Need help with LittleBigPlanet (Pistons)

[AdventWolf]

kitler53 said:

first create a piston and set the min/max length to whatever position you want the piston to travel to/from. As is the piston should move back and forth at whatever speed you set the piston to, keep it slow for the the moment.

next, create a two-way switch to connect to the piston and when selection the control type use "direction". when you pull the switch to one position the piston will go to it's min position and in the other direction it will go to it's max position.  speed up the piston some and you it will basically warp itself to the desired position (too slow and noobs will get themselves stuck in odd places in your level.  basically it has to move faster then someone can kill themselves.)

I forgot to specify that I was looking for an automatic way. Do you know how I could use a sensor switch or some other contraption to make it go on it's own without pulling a switch?