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That's a pretty decent idea for a project, but I would have instead hooked into the buzzer signal.

The author over-complicated his solution, but that doesn't make it invalid.

My landlord wouldn't love me very much if I started taking apart my dryer to hook a mysterious wired object to the buzzer...

i thought the same thing until i read the actual instructions:

it uses an accelerometer to detect the motion of the washer. no need to dissect your large home applicances!