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#1  

Just hook them to the Analog Port. Parallax also sells some, I don't know how much. But , these will work fine. It will give you a voltage reading between 0 and 5 volts. D.J. would have to tell you but I guess they would also work on the digital port for a True/False reading. But, you would probably have to write a little code for them. They will keep you on line, or keep you from falling down the stairs.

P.S. my humble 2Cents. Verify with D.J. before you act.

Mel