local cable_side = "back"
local cable_color = colors.black

function RunStuff()
    side = "top"
        text = "Welcome to Jonas mansion!"
    mon = peripheral.wrap(side)
    mon.setTextScale(2)
    mon.setCursorPos(4,5)
    mon.write(text)
end

function ListenRedstone()
    while true end
        local state = colors.test( redstone.getBundledInput( cable_side ), cable_color )

        if ( state ) then
            RunStuff()
        end

        sleep( 0.2 )
    end
end

ListenRedstone()