# Sensors DS18B20 detected by Linux but no by NR

**URL:** <https://discourse.nodered.org/t/sensors-ds18b20-detected-by-linux-but-no-by-nr/41970>\
**Category:** General\
**Created:** [3 March 2021 17:59 UTC](https://discourse.nodered.org/t/sensors-ds18b20-detected-by-linux-but-no-by-nr/41970 "2021-03-03T17:59:23Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mune](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mune/32/37105_2.png) [@mune](https://discourse.nodered.org/u/mune)\
**Post date:** [3 March 2021 17:59 UTC](https://discourse.nodered.org/t/sensors-ds18b20-detected-by-linux-but-no-by-nr/41970/1 "2021-03-03T17:59:24Z")

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If I use the shell the sensors are attached:

```auto
pi@vrvtest:~ $ ls /sys/bus/w1/devices/
28-00000cbece94 28-00000cbf87ba 28-01203366920f w1_bus_master1

```

but in the NR node the drop down list is empty

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**Author:** ![ghayne](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ghayne/32/39_2.png) [@ghayne](https://discourse.nodered.org/u/ghayne)\
**Post date:** [3 March 2021 18:04 UTC](https://discourse.nodered.org/t/sensors-ds18b20-detected-by-linux-but-no-by-nr/41970/2 "2021-03-03T18:04:48Z")

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Which contrib node are you using?

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<div class="post-metadata">

**Author:** ![mune](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mune/32/37105_2.png) [@mune](https://discourse.nodered.org/u/mune)\
**Post date:** [3 March 2021 18:15 UTC](https://discourse.nodered.org/t/sensors-ds18b20-detected-by-linux-but-no-by-nr/41970/3 "2021-03-03T18:15:45Z")

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I was using plain ds18b20 (which should give all the sensor to choose the one in a drop list, but it was empty), now I'm using `rpi ds18b20` which works and returns msg.paylod with an array with all the sensors ID+value; perfect!

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**Author:** ![ghayne](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ghayne/32/39_2.png) [@ghayne](https://discourse.nodered.org/u/ghayne)\
**Post date:** [3 March 2021 18:21 UTC](https://discourse.nodered.org/t/sensors-ds18b20-detected-by-linux-but-no-by-nr/41970/4 "2021-03-03T18:21:51Z")

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That's the first time I got "Solution" by asking a question. Glad it worked for you!  
One thing worth mentioning is that it is always good practice to visit the GitHub page of the node, just in case the node has not been updated for a long time!

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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:** [17 March 2021 18:22 UTC](https://discourse.nodered.org/t/sensors-ds18b20-detected-by-linux-but-no-by-nr/41970/5 "2021-03-17T18:22:09Z")

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