problems with sonar .

hello every one..

1.i have got the same problem as andrew. as soon as i switch the quad to alt hold mode it climbs up very fast.i have tested the sensor in the cli mode. i got pretty decent distance values. i have also tested the sensor using arduino and got the same distance values. i have used a lv ez4 and apm with 2560. i have been trying to solve the problem but i am not able to understand where the problem is comming from. i used ardupilotmissionplanner.

2. i want to try the ardupirates code.but i donot know whether ardupirates code supports 2560.

thank you

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  • Thats all I could think of as I had the same problem as you and centering the throttle when I switched resolved it.  I am sure there will be a patch or something for it lateron.

  • 100KM

    Ardupirates code should run fine on 2560, but I don't think it will do you much good.  I think your sonar is getting interference from your motors or esc's.  Is it mounted close to the motors or esc's ?

    Can you get a log of a flight where the alt_hold doesn't work so we can look at the actual sonar data the apm gets while flying ?  

    See also : http://diydrones.com/forum/topics/fixed-my-sonar-alt-hold

  • When you are hovering, check your thottle stick percentage, it might simply be that your throttle position is above center point and therefor telling the quad to change altitude.  If I fly 12x4.5 props, hover throttle is ok and quad sits at the height.  If I fly 10x4.5 props, my thottle input is at around 68% at hover so when I switch to alt hold, the quad starts to rise, so i center my throttle and then it holds ok.

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