Boat projects

             NMEA SD logger.

            Simple NMEA Data logger, store all your trip to SD card 1Gb supplied.

               Manual

         SD NMEA multiplexer

   Note the multiplexer also comes with no SD cheaper.

   Also download software to convert the GPS data to goggle earth format.

   below a sample of me walking the dog in the park.

sample goggle earth file for above, just down load and double click, need goggle earth installed.

Download dog walk.klm

   A simple NMEA multiplexer design no set up required.

  It switch's to each input in turn and send's data to the output

  channel.

  It detects gaps in the NMEA data and then switch's to the next

  channel. This is OK for repeated data like GPS,wind,depth ect

  but it is not fully buffered so one off messages could be lost.

  Also logs all data to the 1Gb SD card supplied, so no need to leave

  the laptop on while recording a trip

  Main features

 1) NMEA buffer

 2) GPS Alarm, need speaker

  3) GPS backup, if one fails then other switched in.

  4) NMEA multiplexer with PC

  5) Log all Data to SD card so no laptop need until later to upload

       Save your boats battery.

        Features

            USB interface

            SD card logging

            4 opto-isolated inputs 680 ohm input impendence

            Differential drive output (RS422 levels only)  drive 2 opto inputs

            4 Leds for active channel

            SD card logging Led

            Supply voltage 7-20 Volts.

            Power 15ma @ 12V  200mW.

            No data alarm feature on channel 1

            Auto detect which channels have data

           Download manual   manual

           Connections

            From top-to bottom  of the unit

            1)  +Battery  7-28V(Don’t connect USB & battery same time!!!)

            2)   0V

            3)   CH1 A+(+Input for opto for channel 1)

            4)   CH1 A- (-Input for opto for channel 2)

            5)   CH2 A+

            6)   CH2 A-

            7)   CH3 A+

            8)   CH3 A-

  9)   CH4 A+

  10) CH4 A-

  11) Ground

  12) A+ Out(TTL out put max current 25ma)  connect to autohelm ect

  13) A+ Out(TTL out put max current 25ma)  connect to autohelm ect

  14) Ground

  15) A- Out (invert of A+ Max 25ma) for RS422 level can also connect to a PC

  16) Speaker connection(1khz 22ma) alarm if no channel 1 data (gps alarm)

           Radio control sonar boat using multiplexer.

            More information survey information

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This site was last updated 06/27/09