# What is Attn Pin Timing?

**URL:** <https://discuss.blues.com/t/what-is-attn-pin-timing/145>\
**Category:** Hardware\
**Created:** [February 22, 2021, 10:55pm UTC](https://discuss.blues.com/t/what-is-attn-pin-timing/145 "2021-02-22T22:55:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Pat](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/pat/32/143_2.png) [@Pat](https://discuss.blues.com/u/Pat)\
**Post date:** [February 22, 2021, 10:55pm UTC](https://discuss.blues.com/t/what-is-attn-pin-timing/145/1 "2021-02-22T22:55:05Z")

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How long does the Attn Pin go low when activated?

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**Author:** ![zfields](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/zfields/32/29_2.png) [@zfields](https://discuss.blues.com/u/zfields)\
**Post date:** [February 22, 2021, 11:52pm UTC](https://discuss.blues.com/t/what-is-attn-pin-timing/145/2 "2021-02-22T23:52:10Z")

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Hello Pat!

The `ATTN` pin is a latching interrupt. It is `HIGH` in the unarmed state, and will be pulled `LOW` when armed. Once it has “fired”, the line goes `HIGH` and will remain there until rearmed.

We have put together an [Attention Pin ( `ATTN` ) Guide](https://dev.blues.io/build/notecard-guides/configuring-esp32-attention-pin/#attention-pin-guide) which goes into depth about how it functions. The writing is tailored for the Feather Starter Kit, but the principals remain the same. If you have any questions not addressed in the guide, please put those in this thread. I’ll be sure to give you an answer, as well as update the guide.

Thanks,  
Zak

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**Author:** ![Pat](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/pat/32/143_2.png) [@Pat](https://discuss.blues.com/u/Pat)\
**Post date:** [February 23, 2021, 12:04am UTC](https://discuss.blues.com/t/what-is-attn-pin-timing/145/3 "2021-02-23T00:04:37Z")

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Thanks @zfields . Just what I needed.