test

local timer = 0.5
local sensor = peripheral.find("openperipheral_sensor")
local rsSide = "back"

if sensor == nil then
 error("no sensor found")
end

function loop()
  local dragon = false
  local mobs = sensor.getMobIds()

  --for _,id in pairs(mobs) do
  --  local mob = sensor.getMobData(id)

  --  local name = mob.basic().name

  --  if name == "Ender Dragon" then
  --    dragon = true
  --  end
  --end

  if #mobs > 0 then
    print("Dragon detected")
    rs.setOutput(rsSide, true)
  else
    print("No Dragon found")
    rs.setOutput(rsSide, false)
  end
end



os.queueEvent("timer")
local run = true
while run do
  local ev, p1, p2, p3 = os.pullEvent()

  if ev == "timer" then
    loop()
    os.startTimer(timer)
  end

  if ev == "char" and p1 == "t" then
    run = false
  end

end