# Node-red-contrib-i2c

**URL:** <https://discourse.nodered.org/t/node-red-contrib-i2c/94173>\
**Category:** General\
**Created:** [26 December 2024 10:22 UTC](https://discourse.nodered.org/t/node-red-contrib-i2c/94173 "2024-12-26T10:22:06Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Le-Ze](https://avatars.discourse-cdn.com/v4/letter/l/a87d85/32.png) [@Le-Ze](https://discourse.nodered.org/u/Le-Ze)\
**Post date:** [26 December 2024 10:22 UTC](https://discourse.nodered.org/t/node-red-contrib-i2c/94173/1 "2024-12-26T10:22:06Z")

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Good morning.

> **[node-red-contrib-i2c](https://flows.nodered.org/node/node-red-contrib-i2c)**
>
> A Node-RED node to talk to the Raspiberry PI's I2C port

I have Node-Red on Raspberry.  
I have been connected by 3 expander for 4 years.  
I use via bash script and work.  
sudo i2cdetect -y 1  
Are at 20,21,22.  
The IC2 Scaner node shows [32,33,34]  
Why?

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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:** [26 December 2024 10:35 UTC](https://discourse.nodered.org/t/node-red-contrib-i2c/94173/2 "2024-12-26T10:35:38Z")

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20 hexadecimal == 32 decimal  
21 hexadecimal == 33 decimal  
...

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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:** [26 March 2025 10:36 UTC](https://discourse.nodered.org/t/node-red-contrib-i2c/94173/3 "2025-03-26T10:36:24Z")

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