# Altmill Y2 Limit Sensor

**URL:** <https://forum.sienci.com/t/altmill-y2-limit-sensor/16324>\
**Category:** ❓ Something's Up\
**Created:** [March 1, 2025, 2:13pm UTC](https://forum.sienci.com/t/altmill-y2-limit-sensor/16324 "2025-03-01T14:13:49Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Spamming\_Eddie](https://forum.sienci.com/user_avatar/forum.sienci.com/spamming_eddie/32/7296_2.png) [@Spamming\_Eddie](https://forum.sienci.com/u/Spamming_Eddie)\
**Post date:** [March 1, 2025, 2:58pm UTC](https://forum.sienci.com/t/altmill-y2-limit-sensor/16324/2 "2025-03-01T14:58:38Z")

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Hey Harry,

I have gone back into the manual and found a remark at the limit switch part of the slb manual. I have no idea if it is still valid or needs updating, but it might be that this is the source of your problem?

 ![Screenshot_20250301-155525_Chrome](https://forum.sienci.com/uploads/default/original/2X/b/b0e6b4dee09ce2f326515c65fd110874f866650e.jpeg)

> **[Technical Manual - SuperLongBoard](https://resources.sienci.com/view/slb-manual/#homing-amp-limit-switches)**
>
> Documentation for the SuperLongBoard, a next-generation, 32-bit control board for the LongMill and other CNC routers. Includes electrical and mechanical specs.

The latest post by Chris on auto squaring (needing the 2 y sensors) was Jan this year. It was an early beta version. He even released a -at your own risk- trial in the last post in this thread here:

> [@Auto-squaring on the SLB](https://forum.sienci.com/t/auto-squaring-on-the-slb/13753):
>
> Hello folks, Has anyone setup auto-squaring on the SLB yet? Tutorial please? How to enable in grblHAL and re-upload firmware? Is this supported? Is there a firmware builder in gsender? On this note, can gsender be installed on an intel based PC with Linux Ubuntu as the OS? Is this the version labeled as RPi? Or is the RPi version of gsender only for RPi? Thanks, Tyler

Please note the pretty clear warning posted on using this u tested feature:

 ![Screenshot_20250301-162015_Chrome](https://forum.sienci.com/uploads/default/original/2X/8/89f3f8963c573557a7198a8e55f3bd8c9b07130e.jpeg)

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