fredag 30. august 2013 skrev Joseph Muhlhausen <address@hidden> følgende: > I had a similar issue with a 868LP. I think it was a current spike in my case, I solved it with a 470 uF capacitor between VCC and GND on the xbee connected to the autopilot.
> Joseph > > > > On Wed, Aug 28, 2013 at 11:36 PM, Helge Walle <address@hidden> wrote: >> >> Hi all, >> >>
>> >> I am having trouble with my telemetry. It seems not to be connected to Paparazzi releases. I have experienced this both on v4.2 and v5.0. Currently I am using v5.0 on a PC with Ubuntu 12.04 LTS. >>
>> >> >> When I execute GCS and power up the TWOG, then more often than not, the telemetry does not start, and GCS does not get populated. I may have to retry several times before communication initiates. Retrying means stopping/starting GCS and Paparazzi Center, powering the TWOG on/off, or restarting the PC in various orders. Also plugging the ground modem out/in.
>> >> >> >> dmesg shows that the level converter is detected by the PC. >> >> >> >> When powering the TWOG, after it and the Sparkfun SEN-10121 IMU has initialized, there is a tiny twitch from the servos. Then the RSSI led on the Sparkfun breakout board lights up for approx. 1 second, then nothing more happens. This is when communication fails.
>> >> >> >> If communication starts, I can see one brief blink on one of the tx/rx leds, and then after a second or so, the leds start flashing alternately. In this case it is reliable, range is good, and I have not had any modem glitches in flight.
>> >> >> >> The modems are 2.4GHz XBee PRO series 2. In the plane I have soldered the pins on the modem directly to the wires from the TWOG. >> >> >> >> Any idea on what could cause this and where to search? Also, is it the ground station or the autopilot that initiates communication?
>> >> Thanks for your help, >> >> Helge. >> >> _______________________________________________ >> Paparazzi-devel mailing list >> address@hidden
>> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel >> > >