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The EcHo has three I/O ports. What are they for?

Most people opt to use two I/O ports for controlling the projector screen – one for roll-down and one for roll-up. With the third I/O port, you are able to connect a PIR motion sensor, which is brilliant for designing eco-friendly installations. 

You can make the PIR turn off your installation when no motion is detected and remember to time the system so that it does not turn off too soon.

What you could also use your I/O for is a keyboard lock, which prevents unwanted handling of the control panel.

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