# NMEA , request for real live sample **URL:** \ **Category:** Ruby\ **Created:** [May 9, 2007, 9:10am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685 "2007-05-09T09:10:06Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 9, 2007, 9:10am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/1 "2007-05-09T09:10:06Z")
Dear All … Is there any easier to understand sample of ruby nmea parser ( [http://rubyforge.org/projects/nmea/](http://rubyforge.org/projects/nmea/) ) ?? I need to parse NMEA , and re format it to YAML. I tried to : —START— require ‘serialport’ require ‘nmea’ @sp = SerialPort.open(“/dev/ttyS1”, 4800, 8, 1, SerialPort::NONE) @handler = NMEAHandler.new while(@sentence = @sp.gets) do puts NMEA.scan(@sentence, @handler) end —STOP— but it only print “nil” I thought that my system is not well wired, so I make a test using miniterm.rb from the serialport library, and here is the result —start— [root@kannel test]# ruby ./miniterm.rb 1 4800 8 1 $GPRMC,135444,A,3815.4477,N,02349.5804,E,10412.9,243.3,090507,5,E,A_B $GPRMC,135446,A,3810.5221,N,02344.4003,E,11501.1,219.6,090507,5,E,A_B $GPRMC,135448,A,3803.9503,N,02341.4152,E,12561.9,199.7,090507,5,E,A\*B —stop---- Note : My test system is 1. GPS Feed : Using a PC running GPSFeed+ 2. Ruby on the other Linux PC 3. The two PC is connected via a null-modem cable. Sincerely -bino- ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 9, 2007, 11:27am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/2 "2007-05-09T11:27:32Z")
Look at release 0.2 ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 9, 2007, 11:37am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/3 "2007-05-09T11:37:07Z")
Dear Max and all ----- Original Message ----- From: “Max L.” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Newsgroups: comp.lang.ruby To: “ruby-talk ML” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) Sent: Wednesday, May 09, 2007 3:48 PM Subject: Re: NMEA , request for real live sample > accept such unnatural sentences, but it is very, very strange for me. > What GPS device do You use? I wish to look at it documentation, perhaps > I’ve missed something in standart. It’s not “real GPS” … It’s a windows pc running gpsfeed software from → > **[gpsfeed+](https://sourceforge.net/projects/gpsfeed/)** > > Download gpsfeed+ for free. A software gps simulator. A software gps simulator, providing TCP/IP, UDP, http and serial port connectivity in NMEA 0183, XML or user defined output format. Usable for testing all kinds of GPS applications. From my table, I can not get GPS signal … thats why i use such “emulator” Regards -bino- ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 9, 2007, 10:48am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/4 "2007-05-09T10:48:56Z")
Bino Oetomo wrote: > [root@kannel test]# ruby ./miniterm.rb 1 4800 8 1 > $GPRMC,135444,A,3815.4477,N,02349.5804,E,10412.9,243.3,090507,5,E,A_B > $GPRMC,135446,A,3810.5221,N,02344.4003,E,11501.1,219.6,090507,5,E,A_B > $GPRMC,135448,A,3803.9503,N,02341.4152,E,12561.9,199.7,090507,5,E,A\*B You see, this NMEA sentence differ from what I assumed to be standard. There is unknown checksum in the end. I can modify parser so, that it would accept such unnatural sentences, but it is very, very strange for me. What GPS device do You use? I wish to look at it documentation, perhaps I’ve missed something in standart. Regarding NMEA.scan, it will never return anything. It can only call method rmc on NMEAHandler. ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 9, 2007, 12:18pm UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/5 "2007-05-09T12:18:29Z")
Bino Oetomo wrote: > It’s not “real GPS” … > It’s a windows pc running gpsfeed software from → > [gpsfeed+ download | SourceForge.net](http://sourceforge.net/projects/gpsfeed) > From my table, I can not get GPS signal … thats why i use such > “emulator” Understand. According to [http://www.werple.net.au/~gnb/gps/nmea.html#gprmc](http://www.werple.net.au/~gnb/gps/nmea.html#gprmc), this software violates standard, that is why it was not parsed. Now it is parseable, but checksum correction is disabled. ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 10, 2007, 6:43am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/6 "2007-05-10T06:43:23Z")
require ‘test/mocks’ class NMEAHandler def rmc(\*args) puts args.inspect end end You will not receive anything, unless NMEA handler locate Latitude class, so You should include mocks.rb, unless You have anything better. ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 10, 2007, 2:48am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/7 "2007-05-10T02:48:37Z")
Max L. wrote: > Understand. According to > [http://www.werple.net.au/~gnb/gps/nmea.html#gprmc](http://www.werple.net.au/~gnb/gps/nmea.html#gprmc), this software > violates standard, that is why it was not parsed. > > Now it is parseable, but checksum correction is disabled. Thanks Max. So … I need to find my GPS … lying somewhere in my workshop BTW … Can you give me another sample script ? Maybe a script that print out each variables ? Thanks in advance -bino- ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 10, 2007, 9:49am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/8 "2007-05-10T09:49:10Z")
Look at the test/mocks.rb class NMEAHandler def rmc(time, latitude, longitude, speed, course, magnetic\_variation) … thus You can get latitude ---
**Author:** ![bino](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/b19c9b/32.png) [@bino](https://www.ruby-forum.com/u/bino)\ **Post date:** [May 10, 2007, 8:47am UTC](https://www.ruby-forum.com/t/nmea-request-for-real-live-sample/103685/9 "2007-05-10T08:47:08Z")
Dear Max. Thanks for the response First I make a subdirs inside ruby lib , with the name “nmea” And make a copy of your mocks.rb into it I try this : —Start— require ‘serialport’ require ‘nmea’ require ‘nmea/mocks’ class NMEAHandler def rmc(\*args) puts args.inspect end end @sp = SerialPort.open("/dev/ttyS1", 4800, 8, 1, SerialPort::NONE) @handler = NMEAHandler.new while(@sentence = @sp.gets) do @handler.rmc(@sentence) end —Stop---- And it produced : ["$GPRMC,134632,A,0004.3300,N,00004.3300,W,005.0,315.0,100507,000.0,W\*76\r\n"] Kindly please show me how to … i.e “puts” just a single “latitude”. Sincerely -bino-