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I'm interested in experimenting with custom LEGO Powered Up peripherals. Are there connectors available that I can use to interface with the hub?

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There do not appear to be any compatible connectors available currently. You can obviously splice cables from the official components, but that's expensive and makes those components unusable.

I hope that someone has a better answer, but the best that I've been able to do so far is to use a modified SATA connector. I first saw this in a video that demonstrated that the pin separation is the same between the two connectors.

Here's a standard SATA connector:

SATA connector

With a little Dremel work, you can expose the pins and reduce the width enough to fit the SATA connector into the Powered Up hub:

Exposed SATA

Here's the Powered Up connector for reference:

Powered Up connector

Notice that the SATA connector uses one extra pin. The pin on the right is extra and will not make contact with anything.

The first 6 pins line up with the hub just fine:

Hub with exposed connector

The SATA connector is unfortunately a little too thin to fit snugly:

SATA vs Hub port size

If you can get it wedged in using some sort of shim (paper, cardboard, etc) you should be able to get a good connection.

SATA plugged in

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