# How to install and use "node-red-contrib-mcp23017"

**URL:** <https://discourse.nodered.org/t/how-to-install-and-use-node-red-contrib-mcp23017/5930>\
**Category:** General\
**Created:** [18 December 2018 09:17 UTC](https://discourse.nodered.org/t/how-to-install-and-use-node-red-contrib-mcp23017/5930 "2018-12-18T09:17:09Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![vlturner](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/vlturner/32/15211_2.png) [@vlturner](https://discourse.nodered.org/u/vlturner)\
**Post date:** [12 January 2020 05:19 UTC](https://discourse.nodered.org/t/how-to-install-and-use-node-red-contrib-mcp23017/5930/16 "2020-01-12T05:19:00Z")

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See reply here

> [@Failing installing node-mcp23017](https://discourse.nodered.org/t/failing-installing-node-mcp23017/20144/17):
>
> I am using MCP23017 but had t do a lot to get it working. The best way to get it working is that you have to be in the directory node-red is installed on, My directory is /hom/pi/.node-red npm install i2c-bus@5.1.0 ├─┬ i2c-bus@5.1.0 │ ├── bindings@1.5.0 deduped │ └── nan@2.14.0 deduped (git+https://github.com/nodejs/nan.git#60e86a9d4c4536fbbd2a76814470edd66b23114e) ├── nan@2.14.0 (git+https://github.com/nodejs/nan.git#60e86a9d4c4536fbbd2a76814470edd66b23114e) You can see I also loaded th…

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