combatibility with Carbone (and presumably other games that use older versions of the default mod)

init.lua

@@ -9,7 +9,7 @@ dofile( minetest.get_modpath( "digtron" ) .. "/node_controllers.lua" ) -- contro
 
 dofile( minetest.get_modpath( "digtron" ) .."/recipes.lua" )
 
-digtron.cycle_time = 1.0 -- How long a digtron waits between cycles.
+digtron.cycle_time = 1 -- How many seconds a digtron waits between cycles. Auto-controllers can make this wait longer, but cannot make it shorter.
 digtron.traction_factor = 3.0 -- How many digtron nodes can be moved for each adjacent solid node that the digtron has traction against
 
 -- fuel costs. For comparison, in the default game:

node_builders.lua

@@ -5,7 +5,7 @@ minetest.register_node("digtron:builder", {
 	description = "Builder Unit",
 	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 4},
 	drop = "digtron:builder",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype2= "facedir",
 	tiles = {
 		"digtron_plate.png^[transformR90",

node_controllers.lua

@@ -238,7 +238,7 @@ minetest.register_node("digtron:controller", {
 	description = "Digtron Control Unit",
 	groups = {cracky = 3, oddly_breakable_by_hand = 3, digtron = 1},
 	drop = "digtron:controller",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype2= "facedir",
 	-- Aims in the +Z direction by default
 	tiles = {
@@ -328,7 +328,7 @@ digtron.auto_cycle = function(pos)
 	meta:set_string("infotext", status)
 	
 	if cycle > 0 then
-		minetest.after(math.max(digtron.cycle_time, meta:get_int("period")), digtron.auto_cycle, newpos)
+		minetest.after(meta:get_int("period"), digtron.auto_cycle, newpos)
 	else
 		meta:set_string("formspec", auto_formspec)
 	end
@@ -339,7 +339,7 @@ minetest.register_node("digtron:auto_controller", {
 	description = "Digtron Automatic Control Unit",
 	groups = {cracky = 3, oddly_breakable_by_hand = 3, digtron = 1},
 	drop = "digtron:auto_controller",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype2= "facedir",
 	-- Aims in the +Z direction by default
 	tiles = {
@@ -364,7 +364,7 @@ minetest.register_node("digtron:auto_controller", {
 		meta:set_string("infotext", "Heat remaining in controller furnace: 0")
 		meta:set_string("formspec", auto_formspec)
 		-- Reusing offset and period to keep the digtron node-moving code simple, and the names still fit well
-		meta:set_int("period", 1)
+		meta:set_int("period", digtron.cycle_time)
 		meta:set_int("offset", 0)
 	end,
 
@@ -374,7 +374,7 @@ minetest.register_node("digtron:auto_controller", {
 		local period = tonumber(fields.period)
 		
 		if period and period > 0 then
-			meta:set_int("period", math.floor(period))
+			meta:set_int("period", math.max(digtron.cycle_time, math.floor(period)))
 		end
 		
 		if offset and offset >= 0 then
@@ -406,7 +406,7 @@ minetest.register_node("digtron:pusher", {
 	description = "Digtron Pusher Unit",
 	groups = {cracky = 3, oddly_breakable_by_hand=3, digtron = 1},
 	drop = "digtron:pusher",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype2= "facedir",
 	-- Aims in the +Z direction by default
 	tiles = {

node_diggers.lua

@@ -44,7 +44,7 @@ minetest.register_node("digtron:digger", {
 	description = "Digger Head",
 	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 3},
 	drop = "digtron:digger",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype = "light",
 	paramtype2= "facedir",
 	
@@ -90,7 +90,7 @@ minetest.register_node("digtron:intermittent_digger", {
 	description = "Intermittent Digger Head",
 	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 3},
 	drop = "digtron:intermittent_digger",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype = "light",
 	paramtype2= "facedir",
 	
@@ -145,7 +145,7 @@ minetest.register_node("digtron:soft_digger", {
 	description = "Soft Material Digger Head",
 	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 3},
 	drop = "digtron:soft_digger",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype = "light",
 	paramtype2= "facedir",
 	
@@ -198,7 +198,7 @@ minetest.register_node("digtron:intermittent_soft_digger", {
 	description = "Intermittent Soft Material Digger Head",
 	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 3},
 	drop = "digtron:intermittent_soft_digger",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype = "light",
 	paramtype2= "facedir",
 	

node_misc.lua

@@ -5,7 +5,7 @@ minetest.register_node("digtron:structure", {
 	drop = "digtron:structure",
 	tiles = {"digtron_plate.png"},
 	drawtype = "nodebox",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	climbable = true,
 	walkable = false,
 	paramtype = "light",
@@ -54,7 +54,7 @@ minetest.register_node("digtron:inventory",
 	description = "Digtron Inventory Hopper",
 	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 2},
 	drop = "digtron:inventory",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype2= "facedir",
 	tiles = {"digtron_inventory.png"},
 
@@ -91,7 +91,7 @@ minetest.register_node("digtron:fuelstore",
 	description = "Digtron Fuel Hopper",
 	groups = {cracky = 3,  oddly_breakable_by_hand=3, digtron = 5},
 	drop = "digtron:fuelstore",
-	sounds = default.node_sound_metal_defaults(),
+	sounds = digtron.metal_sounds,
 	paramtype2= "facedir",
 	tiles = {"digtron_fuelstore.png"},
 

util.lua

@@ -4,6 +4,14 @@ digtron = {}
 
 dofile( minetest.get_modpath( "digtron" ) .. "/util_item_place_node.lua" ) -- separated out to avoid potential for license complexity
 
+-- Apparently node_sound_metal_defaults is a newer thing, I ran into games using an older version of the default mod without it.
+if default.node_sound_metal_defaults ~= nil then
+	digtron.metal_sounds = default.node_sound_metal_defaults()
+else
+	digtron.metal_sounds = default.node_sound_stone_defaults()
+end
+
+
 digtron.find_new_pos = function(pos, facing)
 	-- finds the point one node "forward", based on facing
 	local dir = minetest.facedir_to_dir(facing)