# Access to charging status pin of BQ2421 on Notecarrier AF

**URL:** https://discuss.blues.com/t/access-to-charging-status-pin-of-bq2421-on-notecarrier-af/555
**Category:** Uncategorized
**Created:** [December 16, 2021, 12:40pm UTC](https://discuss.blues.com/t/access-to-charging-status-pin-of-bq2421-on-notecarrier-af/555 "2021-12-16T12:40:12Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![ssozonoff](https://avatars.discourse-cdn.com/v4/letter/s/e9c0ed/32.png) [@ssozonoff](https://discuss.blues.com/u/ssozonoff)
#### Post date: [December 16, 2021, 12:40pm UTC](https://discuss.blues.com/t/access-to-charging-status-pin-of-bq2421-on-notecarrier-af/555/1 "2021-12-16T12:40:12Z")

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Hi,

I noticed that the charge status pin (CHG) of the BBQ2421 on the Notecarrier AF is routed to the Notecard connector via NC38. Is there anyway we can gain access to the status of this pin via the Notecard API for example ? If no, what is the purpose of this connection ?

 ![Screenshot 2021-12-16 at 13.33.41](https://us1.discourse-cdn.com/flex020/uploads/blues/original/1X/788e4dffa265f7a9da8d3e52c9a3cb2e8c1b0acf.jpeg)

 ![Screenshot 2021-12-16 at 13.35.40](https://us1.discourse-cdn.com/flex020/uploads/blues/original/1X/9e09c20f0646235c4bc173668aaa486f9312437c.jpeg)

Kind Thanks,  
Serge

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### Author: ![ssozonoff](https://avatars.discourse-cdn.com/v4/letter/s/e9c0ed/32.png) [@ssozonoff](https://discuss.blues.com/u/ssozonoff)
#### Post date: [December 30, 2021, 4:09pm UTC](https://discuss.blues.com/t/access-to-charging-status-pin-of-bq2421-on-notecarrier-af/555/2 "2021-12-30T16:09:57Z")

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Bump. 🙂 Would be useful to get an answer on this one.

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### Author: ![RobLauer](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/roblauer/32/1567_2.png) [@RobLauer](https://discuss.blues.com/u/RobLauer)
#### Post date: [December 30, 2021, 11:23pm UTC](https://discuss.blues.com/t/access-to-charging-status-pin-of-bq2421-on-notecarrier-af/555/3 "2021-12-30T23:23:00Z")

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Hi @ssozonoff,

Sorry for the delay in our reply. There is a `card.carrier` API you can use (not yet documented, but will be soon). For example, `{"req":"card.carrier","mode":"charging"}` tells the Notecard that AUX5 is connected to a Notecarrier that supports charge detection on AUX5, using open-drain.

Once that is set, `{"charging":true}` will appear in the response if the Notecarrier is currently indicating that charging is in progress.

To revert the charging detection, use `{"req":"card.carrier","mode":"-"}`.