Light Switch

--Monitor side ("front", "back", "left", "right", "top" or "bottom")
local cmon = peripheral.wrap("top")

--Start on or off? (0=off, 1=on)
local state = 0
while true do
    if state==1 then
--Colour of the light ("white", "orange", "magenta", "lightBlue", "yellow", "lime", "pink", "gray", "lightGray", "cyan", "purple", "blue", "brown", "green", "red", "black")
        cmon.setBackgroundColor(colors.white)
-- Do not change anything below this line
        cmon.clear()
    else
        cmon.setBackgroundColor(colors.black)
        cmon.clear()
    end
    event, side, x,y = os.pullEvent()
    if event == "monitor_touch" then
        state = (state + 1) % 2
    end
end