# How to control the Bluetooth module BLE 33 underwater

**URL:** <https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482>\
**Category:** General Guidance\
**Created:** [July 27, 2022, 6:03am UTC](https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482 "2022-07-27T06:03:57Z")\
**Posts on this page:** 5\
**Page:** 2

<div class="post-metadata">

**Author:** ![Paul\_KD7HB](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/paul_kd7hb/32/1127958_2.png) [@Paul\_KD7HB](https://forum.arduino.cc/u/Paul_KD7HB)\
**Post date:** [July 28, 2022, 12:27am UTC](https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482/21 "2022-07-28T00:27:23Z")

</div>

> [@Paul\_B](#):
>
> (§: _Very Low Frequency_ wireless communication is I believe used - in one direction - base to sub.)

Correct, and using very slow CW (Morse code). And even then subject to errors, so multiple retransmissions to hope get the messeag.

---

<div class="post-metadata">

**Author:** ![tom321](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/tom321/32/1126662_2.png) [@tom321](https://forum.arduino.cc/u/tom321)\
**Post date:** [July 28, 2022, 4:04am UTC](https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482/22 "2022-07-28T04:04:53Z")

</div>

> [@kuralkaeakshay](#):
>
> could any buddy pls tell me what solution for my problem.

If it is a salt water only floating antenna, or sonar, in fresh water you can use CB radio up to 20 m deep.

---

<div class="post-metadata">

**Author:** ![tom321](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/tom321/32/1126662_2.png) [@tom321](https://forum.arduino.cc/u/tom321)\
**Post date:** [July 28, 2022, 4:07am UTC](https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482/23 "2022-07-28T04:07:35Z")

</div>

> [@tom321](#):
>
> If it is a salt

for short range use 5kHz

---

<div class="post-metadata">

**Author:** ![J-M-L](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/j-m-l/32/766245_2.png) [@J-M-L](https://forum.arduino.cc/u/J-M-L)\
**Post date:** [July 28, 2022, 12:01pm UTC](https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482/24 "2022-07-28T12:01:07Z")

</div>

> [@tom321](#):
>
> for short range use 5kHz

Indeed - the lower the better (3 to 30 Hz)

➜ which is pretty far away from the 2,4GHz of WiFi or BT...

some reading ➜ [https://www.diva-portal.org/smash/get/diva2:1148743/FULLTEXT01.pdf](https://www.diva-portal.org/smash/get/diva2:1148743/FULLTEXT01.pdf)

---

<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [January 24, 2023, 12:01pm UTC](https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482/25 "2023-01-24T12:01:52Z")

</div>

Closed on January 24, 2023, 12:01pm UTC

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.

[Previous page](https://forum.arduino.cc/t/how-to-control-the-bluetooth-module-ble-33-underwater/1016482.md?page=1)