# Arduino disconnected

**URL:** <https://discourse.nodered.org/t/arduino-disconnected/18374>\
**Category:** General\
**Created:** [25 November 2019 06:15 UTC](https://discourse.nodered.org/t/arduino-disconnected/18374 "2019-11-25T06:15:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![pranavthakkar](https://avatars.discourse-cdn.com/v4/letter/p/e99b99/32.png) [@pranavthakkar](https://discourse.nodered.org/u/pranavthakkar)\
**Post date:** [25 November 2019 06:15 UTC](https://discourse.nodered.org/t/arduino-disconnected/18374/1 "2019-11-25T06:15:37Z")

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Hi There, I'm using raspberry PI MODEL 3 A+, with arduino board connected in to usb

problem is after some time it is disconnected from raspberry pi, and I have to restart the RPI so that it is connected again.  
How to solve this issue permanently ?

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**Author:** ![dceejay](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dceejay/32/38_2.png) [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [25 November 2019 09:45 UTC](https://discourse.nodered.org/t/arduino-disconnected/18374/2 "2019-11-25T09:45:01Z")

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Why is it disconnecting ? Is there anything in the logs ? Is it busy at the time ? idle at the time ? A fixed period of time ? Same time of day ?

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**Author:** ![pranavthakkar](https://avatars.discourse-cdn.com/v4/letter/p/e99b99/32.png) [@pranavthakkar](https://discourse.nodered.org/u/pranavthakkar)\
**Post date:** [26 November 2019 07:03 UTC](https://discourse.nodered.org/t/arduino-disconnected/18374/3 "2019-11-26T07:03:54Z")

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For all question it's No. I don't know whether it is fixed time busy or not but I think it is disconnected because when i give command through blynk it never turn on.

So I power off and on and then I give command.

Does Rpi's processor lag?

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<div class="post-metadata">

**Author:** ![pranavthakkar](https://avatars.discourse-cdn.com/v4/letter/p/e99b99/32.png) [@pranavthakkar](https://discourse.nodered.org/u/pranavthakkar)\
**Post date:** [30 November 2019 11:14 UTC](https://discourse.nodered.org/t/arduino-disconnected/18374/4 "2019-11-30T11:14:36Z")

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is there another solution for this so that i can work on it?

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**Author:** ![Trying\_to\_learn](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/trying_to_learn/32/28400_2.png) [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)\
**Post date:** [30 November 2019 11:20 UTC](https://discourse.nodered.org/t/arduino-disconnected/18374/5 "2019-11-30T11:20:39Z")

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I would check power.

This has come up in other threads too.

Alternatively what happens if you unplug the ardino and replug it?

Question:  
What do you mean it "disconnects"?

I'm guessing (yes: I have been told) you are sending serial commands to the ardino?

Is the RPI still otherwise functional?  
If so: `lsusb` to see if it sees the USB port.

In NR, set something up which scans the USB ports.  
It gets back a message with _all USB port status_ (or what ever.)

After a while it does it again.  
Compares second reply to first.  
If they are different, it signals you.

That can help determine if there is a time related problem to it _locking up_. (it: the arduino)

Yes, all that is given the RPI is still alive.

But, for your consideration.