Made the serial loop run twice because sometimes it doesn't catch on the first try.

cgi-bin/access.rb

@@ -29,6 +29,8 @@ puts "Content-type: text/html \r\n\r\n"
 
 if users[cgi['user']]['pass'].to_s == (Digest::SHA2.new(bitlen=512) << cgi['pass']).to_s then
 
+  2.times do #do the serial stuff twice as sometimes the serial port is occupied
+    
     serial = SerialPort.new("/dev/ttyUSB0", 57600, 8, 1, SerialPort::NONE)
     serial.print "e 1234\r"
 
@@ -66,6 +68,8 @@ if users[cgi['user']]['pass'].to_s == (Digest::SHA2.new(bitlen=512) << cgi['pass
     serial.close
     puts ' <a href="/~access">Return.</a>'
 
+  end
+
 else
   puts "Invalid username or password."
 end