# About radio and joystick

**URL:** <https://discuss.bluerobotics.com/t/about-radio-and-joystick/389>\
**Category:** General Discussion\
**Created:** [July 15, 2016, 11:29am UTC](https://discuss.bluerobotics.com/t/about-radio-and-joystick/389 "2016-07-15T11:29:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![kl845002185](https://avatars.discourse-cdn.com/v4/letter/k/e19adc/32.png) [@kl845002185](https://discuss.bluerobotics.com/u/kl845002185)\
**Post date:** [July 15, 2016, 11:29am UTC](https://discuss.bluerobotics.com/t/about-radio-and-joystick/389/1 "2016-07-15T11:29:52Z")

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1.If I want to use a radio to send commands and a wirwless receptor(put on the pixhawk), can the conmunication happens when the robot is underwater？(The water is 1 meter deep)

2.If I cannot do that, then if I want to use a joystick to directly connect to the pixhawk using usb line, how to connect and how to let the commnication happens?

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**Author:** ![jwalser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/jwalser/32/2234_2.png) [@jwalser](https://discuss.bluerobotics.com/u/jwalser)\
**Post date:** [July 17, 2016, 2:32am UTC](https://discuss.bluerobotics.com/t/about-radio-and-joystick/389/2 "2016-07-17T02:32:47Z")

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2.4ghz radios and receivers will not work underwater.

You need to have digital communications with a laptop. This can be achieved with a raspberry pi and ethernet cable, or the BR serial tether interface boards.

-Jacob

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**Author:** ![rjehangir](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/rjehangir/32/671_2.png) [@rjehangir](https://discuss.bluerobotics.com/u/rjehangir)\
**Post date:** [July 17, 2016, 4:33am UTC](https://discuss.bluerobotics.com/t/about-radio-and-joystick/389/3 "2016-07-17T04:33:37Z")

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Hi WYK,

1. No, radio signals do not travel through water well.

2. You can connect to the Pixhawk directly with USB and then connect to it with a joystick in QGroundControl. Please see the ArduSub instructions at [ardusub.com](http://ardusub.com).

-Rusty