Android Question Knob RPM

GabrielM · Dec 15, 2014

Hi,

Looking for an advice on the following:

I have an endless rotating knob view based on Informatix tutorial and would like to measure the rotational speed of the knob. Lets say from a minimum value of zero when the knob is not touched to a Max value of 100 when you make 3 complete knob turns (i.e. 3 x 360 deg) per second.

Any hint on how to come up with a speed related variable based on 1 degree of travel for example, not for each complete knob turn (i.e. 360 deg)?

Thank you

Mrjoey · Dec 15, 2014

try this :

B4X:

Dim FirstValue As Int = 1
            Dim LastValue As Int = 100
            Dim Ratio As Float = (MaxAngle - MinAngle) / (LastValue - FirstValue)
myvalue  = Round((Angle - MinAngle) / Ratio + FirstValue)

this code gives u values from 1 (angle = -135degree) to 100(angle = 135 degree)
now u will add some indicators to see how much "100" was hit and u add +1. hope it helps u.

GabrielM · Dec 15, 2014

Mrjoey said:
try this :

B4X:

Dim FirstValue As Int = 1 Dim LastValue As Int = 100 Dim Ratio As Float = (MaxAngle - MinAngle) / (LastValue - FirstValue) myvalue = Round((Angle - MinAngle) / Ratio + FirstValue)

this code gives u values from 1 (angle = -135degree) to 100(angle = 135 degree)
now u will add some indicators to see how much "100" was hit and u add +1. hope it helps u.

@Mrjoey
Much appreciated, will try this as well, though what I try to do is continuous (endless) rotations not bound by a min or max and count the hits on each degree, and read that value on a timer/ticker.
Thank you

Android Question Knob RPM

GabrielM

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Mrjoey

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GabrielM

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