# Triggering casparcg via GPI of the switcher

**URL:** <https://casparcgforum.org/t/triggering-casparcg-via-gpi-of-the-switcher/1869>\
**Category:** General\
**Created:** [May 22, 2019, 11:17pm UTC](https://casparcgforum.org/t/triggering-casparcg-via-gpi-of-the-switcher/1869 "2019-05-22T23:17:32Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![rrebuffo](https://casparcgforum.org/user_avatar/casparcgforum.org/rrebuffo/32/165_2.png) [@rrebuffo](https://casparcgforum.org/u/rrebuffo)\
**Post date:** [May 23, 2019, 3:08am UTC](https://casparcgforum.org/t/triggering-casparcg-via-gpi-of-the-switcher/1869/2 "2019-05-23T03:08:13Z")

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Take a look at this post:

> [@GPIO howto?](https://casparcgforum.org/t/gpio-howto/507/4):
>
> Or IOCore device [http://www.theatrixx.com/en/product/IOCORE/](http://www.theatrixx.com/en/product/IOCORE/)

It’s fairly easy if you are using custom clients and ATEM switchers. There’s an SDK which lets you grab the M/E status and pass commands to Caspar.  
I implemented that in a playout client that triggers a clip on cue when the input is selected or a transition is started to that input.

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