Introducing the Serialport_gps gem

Defaults:

• port: /dev/ttyAMA0

• baud_rate: 96000

• refresh_rate: 8 seconds

  require 'serialport_gps'

  gps = SerialPortGPS.new gps.start

Output:

{:time=>2014-07-05 21:53:40 +0000, :latitude=>55.92721483, :longitude=>-3.13518783}
{:time=>2014-07-05 21:53:44 +0000, :latitude=>55.92720717, :longitude=>-3.13513767}
{:time=>2014-07-05 21:53:52 +0000, :latitude=>55.92721417, :longitude=>-3.135116}
{:time=>2014-07-05 21:54:00 +0000, :latitude=>55.92722817, :longitude=>-3.13505783}
{:time=>2014-07-05 21:54:08 +0000, :latitude=>55.92722067, :longitude=>-3.1469765}
{:time=>2014-07-05 21:54:16 +0000, :latitude=>55.92720633, :longitude=>-3.13509533}
{:time=>2014-07-05 21:54:24 +0000, :latitude=>55.92720567, :longitude=>-3.1350735}
{:time=>2014-07-05 21:54:32 +0000, :latitude=>55.92721317, :longitude=>-3.13508183}

There is a callback proc which can be passed in at initialization which is triggered when new GPS data has arrived. The default callback which can be seen from the output above is used for testing purposes, as well as demonstrating what the gem outputs.

require 'serialport_gps'
 

gps_notification = lambda do |x|
  puts "%-13s %-12s, %-12s" % 
                       [x.time.strftime("%H:%M:%S%P"), x.latitude, x.longitude]
end

gps = SerialPortGPS.new callback: gps_notification
gps.start

output:

GPS listener starting ...
GPS listener created

09:08:01am    55.94625383 , -3.1169905  
09:08:09am    55.9462515  , -3.11973   
09:08:17am    55.94624667 , -3.116976

• Introducing the NMEA parser gem
• jrobertson/serialport_gps

gps serialport gem