There are many ways to do it. eg read value then an "if" to change something if it changes or a "while" to do nothing until it changes etc.
You could also be a bit more specific as to what you want to do... 
Mowcius
There are many ways to do it. eg read value then an "if" to change something if it changes or a "while" to do nothing until it changes etc.
You could also be a bit more specific as to what you want to do...
Mowcius