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From: | Wolfgang Schaeper |
Subject: | Re: [Paparazzi-devel] Telemetry not starting. |
Date: | Wed, 16 Jul 2014 11:27:26 +0200 |
Hi Helge, I am struggling with
exactly the same problem with my 2.4 GHz Xbee Pro Series 2 on Tiny 2.1.1 with
PPRZ V5.1.1 on Ubuntu 13.10. Communication starts scarcely,
in many cases only after compilation and flashing, but afterwards never again. I have two sets of Xbees.
Both behave the same way. The problem does not
occur when I run my old PPRZ from the Xmas 2008 CD-ROM on the same hardware
with the same Xbee configurations. Did you find a fix? I can't believe that the
extra capacitor helps, because the links runs with the old PPRZ. Thanks for help, Wolfgang Von:
address@hidden [mailto:address@hidden
Im Auftrag von Joseph Muhlhausen 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 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? Helge.
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