# SOS! Lost communication with MCU!

**URL:** <https://klipper.discourse.group/t/sos-lost-communication-with-mcu/11796>\
**Category:** General Discussion\
**Created:** [November 23, 2023, 3:37am UTC](https://klipper.discourse.group/t/sos-lost-communication-with-mcu/11796 "2023-11-23T03:37:28Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\
**Post date:** [November 23, 2023, 6:55pm UTC](https://klipper.discourse.group/t/sos-lost-communication-with-mcu/11796/8 "2023-11-23T18:55:15Z")

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@Maerians & @andora1968

> [@mykepredko](#):
>
> I’m just curious, why are you not using USB?

mykepredko is absolutely right.

Since both of you are new here, you might read [How-To Trouble-Shoot](https://klipper.discourse.group/t/how-to-trouble-shoot/6326)  
Search for " Connection Problems to the Printer Board"  
… and of course use USB, not UART!

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