[DUG] Chart Smoothing

[Marshland Engineering]

After much searching, I cannot find 3rd part components to use.  Am I search
for the wrong thing ? 

This is version 2 of my dyno. The old version was a bought package that used a
Freq to voltage converter and then an A to D converter for the input to the PC
but he resolution was very poor and I had to do a lot of fiddling with higher
power bikes to get reasonable data.  

My idea with this version is to get as high a resolution as I can.

If you have some time to spare, here is my logic.

The drum speed goes from 45 to 65 kph over 4 seconds. Or 12.5 to 18 m/s 
I'm sampling at 30 hz

Over the time period, I take 120 samples. The average rate of change of each
sample is 0.17 kph. If I take the 0.17m over the average speed range, it is
1/330 or 0.3 %. That is quite optimistic for dyno, but it where I'm starting. 

Each timing period from the drum represents 200mm on the surface and the
ATMEGA can count up to 65535 clock cycles in this period.  My resolution on
the ATMEGA is therefore  0.003 mm per clock cycle.  

I think I have enough resolution for what I want. 

One of the problems is that the wheel to drum, engine speed changes etc are
not exactly linear. I believe this is where the noise is from, however, the
data below the noise is valid.  

I can improve the plots by fewer samples, ie getting a bigger rate of change
between samples but then my resolution will decrease. 

Cheers Wallace.