RE: [rcpilot-devs] GPS NMEA support

[PK W. <pe...@wo...>]

Interesting, a friend of mine and I have been investigating NMEA for a
unrelated purpose, support for navigational instruments used by sailors.
There are some existing interfaces in Java for this including a couple of
Sourceforge projects.
/peter
 

-----Original Message-----
From: rcp...@li...
[mailto:rcp...@li...] On Behalf Of Michael J.
Pawlowsky
Sent: Tuesday, March 09, 2004 8:31 PM
To: rcp...@li...
Subject: [rcpilot-devs] GPS NMEA support

I did a good amount of work on RCGS today.
A lot of it smaller back end stuff that doesn't show much, but has to be
done.

I started thinking about some of the complexity involved for the average
person to use RCGS.
The software itself is easy to use. The communication part is not very
difficult to setup.
The hard part will be building all the modules and having them communicate
with each other.
Although I still think this is the way to go, I thought that a low-level
solution would help the popularity of RCGS.

It led me to the idea that RCGS should support 2 third layer protocols.

The first one is the "Amateur UAV Telemtry Protocol".
This is the one I'm am currently defining.
There are some changes that will be made to it shortly after I received some
feedback from others doing similar projects.

The second one is simply NMEA.
This would allow someone to quickly use RCGS.
Basically simply plug your GPS into a modem (could even be the 1200 baud
modem that I'm using for tests right now).

Naturally the refresh rate would be terrible.
Approximately 1 refresh every 10 seconds. But this would allow ground speed,
course over ground, position information, waypoint information, off-track
error etc.

And it would be EXTREMELY easy to set up.

I was thinking that a good way to do this is to have the first byte of every
data packet a protocol identifier.

It could also be user selected in preferences but I prefer the identifier.

The other big one is adding serial support. I've been wanting to do this
from the beginning but haven't even looked into what's needed to do this.

So here goes the call for volunteers....

Does anyone want to take on either the serial transport engine and or NMEA
support?



MikeP






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