The GPS Receiver

by Web FishJan 4, 2013 @ 10:47am

Provides current position (and optionally direction/speed). 

  • Current selection: Adafruit Ultimate GPS Breakout board
  • Status: Finalized

  • Criteria: Reliable satellite signal acquisition when installed inboard, standard I/O, small physical footprint, cost 
  • Finalists: Adafruit Ultimate GPS v.3, Sparkfun GPS LS20031
  • Main decision factors: External antenna connector (makes board mounting position and packaging less relevant), standard I/O on two GPIO pins, sensitivity

 (click image for larger view) 

Spec highlights:

  • -165 dBm sensitivity, 10 Hz updates, 66 channels
  • 5V friendly design and only 20mA current draw
  • PPS output on fix
  • Internal patch antenna + u.FL connector for external active antenna

 

Caveats:

  • Will not know for certain if external antenna is needed until the navionics bay design and mounting is finalized
  • As an added bonus module provides current time-stamp for syncing Netduino internal clock after reboot (no battery back-up for the clock on the Netduino board - anyone remembering early Apple II days?)

 

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