# Error: Arduino Serial port closed when connecting to arduino Uno

**URL:** <https://discourse.nodered.org/t/error-arduino-serial-port-closed-when-connecting-to-arduino-uno/82934>\
**Category:** General\
**Created:** [16 November 2023 16:31 UTC](https://discourse.nodered.org/t/error-arduino-serial-port-closed-when-connecting-to-arduino-uno/82934 "2023-11-16T16:31:05Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![zenofmud](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zenofmud/32/316_2.png) [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Post date:** [17 November 2023 01:19 UTC](https://discourse.nodered.org/t/error-arduino-serial-port-closed-when-connecting-to-arduino-uno/82934/6 "2023-11-17T01:19:31Z")

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Which node-red are you using to send the true to the arduino ?  
Please export your flow and attach it to a reply

In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote `````)

````auto
``` 
   code goes here 
```

````

You can edit and correct your post by clicking the pencil ✏ icon.

See this post for more details - [How to share code or flow json](https://discourse.nodered.org/t/how-to-share-code-or-flow-json/506)

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