Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on August 8, 2012 at 8:53pm

Have you verified that you are indeed in Alt Hold mode? (Check MP if you have telemetry or logs). Even if the sonar wasn't enabled, the baro should hold altitude pretty well. 

Permalink Reply by Dean White on August 8, 2012 at 9:54pm

I think you are right, looks like I have not got my TX correctly configured

Permalink Reply by Mike R. on August 8, 2012 at 10:46pm

Just an FYI for future reference as well: You can test the sonar specifically by itself via the terminal window in MP.. Once you're connected to your quad and have the prompt up (that states your firmware version within it) type:

test<enter>

sonar <enter>

This will give you a readout loop of the sonar sensor until you press enter again.. It will always say ~20cm when you are 20cm away or closer to the sensor, but should give you other readings if you raise/lower your quad by hand while looking at the screen.

Also, (I may be wrong as it's almost 2am over here) but I believe POS Hold does not use the baro or sonar - it's basically an elevator mode - it holds position in x and y, but you control throttle to let the copter change altitude as if you were in stable.. Alt hold has the opposite effect: it holds altitude, but allows you to change x and y movement :) So you want to focus on alt hold within a few meters of the ground if you want to use the sonar.. Once you get sonar working, it's great :p

Good luck!

Permalink Reply by Dean White on August 9, 2012 at 12:08am

Thanks Mike.

Chris was correct I did not have my TX flight modes configured correctly. I just tested it in the backyard and it is working.

Thanks once again guys for your help