The code you have listed for the sensors is completely wrong. Please go copy and past the code you supply and try to run it, it will not work.
The code you supply is not compatible with the linker shield even though it says it is. IE how you run the LED shield and Button shield when pin 23/24
are on the same port??!?
The slider is not even accurate and feels like it will break after 5 uses.
There is no code to get the light sensor to work correctly.
Lastly you can't reply to emails when you ask what my problem is. It is just silence.
Not a good way to run a company!