Turboclonerider

I am trying to make a program that will output a redstone signal to a light grey cable (from project red) so i can get enhanced portals 3 to activate a portal, but i can't get the redstone to work and i prefer using the computer. (uploading screenshots wouldn't work)

error:

/home/initialization:4: attempt to index field 'redstone' (a nil value):

stack traceback:

            /home/initialization:4: in main chunk

            [C]: in function 'xpcall'

            machine:751: in function 'xpcall'

             /lib/process.lua:78: in function </lib/process.lua:71>

stack traceback:

             [C]: in function 'error'

             /lib/process.lua:92: in function </libprocess.lua:71>

the code:

local component = require ("component")

local component = require ("sides")

component.redstone.setOutput(sides.back, colors.lightGrey, 16)

print("Event Initialized")

Also, is there a way to make the text bigger?

My program is for a rail tour system, basically i have it where the redstone will activate or deactivate from one computer, but i wanted a second one to display either activated or deactivated.