# Arduino node red connection

**URL:** <https://discourse.nodered.org/t/arduino-node-red-connection/20765>\
**Category:** General\
**Created:** [23 January 2020 10:20 UTC](https://discourse.nodered.org/t/arduino-node-red-connection/20765 "2020-01-23T10:20:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Prashu](https://avatars.discourse-cdn.com/v4/letter/p/2bfe46/32.png) [@Prashu](https://discourse.nodered.org/u/Prashu)\
**Post date:** [23 January 2020 10:20 UTC](https://discourse.nodered.org/t/arduino-node-red-connection/20765/1 "2020-01-23T10:20:33Z")

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How can I read the string from serial input and print the output string in serial out at the same time via same serial port in node-red.

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [23 January 2020 13:51 UTC](https://discourse.nodered.org/t/arduino-node-red-connection/20765/2 "2020-01-23T13:51:28Z")

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Which bit don't you know how to do? Have a look at the serial port nodes to start with.

> **[node-red-node-serialport](https://flows.nodered.org/node/node-red-node-serialport)**
>
> Node-RED nodes to talk to serial ports