2012/3/4 Andrew <[email protected]>:
> Hello,
>
> I have two encoders on one axis, and I'd like to see the difference between
> their readings with hal scope. The first encoder is on the motor, it's
> 'axis.0.motor-pos-fb', and the second linear encoder is connected to
> 'axis.1.motor-pos-fb' (just for some tests, not a working config).
> I'm not much familiar with HAL... how do I get the
> difference 'axis.0.motor-pos-fb' - 'axis.1.motor-pos-fb'  on the scope?
>

You can use "scale" module to multiply the second pin by -1 and then
sum both of them in "sum2" component and then You can watch the
sum2.0.out pin in HAL Scope

Viesturs

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