Sender2

while true do
 print("t para roca, y para arena")
 local event, key = os.pullEvent("char")
  if key == "t" then
  print("roca")
  peripheral.call("back", "transmit", 3, 1, "2200")
  end
  if key == "y" then
  print("arena")
  peripheral.call("back", "transmit", 3, 1, "0")
  end
end