Hacking the EverMore GM-R900 GPS Module

Posted 24 Jul 2007 at 16:23 UTC by steve Share This

Dean Hall needed an inexpensive GPS module that could interface with a microcontroller for use on his outdoor robot project, named Argonaut. He started by comparing the two least expensive USB GPS modules, the Holux GR-213 and the EverMore GM-R900, both of which use the SiRFstarIII chip. Indoor reception, outdoor reception, and other details were compared before selecting the GM-R900. Dean then offers photos and technical details of the GM-R900, revealing that the board itself has a serial connection which goes through a serial to USB adapter in contained in the cable. The serial interface uses standard NMEA protocol and should be easy to connect to virtually any microcontroller. Dean has also written some Python code to communicate with the GM-R900.

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