel Taylor]

...the formula is RIGHT THERE ...

Yeah, well, except that the range is from 0-1023 now, and PBP's SIN function takes a "Binary Radian" input (0-255), giving a result of -127 to 127. Sure, it's all there.

But now we need to line it all up.

Got any idea's?
<br>