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Ardiuno opto interrupter RPM

Hi,

 

Pretty new to Labview and struggling to find a solution to this. I want to read the RPM of a DC motor. I have an opto interrupter attached to the axel of the DC motor which has 20 slots in it.

 

I am not sure where in Labview to start. I have Labview reading when the interrupt signal is being activated on a digital pin (7) from the arduino using LINX. So in my head what I would like to do is count how long it takes to activate that digital pin 7 times and then calculate that to RPM.

 

Any help would be greatly appreciated.

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