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Re: [Paparazzi-devel] First power-up of Autopilot OK, some questions

From: Martin P
Subject: Re: [Paparazzi-devel] First power-up of Autopilot OK, some questions
Date: Sun, 17 May 2009 21:50:26 +0200

Tried again. 

Tried directly connecting the ground station adapter to the autopilot (pins 2 
to 3 and 3 to 2 and connecting ground, pin 10 to 10): nothing. Same as trying 
with the modems. 
Made sure if the ground station adapter can work without a modem by locally 
connecting pin 2 to pin 3 and doing a loopback test in the xctu software. 

The messages window is empty. 

The strange thing: On the very first try, the ground station was populated and 
I saw the red/green flashing link indicator with increasing numbers. Ever 
since: nothing. 

The 868's were part of the "everything you need kit" by Cehbuzz. He wrote that 
he tried the modems and they work. 

Greetz, Martin 

-------- Original-Nachricht --------
> Datum: Fri, 15 May 2009 10:33:14 +0100
> Von: Gareth Roberts <address@hidden>
> An: address@hidden
> Betreff: Re: [Paparazzi-devel] First power-up of Autopilot OK, some   
> questions

> Sorry if I wasn't clear!
> If the duty cycle is the problem, increasing the baud rate of either 
> paparazzi or the modems will not help, at best it'll just stretch the 
> time until they stop working to maybe 10 minutes.  There is basically 
> nothing you can do to fix this.  The XBee needs to only transmit 10% of 
> it's time.  Paparazzi telemetry is a continuous stream of messages, and 
> so it won't work with the 868's (unless you do something like resetting 
> them every few minutes).
> As for the 1mW thing, you are right, I talked to Digi live chat a while 
> back and the chap definitely recommended that (said I'd get a few miles 
> @ 1mW as well) until he found out I was trying to stream data, at which 
> point he said it wouldn't work at all.
> The idea about connecting the boards is very cunning, and should work 
> (although you will need a common ground as well).  I would recommend a 
> serial cable though, I don't have an FTDI one, I use a Brainstem (though 
> any 3V tolerant TTL level convertor will work), a power supply made from 
> an LM78 and paperclips, a dodgy old USB->Serial adapter and a spare 
> molex connector and some loose wires to connect to the paparazzi. Not 
> that I'm on a budget or anything...If you are at a university or large 
> org, it's exactly the kind of stuff someone will have in a cupboard 
> somewhere.
> As for the GCS view, if you are wondering whether it's your GCS or 
> modem, go Tools -> Messages.  If you get a tiny window you can't see, 
> and it doesn't fill with tabs that flash green, you're problem is 
> outside the computer.
> As I said originally, I bought a pair of 868's, but they just don't work 
> (at least not without the reset hack).  Certainly while you are 
> starting, try and get a set of XBee Pro 2.4GHz (they even play ok with 
> video with some fiddling, I promise).
> --G
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> Paparazzi-devel mailing list
> address@hidden

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