Scaling TigerStops - TigerStop/TigerStopSDK GitHub Wiki

Simple way to scale a TigerStop

In all TigerStops from ver 5.0 on the scale is used to convert encoder counts to inches. The math for this is y = mx + b.

m = scale x = encoder counts b = offset y = position in inches

In the system now, offset always = 0, when you calibrate the TS, I set the count to the raw count so zero is always zero for encoder counts and inches.

So we have y = mx, inches = scale * encoder counts. This makes calibration & scaling very easy.

NewScale = OldScale * Position / Realposition

old scale = 2.362 Position = 100.00 Real pos = 99.9

NewScale = 2.362 * 100 / 99.9 NewScale = 2.36436

So what falls out of this is

Calibrate as near zero as you can, sets the offset to zero
move to the longest length you can measure (Longer really is better)
calculate the new scale from above
enter the new scale value
DONE