elevator

up = true
rednet.open("left")
function activate()
    if up then
        for i=1,17 do
            redstone.setOutput("right",true)
            os.sleep(0.5)
            redstone.setOutput("right",false)
            os.sleep(0.25)
        end
        up = false
    else
        for i=1,17 do
            redstone.setOutput("bottom",true)
            os.sleep(0.5)
            redstone.setOutput("bottom",false)
            os.sleep(0.25)
        end
        up = true
    end
end

while true do
    event, id, message = os.pullEvent()
    if event == "rednet_message" and message == "elevatoractivate" then
        activate()
        print("Activated.")
    end
end