Pasted

rednet.open("top")
while true do
    local id,msg = rednet.receive()
    if msg == "water" then
        local id2,msg2 = rednet.receive(3)
        if msg2 == nil then
        else
            if msg2 == 1 then
                redstone.setAnalogOutput("right",15)
            elseif msg2 == 2 then
                redstone.setAnalogOutput("right",0)
            end
        end
    end
end