sonar

local sensor = peripheral.wrap("right")
local chatbox = peripheral.wrap("left")
while true do
  local allPlayers = sensor.getNearbyPlayers(300)
  local string = "!!! INTRUDER ALERT !!! - "

  for key, var in pairs(allPlayers) do
    string = string .. var['player']
  end
  if string ~= "!!! INTRUDER ALERT !!! - " then
    chatbox.tell("shoham", string)
  end
  sleep(1)
end