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NFC Tags and Wireless Charging (lemmy.world)
submitted 8 months ago by to c/homeassistant@lemmy.world
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Maybe not the correct place but I know a lot of folks use NFC tags to trigger automation.

Does anyone have experience with a tag in-between their phone and the wireless charger? I have a few wireless charging stands I'd like to set automations to (ie: "I've set my phone on the nightstand charger, X,Y,Z lights should be set to red if they're turned on now"). I'm just not sure how close the freqs both use are (and even less sure of how much interference causes issues).

So yeah, has anyone used an NFC tag in-between their phone and wireless charger without melting either?

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[–] 9 points 8 months ago (7 children)

Assuming you have the HA app installed you can just use the sensor found under Settings, Companion App, Manage Sensors, Battery Sensors, Charger type.

I'm not sure how quickly it updates but give it a try.

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  • [–] 5 points 8 months ago

    Do this.

    Whether it would fry the NFC tag or not, you want as little distance as possible between the wireless charger and phone. More distance is less efficient (more heat, more wasted power, slower charging).

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  • [–] 3 points 8 months ago (2 children)

    Agree that this is probably best, maybe combined with a time condition (if you have a regular bed time!).

    Something to note with iPhones- you can’t scan a tag for home assistant and have it auto-execute your automation. It prompts that a tag has been scanned and then asks if you want to open home assistant…at which point just make a Lovelace button to toggle your automation as you’ll have to interact with your phone! There are hacky work arounds (last time I checked) with the shortcuts app to bypass this, but at that point maybe just use the mobile app sensors!

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  • [–] 3 points 8 months ago (1 child)

    As an addition after re-reading your post requirement for multiple chargers, if you had a cheap smart plug on each charger, you could measure the current draw and use that as a condition for different automation actions (combined with the mobile app charging state sensor). That way you could identify which charger your phone was placed upon.

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