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Feb 03, 2007, 07:18 AM
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FredericG's Avatar
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Build Log

It starts working !!!!

Lots of progress to report !!!

By coincidence I discovered this little free tool:
It is a GPS simulator and can generate NMEA messages on the serial port. It can simulate a track in a form of a circle, square and spiral. This might be useful for testing our systems. It works on Linux and Windows.

I received the PIC with more memory a few days ago and for the first time I could place all code at once in the controller: NMEA parsing, calculations and displaying.

I now test with gpsfeed; a PC generates NMEA messages an simulates that we are describing a path in the form of a square. This goes to the OSD module. The first valid coordinates it gets is considered as the pilot position.

What you see on the picture below is the output of the OSD module. As background image you see the PC screen where gpsfeed runs.

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Jul 25, 2008, 09:29 PM
Old retired Electronics Fart
Charles B's Avatar
I like your project ! I have wrote JavaScript to do the distance and degrees for a point
with out the use of floating point. If you would want it.
It is fairly doc.

You can see the use at

and you look at the JavaScript code by

I hope this helps you is some way.

I'm in the process of connecting a GPS to a PIC that connects to a PC via RF to
do farm ponds contours by a RC boat. The PC is programed in VB6.

Oct 03, 2008, 09:42 PM
Old retired Electronics Fart
Charles B's Avatar
Thanks for pointing out the gpsfeed program. It has help me a lot to get my
Caluclation correct. I just wash he put in a help file to the program.

Just switch from Stamp module to mega88 for (OSD) and mega168 .


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