diff --git a/logic/detector.lua b/logic/detector.lua
index 937b49a..daf790c 100644
--- a/logic/detector.lua
+++ b/logic/detector.lua
@@ -3,7 +3,7 @@
 	TechAge
 	=======
 
-	Copyright (C) 2017-2022 Joachim Stolberg
+	Copyright (C) 2017-2023 Joachim Stolberg
 
 	AGPL v3
 	See LICENSE.txt for more information
@@ -21,7 +21,7 @@ local logic = techage.logic
 local BLOCKING_TIME = 8 -- seconds
 local ON_TIME = 1
 
-local WRENCH_MENU = {
+local WRENCH_MENU3 = {
 	{
 		type = "dropdown",
 		choices = "1,2,4,6,8,12,16",
@@ -47,6 +47,46 @@ local WRENCH_MENU = {
 	}
 }
 
+local WRENCH_MENU4 = {
+	{
+		type = "dropdown",
+		choices = "1,2,4,6,8,12,16",
+		name = "ontime",
+		label = S("On Time") .. " [s]",
+		tooltip = S("The time between the 'on' and 'off' commands."),
+		default = "1",
+	},
+	{
+		type = "dropdown",
+		choices = "2,4,6,8,12,16,20",
+		name = "blockingtime",
+		label = S("Blocking Time") .. " [s]",
+		tooltip = S("The time after the 'off' command\nuntil the next 'on' command is accepted."),
+		default = "8",
+	},
+	{
+		type = "number",
+		name = "countdown",
+		label = S("Countdown"),
+		tooltip = S("Counts down the number of items passed through\nand only triggers an 'on' command when it reaches zero."),
+		default = "0",
+	},
+	{
+		type = "output",
+		name = "countdown",
+		label = S("Current countdown"),
+		tooltip = S("Current countdown value."),
+		default = "0",
+	},
+	{
+		type = "items",
+		name = "config",
+		label = S("Configured Items"),
+		tooltip = S("Items which generate an 'on' command.\nIf empty, all passed items generate an 'on' command."),
+		size = 4,
+	}
+}
+
 local function switch_on(pos)
 	local mem = techage.get_mem(pos)
 	local t = minetest.get_gametime()
@@ -122,6 +162,17 @@ local function after_dig_node(pos, oldnode, oldmetadata, digger)
 	techage.del_mem(pos)
 end
 
+local function ta_after_formspec(pos, fields, playername)
+	if fields.save then
+		local nvm = techage.get_nvm(pos)
+		local val = M(pos):get_int("countdown") or 0
+		if val > 0 then
+			nvm.countdown = val 
+		else
+			nvm.countdown = nil
+		end
+	end
+end
 
 minetest.register_node("techage:ta3_detector_off", {
 	description = S("TA3 Detector"),
@@ -139,7 +190,7 @@ minetest.register_node("techage:ta3_detector_off", {
 	on_receive_fields = on_receive_fields,
 	techage_set_numbers = techage_set_numbers,
 	after_dig_node = after_dig_node,
-	ta3_formspec = WRENCH_MENU,
+	ta3_formspec = WRENCH_MENU3,
 
 	on_rotate = screwdriver.disallow,
 	paramtype = "light",
@@ -167,7 +218,7 @@ minetest.register_node("techage:ta3_detector_on", {
 	on_rotate = screwdriver.disallow,
 	techage_set_numbers = techage_set_numbers,
 	after_dig_node = after_dig_node,
-	ta3_formspec = WRENCH_MENU,
+	ta3_formspec = WRENCH_MENU3,
 
 	paramtype2 = "facedir",
 	groups = {choppy=2, cracky=2, crumbly=2, not_in_creative_inventory=1},
@@ -192,7 +243,8 @@ minetest.register_node("techage:ta4_detector_off", {
 	on_receive_fields = on_receive_fields,
 	techage_set_numbers = techage_set_numbers,
 	after_dig_node = after_dig_node,
-	ta3_formspec = WRENCH_MENU,
+	ta4_formspec = WRENCH_MENU4,
+	ta_after_formspec = ta_after_formspec,
 
 	on_rotate = screwdriver.disallow,
 	paramtype = "light",
@@ -220,7 +272,8 @@ minetest.register_node("techage:ta4_detector_on", {
 	on_rotate = screwdriver.disallow,
 	techage_set_numbers = techage_set_numbers,
 	after_dig_node = after_dig_node,
-	ta3_formspec = WRENCH_MENU,
+	ta4_formspec = WRENCH_MENU4,
+	ta_after_formspec = ta_after_formspec,
 
 	paramtype2 = "facedir",
 	groups = {choppy=2, cracky=2, crumbly=2, not_in_creative_inventory=1},
@@ -268,13 +321,22 @@ techage.register_node({"techage:ta4_detector_off", "techage:ta4_detector_on"}, {
 		if leftover then
 			local inv =  minetest.get_inventory({type = "node", pos = pos})
 			if not inv or inv:is_empty("cfg") or inv:contains_item("cfg", ItemStack(stack:get_name())) then
-				switch_on(pos)
 				local nvm = techage.get_nvm(pos)
-				if leftover == true then
-					nvm.counter = (nvm.counter or 0) + stack:get_count()
-				else
-					nvm.counter = (nvm.counter or 0) + stack:get_count() - leftover:get_count()
+				local num_moved = stack:get_count()
+				if leftover ~= true then
+					num_moved = num_moved - leftover:get_count()
 				end
+				
+				if nvm.countdown and nvm.countdown > 0 then
+					nvm.countdown = nvm.countdown - num_moved
+					if nvm.countdown <= 0 then
+						M(pos):set_int("countdown", 0)
+						switch_on(pos)
+					end
+				elseif nvm.countdown == nil then
+					switch_on(pos)
+				end
+				nvm.counter = (nvm.counter or 0) + num_moved
 			end
 			return leftover
 		end
@@ -286,9 +348,15 @@ techage.register_node({"techage:ta4_detector_off", "techage:ta4_detector_on"}, {
 		if topic == "count" then
 			local nvm = techage.get_nvm(pos)
 			return nvm.counter or 0
+		elseif topic == "countdown" then
+			local nvm = techage.get_nvm(pos)
+			nvm.countdown = tonumber(payload) or 0
+			M(pos):set_int("countdown", nvm.countdown)
+			return true
 		elseif topic == "reset" then
 			local nvm = techage.get_nvm(pos)
 			nvm.counter = 0
+			nvm.countdown = nil
 			return true
 		else
 			return "unsupported"
@@ -298,6 +366,12 @@ techage.register_node({"techage:ta4_detector_off", "techage:ta4_detector_on"}, {
 		if topic == 6 then  -- Detector Block Reset
 			local nvm = techage.get_nvm(pos)
 			nvm.counter = 0
+			nvm.countdown = nil
+			return 0
+		elseif topic == 5 then  -- Detector Block Countdown
+			local nvm = techage.get_nvm(pos)
+			nvm.countdown = tonumber(payload[1]) or 0
+			M(pos):set_int("countdown", nvm.countdown)
 			return 0
 		else
 			return 2
diff --git a/manuals/ta4_lua_controller_EN.md b/manuals/ta4_lua_controller_EN.md
index 11b9e71..e79460d 100644
--- a/manuals/ta4_lua_controller_EN.md
+++ b/manuals/ta4_lua_controller_EN.md
@@ -396,7 +396,8 @@ Please note, that this is not a technical distinction, only a logical.
 | "port"                          | string<br />`<color>=on/off` | Enable/disable a Distributor filter slot..<br />Example: `"yellow=on"`<br />colors: red, green, blue, yellow |
 | "config" | "\<slot> \<item list>" | Configure a Distributor filter slot, like: "red default:dirt dye:blue" |
 | "text"                           | text string  | Text to be used for the Sensor Chest menu                    |
-| "reset"                          | nil          | Reset the item counter of the TA4 Item Detector block        |
+| "reset"                          | nil          | Reset item and countdown counters of the TA4 Item Detector block |
+| "countdown" | number | Set countdown counter of the TA4 Item Detector block to the given value and<br />start countdown mode. |
 | "limit"                       | number | Configure a TA4 Pusher with the number of items that are allowed to be pushed ("flow limiter" mode)<br />limit = 0 turns off the "flow limiter" mode |
 | "limit" | number | Configure a TA4 Pump with the number of liquid units that are allowed to be pumped ("flow limiter" mode)<br />limit = 0 turns off the "flow limiter" mode |
 | "config"                         | item  string | Configure the TA4 pusher.<br />Example: `wool:blue`          |
diff --git a/power/formspecs.lua b/power/formspecs.lua
index 985901b..a982637 100644
--- a/power/formspecs.lua
+++ b/power/formspecs.lua
@@ -28,6 +28,7 @@ techage.power = {}
 -- Helper function
 -------------------------------------------------------------------------------
 local function round(val)
+	val = tonumber(val) or 0
 	if val > 100 then
 		return math.floor(val + 0.5)
 	elseif val > 10 then