Solved: calculating rpm - dc motor with encoder - NI Community

Hey,

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I am currently working (but I think this is an overstatement as I am facing a big problem at the very beginning) with calculating RPM for a project with DC motor - this is an example from the NI website - Motor Adapter for NI myRIO demo. The DC motor has encoder built-in.

I am using The Motor Adapter for NI myRIO, DC Motor/Gearbox (1:19 Gear Ratio), and of course myRIO.

I am trying to determine the rotational speed of the DC motor - in order to do this I am trying to go with steps:

1)Determine the number of shaft encoder counts for one revolution of the gearbox shaft output

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2)Determine the gearbox output shaft angle in degrees.

3)Determine the RPM/RPS of the gearbox output shaft.

And I think I am a bit stuck - I found the gearbox ratio - 1:19 according to digilent website.

Then measuring "by hand" I found the number of encoder counts for one revolution of the sensor magnet - 12. 

Then I am completely stuck. I do not know how to translate these numbers into the rest. Can anyone help me? 

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