minetest.register_abm({
   label = 'Hoppers',
   nodenames = {'hopper:hopper', 'hopper:hopper_side'},
   interval = 30,
   chance = 1,
   action = function(pos)
      local timer1 = minetest.get_node_timer(pos)
      if not timer1:is_started() then
         timer1:start(1.0)
      end
   end,
})
