signal = 0
rainbowColours = {
  15,
  7,
  10,
  11,
  9,
  3,
  5,
  4,
  14,
}

while true do
  for i = 1, #rainbowColours do
    signal = rainbowColours[i]
    print(signal)
    sleep(1)
    rs.setAnalogOutput("left", signal)
    rs.setAnalogOutput("back", signal)
  end
end