Model engine CDI Autoadvance

[ScaleRobotics]

Yes, you could just use a lookup table, if you want to. I suppose there are advantages and disadvantages to each.

Calculating with line equation:

variable = 85 * RPM
delayangle = (div32 1000) - 60

And for dwell:

variable = 4000 * 32
dwell = div32 RPM

Calculating with a lookup table:

 
                          lookUp ldwell,[0,0,0,0,0,1,2,3,4,5,6,7,8,9,10,11,12,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,_
                                         32,33,34,35,37,38,39,41,42,43,45,46,48,49,51,52,54,56,57,59,61,63,65,67,69,71,73,75,77,79,_
                                         81,84,86,89,91,94,97,99,102,105,108,111,114,118,121,125,128,132,136,140,144,148,153,157,162,_
                                         165,169,172,176,179,183,187,191,196,200,205,210,215,221,227,233,239,246,254],delayangle

A lookup table has at least one advantage:
Code is quicker

Math equation:
Code is smaller (usually)
Quicker to enter new equation than entering a large table (example you want to try a new timing curve)
Results can be more precise.
Can change curve on the fly with only two variables.

I always try to do a math equation. If the math is too dificult, then I default to a table. But that's just my opinion. And there are many, many different ways to solve for "x".