# Help needed with comparing inputs using msg.topic

**URL:** <https://discourse.nodered.org/t/help-needed-with-comparing-inputs-using-msg-topic/52258>\
**Category:** General\
**Created:** [15 October 2021 10:42 UTC](https://discourse.nodered.org/t/help-needed-with-comparing-inputs-using-msg-topic/52258 "2021-10-15T10:42:32Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [16 October 2021 14:30 UTC](https://discourse.nodered.org/t/help-needed-with-comparing-inputs-using-msg-topic/52258/10 "2021-10-16T14:30:26Z")

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I don't understand what you mean. Can you post the flow for what you have so far please so that I can better understand? So from the pressure inputs through to the compressor output. See this post for how to post your flow - [How to share code or flow json](https://discourse.nodered.org/t/how-to-share-code-or-flow-json/506)

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_[View the full topic](https://discourse.nodered.org/t/help-needed-with-comparing-inputs-using-msg-topic/52258)._