I'm wondering how many motors I can control at the same time using the LEGO Powered Up system? What components are required to make this work?

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With current hardware, the answer is 10. From the trains FAQ:

You can run up to 10 trains at the same time from one remote control. There are 5 channels on the remote control (you can tell them apart by their different colors), and with each channel you can control 2 Smarthubs in separate trains with motors plugged in – as long as on one train the motor is in port A of the Smarthub, and on the other train, port B.

Each Smarthub provides two ports:


There are 5 channels available on current remotes, so you can pair up to 5 remotes with Smarthubs and control 5×2=10 outputs at the same time.

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