# Node-red-contrib-i2c fails to install

**URL:** <https://discourse.nodered.org/t/node-red-contrib-i2c-fails-to-install/18774>\
**Category:** General\
**Created:** [4 December 2019 05:08 UTC](https://discourse.nodered.org/t/node-red-contrib-i2c-fails-to-install/18774 "2019-12-04T05:08:51Z")\
**Posts on this page:** 1\
**Showing post:** 37

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**Author:** ![akuno](https://avatars.discourse-cdn.com/v4/letter/a/7bcc69/32.png) [@akuno](https://discourse.nodered.org/u/akuno)\
**Post date:** [14 December 2019 21:45 UTC](https://discourse.nodered.org/t/node-red-contrib-i2c-fails-to-install/18774/37 "2019-12-14T21:45:52Z")

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Thanks for the clarification, sorry to show my ignorance. Indeed I meant javascript 😃

So, let me know if my logic has left the building.

My conductivity chip is at address 100, looking at the documentation for the chip I need to send the command 'R' to address 100 to get a reading back. I cannot insert anything but numbers into the command box in the 'i2c in' node. My only guess is that this is ASCII, so an 'R' would be 082.

However when I use 'node-red-contrib-i2c' to send 082 to address 100 I get 255 returned, which is code for no data to send.

Also, most of the commands are multi-character and the input box only takes 0-255.

I think I'm missing something here, but c'est la vie

 ![082](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/5/525a4c3a7c4fad0d52d4036f77a7017857771ca1.png) ![chip readme](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/3/34ad6454542cc419c6f29f360253f9f8e27b320d.png)

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