yellow.lua

green = false
function eventF()
    event, side, chan, reply, dist = os.pullEvent("modem_message")
    print("tripped event")
    green = true
end
function lights()
    rs.setOutput("right", true)
    sleep(1)
    rs.setOutput("right", false)
    rs.setOutput("left", true)
    sleep(1)
    rs.setOutput("left", false)
end
rs.setOutput("bottom", false)
while not green do
    parallel.waitForAny(eventF, lights)
end
rs.setOutput("right", false)
rs.setOutput("left", false)
rs.setOutput("bottom", true)