# My hc 05 bluetooth module isn't working at all

**URL:** <https://forum.arduino.cc/t/my-hc-05-bluetooth-module-isnt-working-at-all/1169701>\
**Category:** General Electronics\
**Created:** [September 18, 2023, 4:34pm UTC](https://forum.arduino.cc/t/my-hc-05-bluetooth-module-isnt-working-at-all/1169701 "2023-09-18T16:34:26Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![cattledog](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/cattledog/32/217816_2.png) [@cattledog](https://forum.arduino.cc/u/cattledog)\
**Post date:** [September 18, 2023, 5:59pm UTC](https://forum.arduino.cc/t/my-hc-05-bluetooth-module-isnt-working-at-all/1169701/6 "2023-09-18T17:59:38Z")

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> [@anon34785593](#):
>
> I've been trying to use AT mode on my Bluetooth board using a freenove control board aka Arduino Uno

There are two methods for using AT mode. One involves a blank sketch and a pass through method with Rx\>Rx and Tx\>Tx.  
[https://howtomechatronics.com/tutorials/arduino/how-to-configure-pair-two-hc-05-bluetooth-module-master-slave-commands/](https://howtomechatronics.com/tutorials/arduino/how-to-configure-pair-two-hc-05-bluetooth-module-master-slave-commands/)

The other involves using a software serial connection with Rx\>Tx and Tx\>Rx.  
[https://forum.arduino.cc/t/setting-hc05-zs-040-to-at-mode/1059616](https://forum.arduino.cc/t/setting-hc05-zs-040-to-at-mode/1059616)

Which method are you trying to use?

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