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Unread 20-02-2003, 22:28
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Greg Ross Greg Ross is offline
Grammar Curmudgeon
AKA: gwross
FRC #0330 (Beach 'Bots)
Team Role: Mentor
 
Join Date: Jun 2001
Rookie Year: 1998
Location: Hermosa Beach, CA
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Quote:
Originally posted by rbayer
Here's the code we use:
p1_y=p1_y_filt+(softChangeCoeff*(2000+p1_y-p1_y_filt)/100) - (20*softChangeCoeff)
p1_x=p1_x_filt+(softChangeCoeff*(2000+p1_x-p1_x_filt)/100) - (20*softChangeCoeff)

it handles all cases and doesn't require any special condition testing
For the last couple of years, we have used the following code to filter our joystick inputs.
Code:
GAIN     con 30
DIVISOR  con 100
newJoystick = ((prevJoystick*(DIVISOR-GAIN)) + (newJoystick*GAIN)) / DIVISOR
I derived my algorithm by rearranging and simplifying IFI's code (basically the same as Rob's code above). I believe that as long as GAIN is chosen to be less than DIVISOR, and DIVISOR is less than 129 (to be extremely safe) mine will work perfectly.

It seems so much more straightforward than IFI's. If anyone can point out why it wouldn't work... or is less than optimal, I would appreciate you pointing it out to me.
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Greg Ross (The Grammar Curmudgeon formerly known as gwross)
S/W Engineer, Team 330, the Beach 'Bots
<--The Grammar Curmudgeon loves this cartoon.
“Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!" Hunter S. Thompson
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