diff --git a/logic/command_converter.lua b/logic/command_converter.lua
new file mode 100644
index 0000000..6e5acea
--- /dev/null
+++ b/logic/command_converter.lua
@@ -0,0 +1,183 @@
+--[[
+
+	TechAge
+	=======
+
+	Copyright (C) 2017-2023 Joachim Stolberg
+
+	AGPL v3
+	See LICENSE.txt for more information
+
+	TA3 Commannd Converter
+
+]]--
+
+-- for lazy programmers
+local M = minetest.get_meta
+local S = techage.S
+local DESCR = S("TA3 Command Converter")
+
+local logic = techage.logic
+
+local sDelay = "0,1,2,3,4,5,7,10,15,20,30,45,60"
+
+local function switch_on(pos)
+	logic.swap_node(pos, "techage:ta3_command_converter_on")
+	logic.send_cmnd(pos, "command_on", "")
+end
+
+local function switch_off(pos)
+	logic.swap_node(pos, "techage:ta3_command_converter_off")
+	logic.send_cmnd(pos, "command_off", "")
+end
+
+local function formspec(meta)
+	local numbers = meta:get_string("numbers") or ""
+	local command_on = meta:get_string("command_on")
+	local command_off = meta:get_string("command_off")
+	local delay_on = techage.dropdown_index(sDelay, meta:get_string("delay_on"))
+	local delay_off = techage.dropdown_index(sDelay, meta:get_string("delay_off"))
+
+	return "formspec_version[4]size[10,6]"..
+	"box[0.2,0.2;9.6,0.6;#c6e8ff]" ..
+		"label[0.4,0.5;" .. minetest.colorize( "#000000", DESCR) .. "]" ..
+
+		"field[1.0,1.5;8,0.6;numbers;" .. S("Insert destination node number(s)") .. ";" .. numbers .. "]" ..
+
+		"label[0.6,2.7;" .. S("Receive") .. "]" ..
+		"label[2.8,2.7;" .. S("Sent command") .. "]" ..
+		"label[7.34,2.7;" .. S("Send delay (s)") .. "]" ..
+
+		"box[0.5,3.1;1.2,0.6;#888]" ..
+		"label[0.6,3.4;on]" ..
+		"field[2.7,3.1;3.5,0.6;command_on;;" .. command_on .. "]" ..
+		"dropdown[7.2,3.1;2,0.6;delay_on;" .. sDelay .. ";" .. delay_on .. ";false]" ..
+
+		"box[0.5,4.0;1.2,0.6;#888]" ..
+		"label[0.6,4.3;off]" ..
+		"field[2.7,4.0;3.5,0.6;command_off;;" .. command_off .. "]" ..
+		"dropdown[7.2,4.0;2,0.6;delay_off;" .. sDelay .. ";" .. delay_off .. ";false]" ..
+
+		"button_exit[3.5,5.2;3,0.6;exit;" .. S("Save") .. "]"
+end
+
+local function techage_set_numbers(pos, numbers, player_name)
+	local meta = M(pos)
+	local res = logic.set_numbers(pos, numbers, player_name, DESCR)
+	meta:set_string("formspec", formspec(meta))
+	return true --res
+end
+
+local function after_dig_node(pos, oldnode, oldmetadata, digger)
+	techage.remove_node(pos, oldnode, oldmetadata)
+	techage.del_mem(pos)
+end
+
+local function on_receive_fields(pos, formname, fields, player)
+	if minetest.is_protected(pos, player:get_player_name()) then
+		return
+	end
+
+	print(dump(fields))
+	local meta = minetest.get_meta(pos)
+	if fields.exit and fields.exit ~= "" then
+		if techage.check_numbers(fields.numbers, player:get_player_name()) then
+			meta:set_string("numbers", fields.numbers)
+			logic.infotext(M(pos), DESCR)
+		end
+		meta:set_string("command_on", fields.command_on)
+		meta:set_string("command_off", fields.command_off)
+		meta:set_int("delay_on", fields.delay_on or 0)
+		meta:set_int("delay_off", fields.delay_off or 0)
+		meta:set_string("formspec", formspec(meta))
+	elseif fields.exit == "close" then
+		meta:set_string("formspec", formspec(meta))
+	end
+end
+
+minetest.register_node("techage:ta3_command_converter_off", {
+	description = DESCR,
+	tiles = {
+		-- up, down, right, left, back, front
+		"techage_filling_ta3.png^techage_frame_ta3_top.png",
+		"techage_filling_ta3.png^techage_frame_ta3_top.png",
+		"techage_filling_ta3.png^techage_frame_ta3.png^techage_appl_command_converter.png",
+	},
+	after_place_node = function(pos, placer)
+		local meta = M(pos)
+		logic.after_place_node(pos, placer, "techage:ta3_command_converter_off", DESCR)
+		logic.infotext(meta, DESCR)
+		meta:set_string("formspec", formspec(meta))
+	end,
+
+	on_timer = function (pos, elapsed)
+		switch_on(pos)
+	end,
+
+	on_receive_fields = on_receive_fields,
+	techage_set_numbers = techage_set_numbers,
+	after_dig_node = after_dig_node,
+	paramtype2 = "facedir",
+	groups = {choppy=2, cracky=2, crumbly=2},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+})
+
+minetest.register_node("techage:ta3_command_converter_on", {
+	description = DESCR,
+	tiles = {
+		-- up, down, right, left, back, front
+		"techage_filling_ta3.png^techage_frame_ta3_top.png",
+		"techage_filling_ta3.png^techage_frame_ta3_top.png",
+		"techage_filling_ta3.png^techage_frame_ta3.png^techage_appl_command_converter_on.png",
+	},
+
+	on_timer = function (pos, elapsed)
+		switch_off(pos)
+	end,
+
+	on_receive_fields = on_receive_fields,
+	techage_set_numbers = techage_set_numbers,
+	after_dig_node = after_dig_node,
+	paramtype2 = "facedir",
+	groups = {choppy=2, cracky=2, crumbly=2, not_in_creative_inventory=1},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+	drop = "techage:ta3_playerdetector_off"
+})
+
+minetest.register_craft({
+	output = "techage:ta3_command_converter_off",
+	recipe = {
+		{"", "group:wood", "default:mese_crystal"},
+		{"default:mese_crystal_fragment", "default:copper_ingot", "techage:vacuum_tube"},
+		{"", "group:wood", ""},
+	},
+})
+
+techage.register_node({
+		"techage:ta3_command_converter_off", "techage:ta3_command_converter_on"
+	}, {
+		on_recv_message = function(pos, src, topic, payload)
+			if topic == "on" then
+				local delay = M(pos):get_int("delay_on") or 0
+				if delay > 0 then
+					minetest.get_node_timer(pos):start(delay)
+				else
+					switch_on(pos)
+				end
+				return true
+			elseif topic == "off" then
+				local delay = M(pos):get_int("delay_off") or 0
+				if delay > 0 then
+					minetest.get_node_timer(pos):start(delay)
+				else
+					switch_off(pos)
+				end
+				return true
+			else
+				return "unsupported"
+			end
+		end,
+	}
+)
\ No newline at end of file
diff --git a/logic/gaze_sensor.lua b/logic/gaze_sensor.lua
new file mode 100644
index 0000000..6ae47ab
--- /dev/null
+++ b/logic/gaze_sensor.lua
@@ -0,0 +1,221 @@
+--[[
+
+	TechAge
+	=======
+
+	Copyright (C) 2017-2023 Joachim Stolberg
+
+	AGPL v3
+	See LICENSE.txt for more information
+
+	TA4 Gaze Sensor
+
+]]--
+
+-- for lazy programmers
+local M = minetest.get_meta
+local S = techage.S
+
+local logic = techage.logic
+local CYCLE_TIME = 2
+local DESCR = S("TA4 Gaze Sensor")
+local MAX_PLAYER_DIST = 30
+
+local WRENCH_MENU = {
+	{
+		type = "ascii",
+		name = "names",
+		label = S("Player Names"),
+		tooltip = S("Input the player name(s) separated by blanks.\nIf empty, only the owner is accepted."),
+		default = "",
+	},
+	{
+		type = "numbers",
+		name = "numbers",
+		label = S("Number"),
+		tooltip = S("Destination block number(s)"),
+		default = "",
+		check = techage.check_numbers,
+	},
+	{
+		type = "ascii",
+		name = "command1",
+		label = "On " .. S("Command"),
+		tooltip = S("Command to send when sensor is viewed"),
+		default = "on",
+	},
+	{
+		type = "ascii",
+		name = "command2",
+		label = "Off " .. S("Command"),
+		tooltip = S("Command to send when sensor is no longer viewed"),
+		default = "off",
+	},
+}
+
+local function switch_on(pos)
+	if logic.swap_node(pos, "techage:ta4_gaze_sensor_on") then
+		logic.send_cmnd(pos, "command1", "on")
+	end
+end
+
+local function switch_off(pos)
+	if logic.swap_node(pos, "techage:ta4_gaze_sensor_off") then
+		logic.send_cmnd(pos, "command2", "off")
+	end
+end
+
+local function get_players(pos)
+	local meta = minetest.get_meta(pos)
+	local names = meta:get_string("names") or ""
+	local t = string.split(names, " ") or {}
+	t[#t + 1] = meta:get_string("owner")
+	return t
+end
+
+local function player_focuses_block(pos, name)
+	local obj = minetest.get_player_by_name(name)
+	if obj then
+		local owner_pos = obj:get_pos()
+		owner_pos.y = owner_pos.y + 1.5
+		local dist = vector.distance(pos, owner_pos)
+		if dist < MAX_PLAYER_DIST then
+			local dir = obj:get_look_dir()
+			local vec1 = vector.multiply(dir, dist)
+			local pos1 = vector.round(vector.add(owner_pos, vec1))
+			if vector.equals(pos, pos1) then
+				return true
+			end
+		end
+	end
+	return false
+end
+
+local function scan_for_player(pos)
+	local mem = techage.get_mem(pos)
+	mem.players = mem.players or get_players(pos)
+	for _, name in ipairs(mem.players) do
+		if player_focuses_block(pos, name) then
+			mem.player_name = name
+			return true
+		end
+	end
+	mem.player_name = ""
+	return false
+end
+
+minetest.register_node("techage:ta4_gaze_sensor_off", {
+	description = DESCR,
+	tiles = {
+		-- up, down, right, left, back, front
+		"techage_filling_ta4.png^techage_frame_ta4_top.png",
+		"techage_filling_ta4.png^techage_frame_ta4_top.png",
+		"techage_filling_ta4.png^techage_frame_ta4_top.png^techage_appl_gaze_sensor.png",
+	},
+	after_place_node = function(pos, placer)
+		local meta = M(pos)
+		logic.after_place_node(pos, placer, "techage:ta4_gaze_sensor_off", DESCR)
+		logic.infotext(meta, DESCR)
+		minetest.get_node_timer(pos):start(CYCLE_TIME)
+	end,
+
+	on_timer = function (pos, elapsed)
+		if scan_for_player(pos) then
+			switch_on(pos)
+		end
+		return true
+	end,
+
+	techage_set_numbers = function(pos, numbers, player_name)
+		return logic.set_numbers(pos, numbers, player_name, DESCR)
+	end,
+
+	after_dig_node = function(pos, oldnode, oldmetadata, digger)
+		techage.remove_node(pos, oldnode, oldmetadata)
+		techage.del_mem(pos)
+	end,
+
+	ta4_formspec = WRENCH_MENU,
+	groups = {choppy=2, cracky=2, crumbly=2},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+})
+
+minetest.register_node("techage:ta4_gaze_sensor_on", {
+	description = DESCR,
+	tiles = {
+		-- up, down, right, left, back, front
+		"techage_filling_ta4.png^techage_frame_ta4_top.png",
+		"techage_filling_ta4.png^techage_frame_ta4_top.png",
+		"techage_filling_ta4.png^techage_frame_ta4_top.png^techage_appl_gaze_sensor_on.png",
+	},
+
+	on_timer = function (pos, elapsed)
+		if not scan_for_player(pos) then
+			switch_off(pos)
+		end
+		return true
+	end,
+
+	techage_set_numbers = function(pos, numbers, player_name)
+		return logic.set_numbers(pos, numbers, player_name, DESCR)
+	end,
+
+	after_dig_node = function(pos, oldnode, oldmetadata, digger)
+		techage.remove_node(pos, oldnode, oldmetadata)
+		techage.del_mem(pos)
+	end,
+
+	ta4_formspec = WRENCH_MENU,
+	groups = {choppy=2, cracky=2, crumbly=2, not_in_creative_inventory=1},
+	is_ground_content = false,
+	sounds = default.node_sound_wood_defaults(),
+	drop = "techage:ta4_gaze_sensor_off"
+})
+
+minetest.register_craft({
+	output = "techage:ta4_gaze_sensor_off",
+	recipe = {
+		{"dye:blue", "techage:aluminum", "dye:blue"},
+		{"default:copper_ingot", "techage:ta4_wlanchip", "default:wood"},
+	},
+})
+
+techage.register_node({
+		"techage:ta4_gaze_sensor_off", "techage:ta4_gaze_sensor_on",
+	}, {
+		on_recv_message = function(pos, src, topic, payload)
+			if topic == "name" then
+				local mem = techage.get_mem(pos)
+				return mem.player_name or ""
+			elseif topic == "state" then
+				local node = techage.get_node_lvm(pos)
+				if node.name == "techage:ta4_gaze_sensor_on" then
+					return "on"
+				else
+					return "off"
+				end
+			else
+				return "unsupported"
+			end
+		end,
+		on_beduino_request_data = function(pos, src, topic, payload)
+			if topic == 144 then  -- Player Name
+				local mem = techage.get_mem(pos)
+				return 0, mem.player_name or ""
+			elseif topic == 142 then  -- Binary State
+				local node = techage.get_node_lvm(pos)
+				if node.name == "techage:ta4_gaze_sensor_on" then
+					return 0, {1}
+				else
+					return 0, {0}
+				end
+			else
+				return 2, ""
+			end
+		end,
+		on_node_load = function(pos)
+			minetest.get_node_timer(pos):start(CYCLE_TIME)
+		end,
+	}
+)
diff --git a/textures/techage_appl_command_converter.png b/textures/techage_appl_command_converter.png
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diff --git a/textures/techage_appl_gaze_sensor.png b/textures/techage_appl_gaze_sensor.png
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diff --git a/textures/techage_appl_gaze_sensor_on.png b/textures/techage_appl_gaze_sensor_on.png
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