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Help using sonoff r2 dual for window blinders

I'm trying to control the blinds with a r2 dual but keeping the original buttons working, I found that it's possible to solder a signal wire directly to the board (button0 and button1).

A made a schematic of how they are connected now and how I think they should work can anyone help me verify they will work? Also can I tie the ground lines or will that create problems?

any help is apreciated.

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