Hello all,

I opened the case of my bluetooth gps and it seems to have a little plug (see red circle on the picture below). Do you think it's a nmea output ?

thanks.

Views: 47

Reply to This

Replies to This Discussion

It could be, and would be pretty easy to verify. It would only need 2 connections, one for ground and one for the data line. If you have a O-scope this would be riduclously easy to see but I'm assuming you don't based on the post. So you're going to (I assume) setup a ttl > rs232 transceiver for a serial port on a computer, start hyperterminal with 4800-N-8-1 and see what you get. If you get "$G" or something similiar on the output of one of the lines you are good to go. If you get data but it isn't readable the baud rate might be 9600 or something different (maybe) or the output line might be logically inverted (maybe). The second would be more difficult to verify but sometimes you can find this in one of the settings of the device or you can do a hexdump to a dos prompt and there is probably a program online that could convert it for you. Or, since I assume you eventaully intend doing somethign with a microcontroller you could do that in your program as well. Good luck!
My father have a O-scope. How do I check with the o-scope if it's a nmea output ?

thanks for the help
Connect the ground on the scope to a ground on the device. Probe each line on the connector until you see a pulse coming out of it, you should see something I would think. Look at the voltage of the signal, if its +/- 12 V or about it is a RS232 signal and you can probably hook it right up to your computer. When they do this on these devices its to aid in troubleshooting at the factory. It is probably +5/0 V though. For more information google RS232 and look at the wikipedia page.
ok thanks, I'll check it later this week.

RSS

Contests

Season Two of the Trust Time Trial (T3) Contest has now begun. The third round was a reliablilty/aerial photography round for both planes and copters, which is now closed. Stay tuned for the next round, beginning soon.

A list of all T3 contests is here

 

© 2012   Created by Chris Anderson.

Badges  |  Report an Issue  |  Terms of Service