Monitor Battery and Output to monitor Minecraft

monitor = peripheral.wrap("top")

monitor.setCursorPos(1, 1)
monitor.clear()
monX, monY = monitor.getSize()
monitor.setTextScale(0.5)
monitor.setTextColor(43)
monitor.setCursorBlink(true)
monitor.write("Starting...")
monitor.setCursorPos(1, 2)
rednet.open("right")

function write(msg)
  curX, curY = monitor.getCursorPos()
  monitor.write(msg)
  if curY == monY then
      monitor.scroll(1)
      monitor.setCursorPos(1, monY)
  else
      monitor.setCursorPos(1, curY + 1)
  end
end

function displayBattery()
  while true do
    senderId, message, protocol = rednet.receive("battery")
    if protocol == "battery" then
      write(message)
    end
  end
end

displayBattery()