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DeveloperPermalink Reply by Randy on January 11, 2012 at 7:29am

Both are used.  Sonar for low altitude, Barometer for high altitude.

 

If you move to APM2, you'll find it has a much improved barometer..so much better than you may decide that you don't need a sonar.

Permalink Reply by Sugeng Priyono on January 11, 2012 at 8:09am

ok, thank you Mr. Randy...... I'm currently use APM 1.4

I still have  a question.......why does not my Quadcopter fly stable?, it flies up and down when I switched to Alt_hold mode from My radio at 2 meters height. 

Permalink Reply by Cliff Dearden on January 11, 2012 at 8:45am

Randy, is it possible to buy this improved barometer to replace the old one on the 1280 board? Knowing my

luck I bet the pin connections are differant and/or the software has to be modified. 

Permalink Reply by Sugeng Priyono on January 11, 2012 at 4:17pm

I upload my video and it sound the motors seem try to stand the Quadcopter, but I don't know finnaly it's landing, can I adjust the PI control on altitude hold in APM Planner to get good configuration? now I currently use APM Planner 1.1.2.

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