rednet redstone sender

local receivers = {36, 37, 38, 39, 40}

local function send(msg)
  for i = 1, #receivers do
    rednet.send(receivers[i], msg)
  end
end

rednet.open("top")
while true do
  local state = rs.getInput("back")
  print("Redstone state change detected. new state: ", state)
  if state then
    send("off")
  else
    send("on")
  end
  os.pullEvent("redstone")
end