function ham_radio.init_hud(player)
  local name = player:get_player_name()
  ham_radio.playerhuds[name] = player:hud_add({
    hud_elem_type = "text",
    text = "",
    position = ham_radio.settings.hud_pos,
    offset = { x = ham_radio.settings.hud_offset.x, y = ham_radio.settings.hud_offset.y },
    alignment = ham_radio.settings.hud_alignment,
    number = 0xFFFFFF,
    scale= { x = 100, y = 20 },
  })
end


function ham_radio:update_hud_display(player)
  local transmitter_signal = 0

  local name = player:get_player_name()
  local item = player:get_wielded_item()

  if item:get_name() ~= "ham_radio:receiver" then
    if self.playerlocators[name] then
      player:hud_change(self.playerhuds[name], "text", "")
      self.playerlocators[name] = false
    end
    return
  end
  self.playerlocators[name] = true
  
  local meta = item:get_meta()
  local frequency = meta:get_string("frequency")

  minetest.chat_send_player(player:get_player_name(), "Configured freq:"..frequency)
  
  if frequency ~= nil and frequency ~= "" then
    local transmitter = self.read_transmitter(frequency)
    -- minetest.chat_send_player(player:get_player_name(), "Found transmitter:"..minetest.serialize(transmitter))
    if transmitter.pos then
      transmitter_signal = self:locate_transmitter(player, transmitter.pos)
    end
  end
  -- local target_pos = {x=-407, y = 59, z = 70}

    --local indicator = string.rep('|', transmitter.distance)..string.rep('|', transmitter.signal)..string.rep(':', 25-(transmitter.distance + transmitter.signal))
  local indicator = string.rep('|', transmitter_signal)..string.rep(':', 20 - transmitter_signal)

  local text = "[ Frequency: "..tostring(meta:get_string("frequency")).." ]"..indicator

  player:hud_change(self.playerhuds[name], "text", text)
end

minetest.register_on_newplayer(ham_radio.init_hud)
minetest.register_on_joinplayer(ham_radio.init_hud)

minetest.register_on_leaveplayer(function(player)
  ham_radio.playerhuds[player:get_player_name()] = nil
end)

local updatetimer = 0
minetest.register_globalstep(function(dtime)
  updatetimer = updatetimer + dtime
  if updatetimer > 0.1 then
    local players = minetest.get_connected_players()
    for i=1, #players do
      ham_radio:update_hud_display(players[i])
    end
    updatetimer = updatetimer - dtime
  end
end)