While Rhn gave the best advice, advice you should follow.
There's a vanilla method of sending a signal up. Place a redstone torch on top of a block and above that do the same. The one on top should be off, when the bottom torch changes so should the rest.
Problem with this method is it's using a tower of Not gates. Depending on the height you might not get the signal you want at the top and it could make your build look odd.
It's why people just use ProjectRed and all the other redstone cable options.
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