# I don't see current value on servo

**URL:** <https://forum.xod.io/t/i-dont-see-current-value-on-servo/3438>\
**Category:** Uncategorized\
**Created:** [February 6, 2020, 7:45pm UTC](https://forum.xod.io/t/i-dont-see-current-value-on-servo/3438 "2020-02-06T19:45:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![mikola35](https://avatars.discourse-cdn.com/v4/letter/m/dec6dc/32.png) [@mikola35](https://forum.xod.io/u/mikola35)\
**Post date:** [February 6, 2020, 7:45pm UTC](https://forum.xod.io/t/i-dont-see-current-value-on-servo/3438/1 "2020-02-06T19:45:59Z")

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![Screenshot 2020-02-06 at 22.38.26](https://canada1.discourse-cdn.com/flex027/uploads/xod/original/2X/c/c9b3533818b4263f60e14306f29a3c25588d1d7f.png)

I think I should to see 0.34 on the node from **position-value - VAL**  
but I see only 0.52 and this value don’t changes when I change value from potentiometer. Also servo is moving.

How I can fix it?

And what exactly mean **Pmin Pmax** in **servo-device**?

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**Author:** ![cesars](https://avatars.discourse-cdn.com/v4/letter/c/f05b48/32.png) [@cesars](https://forum.xod.io/u/cesars)\
**Post date:** [February 7, 2020, 1:20am UTC](https://forum.xod.io/t/i-dont-see-current-value-on-servo/3438/2 "2020-02-07T01:20:07Z")

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try pulse-on-change from `map` output to UPD

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**Author:** ![gweimer](https://avatars.discourse-cdn.com/v4/letter/g/a9adbd/32.png) [@gweimer](https://forum.xod.io/u/gweimer)\
**Post date:** [February 7, 2020, 6:37am UTC](https://forum.xod.io/t/i-dont-see-current-value-on-servo/3438/3 "2020-02-07T06:37:54Z")

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You are creating 2 different servo devices attached to the same pin. servo includes code to create a servo & move it, then you create a different servo device and request position of it. You can’t use the xod-dev/servo/servo short-cut if you want to be able to query the position later. You will need to create a single servo device & pass it to both rotate and position-value. Open the servo patch, and you will see how it is actually coded.

FYI: position-value is just returning where you’ve asked the servo to move to. Standard servos have no way to report their actual position.

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**Author:** ![system](https://canada1.discourse-cdn.com/flex027/uploads/xod/original/1X/eb7348baa04192c2ef932d1db54d44f09f8a7888.png) [@system](https://forum.xod.io/u/system)\
**Post date:** [February 9, 2020, 6:37am UTC](https://forum.xod.io/t/i-dont-see-current-value-on-servo/3438/4 "2020-02-09T06:37:55Z")

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Closed on February 9, 2020, 6:37am UTC

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