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LERP micro

LERP is linear interpolation.
It is quite simple: it converts range (x1,x3) to range (y1,y3).
It is very versatile: simple or augmented versions can replace PID in multiple cases.

You can stabilise boat rolling with a tilt sensor -> LERP -> horizontal fins.
You can control engine RPS by using an augmented LERP (see my other uploads, "LERP as PID").

You can read up on wikipedia for more details.