[mcp3204] diff mode update

[markodraca]

Added documentation for diff mode analog readings on a MCP3204/MCP3208.

Description:

This PR adds documentation for the new differential mode feature for the MCP3204/MCP3208 ADC components. Differential mode allows the chip to measure the voltage difference between two analog input pins, rather than measuring a single pin's voltage relative to ground. This is useful for applications requiring precise measurements of small voltage differences, noise rejection in sensor readings.

Pull request in esphome with YAML changes (if applicable):

• [mcp3204] differential mode support esphome#7436

Checklist:

• I am merging into next because this is new documentation that has a matching pull-request in esphome as linked above.
  or

• I am merging into current because this is a fix, change and/or adjustment in the current documentation and is not for a new component or feature.

• Link added in /components/index.rst when creating new documents for new components or cookbook.

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[swoboda1337]

This needs to use the next branch

Developer docs are here: https://developers.esphome.io/contributing/docs/

[esphome]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[swoboda1337]

I fixed the branch but none of the files are changed

[markodraca]

Thanks. My first PR here and its quite confusing. Do I need to do anything else for this diff mode?

…

On Fri, Nov 14, 2025, 16:35 Jonathan Swoboda ***@***.***> wrote: *swoboda1337* left a comment (esphome/esphome-docs#5623) <#5623 (comment)> I fixed the branch — Reply to this email directly, view it on GitHub <#5623 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAJE6M225DU4DH77FFGB6T34XZCJAVCNFSM6AAAAACMCZ6N66VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTKMZTGMZDKNJUG4> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[swoboda1337]

Thanks. My first PR here and its quite confusing. Do I need to do anything else for this diff mode?

Well if you look at the changed files there are none? So yeah you have to add the docs still :)

[markodraca]

I also need to figure out, when in diff mode, how to report an error if pin = 2. Well, I can promise this in another two to three years, you can count on it :). Thanks again.

…

On Fri, Nov 14, 2025, 16:59 Jonathan Swoboda ***@***.***> wrote: *swoboda1337* left a comment (esphome/esphome-docs#5623) <#5623 (comment)> Thanks. My first PR here and its quite confusing. Do I need to do anything else for this diff mode? Well if you look at the changed files there are none? So yeah you have to add the docs still :) image.png (view on web) <https://github.com/user-attachments/assets/4cbde77e-8c66-4433-af55-2a5122d133cf> — Reply to this email directly, view it on GitHub <#5623 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAJE6O4RVYEPJESEIFCC3T34X36DAVCNFSM6AAAAACMCZ6N66VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTKMZTGQZTIOJUHE> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[swoboda1337]

There are no changes to review

[markodraca]

Moved to PR #5634