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Sebastian Ungerland replied to Sebastian Ungerland's discussion Sonar alt hold Copter rises but does not descend again. Sonar noise ? Need help !
"Honestly nobody ideas ? Is there someone who could take a look at the logfile ? This behavior is strange.. I verifiesd it in multiple flights now. The sonar altiitude matches the baro, but sonar desired alt does not change ! What is wrong ?"
Apr 16, 2015
Sebastian Ungerland replied to William Cox's discussion Large frame Quadcopter motor options
"Hi Will,
i dont think that you could pick much better motors than the U8. The vibrations you experienced are very likely caused by insufficient balancing of the props. Or you bought used motors that have been crashed and have a bended shaft…"
Apr 2, 2015
Sebastian Ungerland replied to Sebastian Ungerland's discussion Sonar alt hold Copter rises but does not descend again. Sonar noise ? Need help !
"Hi Gregor,

yes I did... the sonar is mounted on foam, shielded with a can and I also used the capacitors as suggested in the maxbotix article. As you can see in the log, the values seem to be correct. However I wonder why the copter reacts…"
Apr 2, 2015
Sebastian Ungerland replied to Sebastian Ungerland's discussion Sonar alt hold Copter rises but does not descend again. Sonar noise ? Need help !
"Added a screenshot... Alt seems to follow Dalt.. but why does dsAlt not change ? I marked with red arrows where I was walking underneath the copter... it climbed but does not come back down... honestly nobody any ideas ?Graph.JPG"
Mar 27, 2015
Sebastian Ungerland replied to William Cox's discussion Unequal battery draw with lipos connected in parallel
"Hi,

I always use these little lipo warners. They dont give me the drawn mah´s, but much more important the prevent me from discharging single cells too low and warn me when cell voltage drops because of full throttle accelerations. Why dont you try…"
Mar 26, 2015
Sebastian Ungerland replied to Sebastian Ungerland's discussion Sonar alt hold Copter rises but does not descend again. Sonar noise ? Need help !
"Added bin file2015-03-25 18-18-47bin.rar"
Mar 25, 2015
Sebastian Ungerland replied to William Cox's discussion Unequal battery draw with lipos connected in parallel
"Hi Will,

probably your charger had a bad day counting the amps... i would try again. If this occurs regularly it can only be explained by

1. A difference in capacity of one battery -> the 8000mah one has lost 8000mah in capacity
2. A difference in…"
Mar 25, 2015
Sebastian Ungerland posted a discussion
Hi Forums,I attached a Maxbotix 1240 sonar to my pixhawk and it works good so far. All testings on my desk show correct sonar values. However while flying in alt hold I can use sonar to rise by standing simply underneath it but then it wont descend…
Mar 25, 2015