Hello all,
I have been using multiwii on my quadcopter (own design foldable) for more than a year now, but have recently updated the system with a new pro board (readytoflyquads) with GPS.
I was testing the GPS mission functionality a few days ago and thought to find out how the quadcopter would react on RC transmitter outage. I think i have read somewhere that failsafe is something on the todo list for 2.4, but I wanted to see what the behaviour was. So I uploaded a small mission (4 waypoints, via EZ-GUI GS), put the quadcopter in the air, started the mission and during the mission I turned the RC transmitter off. Beforehand I made sure that the mission 'switch' would stay on (mission 'on' at aux-switch-states 'mid' and 'high', mid is what the receiver gives when transmitter is off). After turning off the transmitter, the mission was neatly continued (as i expected). But then when i switched the transmitter back on (simulating the quadcopter returning within reach), the quadcopter went into a fast spiral. After two complete turns (radius about 3-5 meter) i was able to regain control only after quickly turning the mission switch off. Oeff.
OK, i know I was testing a feature not yet available, but i have some questions:
- has anybody allready tested the same procedure and with what results?
- is the uncontrolled spiral (i imagine that the mag sensing is confused) expected, or even explainable behaviour?
- am i right in expecting the failsafe function for a quadcopter that is performing a mission would be to finish the mission first (on a well planned mission this would be near the home position), and after that perhaps hold position, or land.
I have seen some videos on youtube where, with other flightcontroller, during a preplanned mission the RC connection was lost and later re-established while the mission continued, so this could be a reasonable aproach.
Any thoughts, answers?
Greetings, Dirk