diff --git a/mesecons/init.lua b/mesecons/init.lua
index babfca4..40aa7d9 100644
--- a/mesecons/init.lua
+++ b/mesecons/init.lua
@@ -60,14 +60,13 @@ function mesecon:receptor_on(pos, rules)
 	end
 
 	for i, rule in ipairs(rules) do
-		local np = {}
-		np.x = pos.x + rule.x
-		np.y = pos.y + rule.y
-		np.z = pos.z + rule.z
+		local np = {
+		x = pos.x + rule.x,
+		y = pos.y + rule.y,
+		z = pos.z + rule.z}
 		if mesecon:rules_link(pos, np, rules) then
 			mesecon:turnon(np, pos)
 		end
-		i=i+1
 	end
 end
 
@@ -76,17 +75,14 @@ function mesecon:receptor_off(pos, rules)
 		rules = mesecon:get_rules("default")
 	end
 
-	local connected = false
-
 	for i, rule in ipairs(rules) do
-		local np = {}
-		np.x = pos.x + rule.x
-		np.y = pos.y + rule.y
-		np.z = pos.z + rule.z
-		if mesecon:rules_link(pos, np, rules) and mesecon:connected_to_pw_src(np) == false then
+		local np = {
+		x = pos.x + rule.x,
+		y = pos.y + rule.y,
+		z = pos.z + rule.z}
+		if mesecon:rules_link(pos, np, rules) and not mesecon:connected_to_pw_src(np) then
 			mesecon:turnoff(np, pos)
 		end
-		i=i+1
 	end
 end
 
diff --git a/mesecons/internal.lua b/mesecons/internal.lua
index 71b5172..ce43ce5 100644
--- a/mesecons/internal.lua
+++ b/mesecons/internal.lua
@@ -2,23 +2,19 @@
 
 --Receptors
 function mesecon:is_receptor_node(nodename)
-	local i = 1
 	for i, receptor in ipairs(mesecon.receptors) do
 		if receptor.onstate == nodename then
 			return true
 		end
-		i = i + 1
 	end
 	return false
 end
 
 function mesecon:is_receptor_node_off(nodename, pos, ownpos)
-	local i = 1
 	for i, receptor in ipairs(mesecon.receptors) do
 		if receptor.offstate == nodename then
 			return true
 		end
-		i = i + 1
 	end
 	return false
 end
@@ -87,7 +83,6 @@ end
 
 function mesecon:deactivate(pos)
 	local node = minetest.env:get_node(pos)	
-	local i = 1
 	for i, action in ipairs(mesecon.actions_off) do
 		action(pos, node) 
 	end
@@ -95,7 +90,6 @@ end
 
 function mesecon:changesignal(pos)
 	local node = minetest.env:get_node(pos)	
-	local i = 1
 	for i, action in ipairs(mesecon.actions_change) do
 		action(pos, node) 
 	end
@@ -189,7 +183,6 @@ end
 
 function mesecon:turnon(pos)
 	local node = minetest.env:get_node(pos)
-	local i = 1
 
 	if mesecon:is_conductor_off(node.name) then
 		local rules = mesecon:conductor_get_rules(node)
@@ -215,7 +208,6 @@ end
 
 function mesecon:turnoff(pos) --receptor rules used because output could have been dug
 	local node = minetest.env:get_node(pos)
-	local i = 1
 	local rules
 
 	if mesecon:is_conductor_on(node.name) then
@@ -246,7 +238,7 @@ function mesecon:connected_to_pw_src(pos, checked)
 	local c = 1
 	if checked == nil then checked = {} end
 	while checked[c] ~= nil do --find out if node has already been checked (to prevent from endless loop)
-		if  compare_pos(checked[c], pos) then 
+		if  compare_pos(checked[c], pos) then
 			return false, checked
 		end
 		c = c + 1
@@ -265,7 +257,6 @@ function mesecon:connected_to_pw_src(pos, checked)
 	local connected
 	local rules = mesecon:conductor_get_rules(node)
 
-	local i = 1
 	for i, rule in ipairs(rules) do
 		local np = {}
 		np.x = pos.x + rule.x
@@ -417,7 +408,6 @@ end
 
 --Rules rotation Functions:
 function mesecon:rotate_rules_right(rules)
-	local i=1
 	local nr={};
 	for i, rule in ipairs(rules) do
 		nr[i]={}
@@ -429,7 +419,6 @@ function mesecon:rotate_rules_right(rules)
 end
 
 function mesecon:rotate_rules_left(rules)
-	local i=1
 	local nr={};
 	for i, rule in ipairs(rules) do
 		nr[i]={}
@@ -441,7 +430,6 @@ function mesecon:rotate_rules_left(rules)
 end
 
 function mesecon:rotate_rules_down(rules)
-	local i=1
 	local nr={};
 	for i, rule in ipairs(rules) do
 		nr[i]={}
@@ -453,7 +441,6 @@ function mesecon:rotate_rules_down(rules)
 end
 
 function mesecon:rotate_rules_up(rules)
-	local i=1
 	local nr={};
 	for i, rule in ipairs(rules) do
 		nr[i]={}
diff --git a/mesecons_microcontroller/init.lua b/mesecons_microcontroller/init.lua
index 3a2ce2b..59269b3 100644
--- a/mesecons_microcontroller/init.lua
+++ b/mesecons_microcontroller/init.lua
@@ -72,6 +72,7 @@ minetest.register_node(nodename, {
 			"button_exit[3.5,1;2,3;program;Program]")
 		meta:set_string("infotext", "Unprogrammed Microcontroller")
 		meta:set_int("heat", 0)
+		meta:set_int("working", 0)
 		local r = ""
 		for i=1, EEPROM_SIZE+1 do r=r.."0" end --Generate a string with EEPROM_SIZE*"0"
 		meta:set_string("eeprom", r)
@@ -181,12 +182,15 @@ function yc_code_remove_commentary(code)
 end
 
 function yc_parsecode(code, pos)
+	local meta = minetest.env:get_meta(pos)
+	if meta:get_int("working") == 1 then return false end
+	meta:set_int("working", 1)
 	local endi = 1
 	local Lreal = yc_get_real_portstates(pos)
 	local Lvirtual = yc_get_virtual_portstates(pos)
 	if Lvirtual == nil then return nil end
 	local c
-	local eeprom = minetest.env:get_meta(pos):get_string("eeprom")
+	local eeprom = meta:get_string("eeprom")
 	while true do
 		command, endi = parse_get_command(code, endi)
 		if command == nil then return nil end
@@ -231,6 +235,7 @@ function yc_parsecode(code, pos)
 		minetest.env:get_meta(pos):set_string("eeprom", eeprom) end
 	end
 	yc_action(pos, Lvirtual)
+	minetest.env:get_meta(pos):set_int("working", 0)
 	return true
 end
 
@@ -569,29 +574,17 @@ end
 
 --Real I/O functions
 function yc_action(pos, L) --L-->Lvirtual
-	Lv = yc_get_virtual_portstates(pos)
-	local meta = minetest.env:get_meta(pos)
-	local code = meta:get_string("code")
-	local afterid = meta:get_int("afterid")
-	local heat = meta:get_int("heat")
-	local eeprom = meta:get_string("eeprom")
-	local infotext   = meta:get_string("infotext")
-	local formspec = meta:get_string("formspec")
+	local Lv = yc_get_virtual_portstates(pos)
+	local metatable = minetest.env:get_meta(pos):to_table()
 	local name = "mesecons_microcontroller:microcontroller"
 		..tonumber(L.d and 1 or 0)
 		..tonumber(L.c and 1 or 0)
 		..tonumber(L.b and 1 or 0)
 		..tonumber(L.a and 1 or 0)
 	minetest.env:add_node(pos, {name=name})
-	local meta = minetest.env:get_meta(pos)
-	meta:set_string("code", code)
-	meta:set_int("heat", heat)
-	meta:set_int("afterid", afterid)
-	meta:set_string("eeprom", eeprom)
-	meta:set_string("infotext", infotext)
-	meta:set_string("formspec", formspec)
+	minetest.env:get_meta(pos):from_table(metatable)
 
-	yc_action_setports(pos, L, Lv, rules)
+	yc_action_setports(pos, L, Lv)
 end
 
 function yc_action_setports(pos, L, Lv)
@@ -602,7 +595,7 @@ function yc_action_setports(pos, L, Lv)
 		if L.a == true then mesecon:receptor_on(pos, rules)
 		else mesecon:receptor_off(pos, rules) end
 	end
-	if Lv.b ~= L.b then 
+	if Lv.b ~= L.b then
 		rules = mesecon:get_rules(name.."0010")
 		if L.b == true then mesecon:receptor_on(pos, rules)
 		else mesecon:receptor_off(pos, rules) end
@@ -692,7 +685,7 @@ end
 
 function yc_overheat_off(pos)
 	rules = mesecon:get_rules("mesecons_microcontroller:microcontroller1111")
-	mesecon:receptor_off(pos, rules);
+	mesecon:receptor_off(pos, rules)
 end
 
 mesecon:register_on_signal_change(function(pos, node)