View difference between Paste ID: 8VhRA26t and b6TZWTLi

 -- Version A3
 
 os.pullEvent = coroutine.yield
-while true do
+
-    local r = math.random()
+
-    local col = nil
+local systems = peripheral.wrap "top"
 local sign = peripheral.wrap "front"
-    if wasCol == colors.red then
+
-        col = colors.orange
+local lastPlayer = ""
-    elseif wasCol == colors.orange then
+
-        if r >= 0.5 then
+function fireLaser(y, p, w)
-            col = colors.green
+	return pcall(systems.fire, y, p, w)
-        else
+end
-            col = colors.red
+
-        end
+function uselessLasering()
-    elseif wasCol == colors.green then
+	fireLaser(0, math.random(240, 300), 0.1)
-        col = colors.red
+end
-    end
+
 function setColor(col)
-    mon.setBackgroundColor(col)
+	mon.setBackgroundColor(col)
-    mon.clear()
+	mon.clear()
 end
-    wasCol = col
+
 function getYawPitch(entity)
-    sleep(3)
+	local x, y, z = entity.x, entity.y, entity.z
-end
+	local pitch = -math.atan2(y, math.sqrt(x * x + z * z))
 	local yaw = math.atan2(-x, z)
 
 	print(yaw, pitch)
 
 	return math.deg(yaw), math.deg(pitch)
 end
 
 function status(col)
 	local topLine = ""
 
 	if col == colors.red then
 		topLine = "No Entry"
 	elseif col == colors.orange then
 		topLine = "Wait for it..."
 	elseif col == colors.green then
 		topLine = "Fine..."
 	elseif col == colors.yellow then
 		topLine = "Er."
 	elseif col == colors.white then
 		topLine = "This is fine..."
 	elseif col == colors.blue then
 		topLine = "Oops."
 	end
 
 	sign.setSignText(topLine, "I'm " .. os.getComputerLabel(), "Hi " .. lastPlayer, "")
 end
 
 function runLights()
 	while true do
     	local r = math.random()
     	local col = nil
 
     	if wasCol == colors.red then
         	col = colors.orange
     	elseif wasCol == colors.orange then
         	if r >= 0.2 then
             	col = colors.green
         	elseif r >= 0.05 then
         		col = colors.red
         	else
 				col = colors.yellow
 			end
     	elseif wasCol == colors.green then
         	col = colors.red
 		elseif wasCol == colors.yellow then
 			if r > 0.3 then
 				col = colors.blue
 			else
 				col = colors.green
 			end
 		elseif wasCol == colors.white then
 			if r > 0.8 then
 				col = colors.blue
 			else
 				col = colors.white
 			end
     	else
 			col = colors.yellow
 		end
 
 		if r > 0.95 then
 			col = colors.white
 		end
 
 		status(col)
 
     	setColor(col)
 
     	wasCol = col
 
 		uselessLasering()
 
     	sleep(3)
 	end
 end
 
 function handleEntities()
 	while true do
 		local ok, entities = pcall(systems.sense)
 
 		if ok then
 			for _, e in pairs(entities) do
 				if e.displayName == "ndiniz2012" or e.displayName == "Keanu73" or displayName == "nagoL2015" or displayName == "Twijn" then
 					setColor(colors.magenta)
 					local y, p = getYawPitch(e)
 					fireLaser(y, p, 0.5)
 					sleep(0.5)
 				elseif e.displayName == "gollark" then
 					setColor(colors.green)
 				elseif e.displayName == "reboot" then
 					os.reboot()
 				elseif e.displayName == "nothjarnan" then
 					for i = 0, 15 do
 						setColor(math.pow(2, i))
 						sleep(0.1)
 					end
 				elseif e.displayName == "EldidiStroyrr" then
 					for i = 0, 10 do
 						print "E"
 					end
 				end
 
 				lastPlayer = e.displayName
 			end
 		end
 
 		sleep(0.1)
 	end
 end
 
 function update()
 	while true do
 		print "Checking firmware database"
 		local req = http.get "https://pastebin.com/raw/8VhRA26t"
 		local newCode = req.readAll()
         print "Downloaded."
 
 		print "Loading existing startup..."
 		local f = fs.open("startup", "r")
 		local oldCode = f.readAll()
 		f.close()
 
 		print "Checking syntax"
 		local syntaxChecks = loadstring(newCode) ~= nil
 
 		if not syntaxChecks then
 			print "Syntax error. Update cancelled."
 		else
 			print(syntaxChecks)
 		end
 
 		if newCode ~= oldCode and syntaxChecks then
 			print "Flashing..."
 			local f = fs.open("startup", "w")
 			f.write(newCode)
 			f.close()
 			print "Flashed"
 			sleep(1)
 			os.reboot()
 		end
 
 		sleep(60)
 	end
 end
 
 for i = 1, 10 do
 	setColor(colors.black)
 	sleep(0.2)
 	setColor(colors.white)
 	sleep(0.2)
 end
 
 parallel.waitForAll(runLights, handleEntities, update)