this post was submitted on 17 Oct 2025
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How do I run power to a USB-C powered sensor? (lemmy.nz)
submitted 1 week ago* (last edited 1 week ago) by Dave@lemmy.nz to c/homeassistant@lemmy.world
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I'm just bought an Airgradient air quality sensor (actually two, an indoor and an outdoor).

I want to mount the outdoor one but it needs a USB-C power supply. I can run a cable but power isn't exactly close. Do I somehow find a 10m USB-C cable and run it through the roof to the sensor that I mount on the side of the house? What's a normal way of getting USB-C power to an area far away from the closest power point?

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[–] viking@infosec.pub 2 points 1 week ago* (last edited 1 week ago) (1 children)

I have a 15m long USB-C cable that's just about sufficient to power a surveillance camera, but due to the length it only delivers 0.1-0.15A. Depending on the needs that might just be enough though.

Edit: Measured with Ampere (Android app), I simply plugged my phone in to test.

[–] Dave@lemmy.nz 2 points 1 week ago (1 children)

I wasn't able to find peak power draw info but it says it should be plugged into a 2A 5V USB plug. I'm surprised how much your power drops over the length. Maybe the POE solution would be better.

[–] viking@infosec.pub 2 points 1 week ago (1 children)

I really doubt the device really needs 2A, that sounds more like the definition of a generic phone charger than functional requirement. But yeah POE or simply a regular extension cord where you plug in a short cable at the end would be a safe bet.

[–] Dave@lemmy.nz 1 points 1 week ago

I've bit the bullet and ordered a POE to USB adapter, which seems like the best plan. I'd rather that then running another 240v cable through the roof anyway.