http://nada-labs.net Straight from the workbench of Nathan Dyer. Fri, 27 Jan 2012 10:46:04 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://nada-labs.net/2010/gps-logger-v-full-hardware/ http://nada-labs.net/2010/gps-logger-v-full-hardware/#comments Fri, 05 Mar 2010 09:52:19 +0000 nada http://nada-labs.net/?p=41 http://nada-labs.net/2010/gps-logger-v-full-hardware/feed/ 2 http://nada-labs.net/2010/gps-logger-ii-gps-interfacing/ http://nada-labs.net/2010/gps-logger-ii-gps-interfacing/#comments Wed, 10 Feb 2010 03:05:39 +0000 nada http://nada-labs.net/?p=25 The system is now up and running. It is capable of communicating with the GPS receiver to get it into a known protocol (NMEA) and baud rate from an arbitrary starting configuration. I had to determine the pinout for the receiver as it was a USB GPS receiver. A check with the multimeter quickly identified the pinout of the four wires, TX was easy to spot as it was a constantly changing voltage whereas RX only changed when a command was sent. Once the prototyping is finished the USB receiver will be restored to its former glory. A few challenges were involved in figuring out the receivers startup configuration. It looks like at reset it outputs NMEA at 4800 baud but expects to receive NMEA configuration commands at 9600. This 'interesting' configuration was overcome by sending NMEA and SiRF configuration commands to the receiver at all supported baud rates.]]> http://nada-labs.net/2010/gps-logger-ii-gps-interfacing/feed/ 0 http://nada-labs.net/2010/building-a-gps-logger/ http://nada-labs.net/2010/building-a-gps-logger/#comments Mon, 08 Feb 2010 04:43:04 +0000 nada http://nada-labs.net/?p=20 http://nada-labs.net/2010/building-a-gps-logger/feed/ 0