# Why my nodered cannot detect USB device on my raspberrry pi

**URL:** <https://discourse.nodered.org/t/why-my-nodered-cannot-detect-usb-device-on-my-raspberrry-pi/43572>\
**Category:** General\
**Created:** [2 April 2021 20:36 UTC](https://discourse.nodered.org/t/why-my-nodered-cannot-detect-usb-device-on-my-raspberrry-pi/43572 "2021-04-02T20:36:52Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![alex1](https://avatars.discourse-cdn.com/v4/letter/a/898d66/32.png) [@alex1](https://discourse.nodered.org/u/alex1)\
**Post date:** [2 April 2021 20:36 UTC](https://discourse.nodered.org/t/why-my-nodered-cannot-detect-usb-device-on-my-raspberrry-pi/43572/1 "2021-04-02T20:36:52Z")

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![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/a/5a86e337a37c9faa4953183310023a40d2a86c24.png)

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**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [2 April 2021 20:49 UTC](https://discourse.nodered.org/t/why-my-nodered-cannot-detect-usb-device-on-my-raspberrry-pi/43572/2 "2021-04-02T20:49:29Z")

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Is the USB device plugged into the computer running node-red?

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**Author:** ![alex1](https://avatars.discourse-cdn.com/v4/letter/a/898d66/32.png) [@alex1](https://discourse.nodered.org/u/alex1)\
**Post date:** [2 April 2021 20:51 UTC](https://discourse.nodered.org/t/why-my-nodered-cannot-detect-usb-device-on-my-raspberrry-pi/43572/3 "2021-04-02T20:51:46Z")

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Yes. When I use serial.There will be the output. My device is a barcode scanner

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**Author:** ![alex1](https://avatars.discourse-cdn.com/v4/letter/a/898d66/32.png) [@alex1](https://discourse.nodered.org/u/alex1)\
**Post date:** [2 April 2021 20:53 UTC](https://discourse.nodered.org/t/why-my-nodered-cannot-detect-usb-device-on-my-raspberrry-pi/43572/4 "2021-04-02T20:53:23Z")

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> **[node-red-contrib-usbhid](https://flows.nodered.org/node/node-red-contrib-usbhid)**
>
> A node-hid (USB HID device access library) wrapper for nodered

I just follow the guidelines here. Or do I need to configure anything else?

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [1 June 2021 20:53 UTC](https://discourse.nodered.org/t/why-my-nodered-cannot-detect-usb-device-on-my-raspberrry-pi/43572/5 "2021-06-01T20:53:53Z")

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