I have a brand new MB 1200 sonar, but I cant seem to get it to work. What happens when I flick the Alt Hold switch at low altitude, (~2m) is that my quad will rise slowly and then at about 10m then the motors slow down and the quad just drops. I have attached a log file from that flight as suggested by Randy and it seems that the baro and sonar readings don't tally. Do I have a bad sonar? II have already installed the resistor/capacitor filter and use a 2 core shielded cable to connect everything up. And yes, I did choose the correct sonar in APM Planner.
Yes the 'alt' reading updates from 0.2 and varies when I point the sonar around. It also changes from 20cm onwards when I use the CLI test-sonar function.
But according to your log file, as seen on the pic I posted above, it was not working at all. If you have no problem doing a static test, it could mean that the power providing to the sonar is still not clean enough, or simply just not enough.
You can try again and do some very simple hover to a couple of meters high, and then land. Download the log file and look at the Sonar Alt line. You should see the line starting from 20, all the way up to a few hundreds, and then back to 20 when you land.
It should look something like this:
Is that your log from the MB1260? (XL-EZLO)
I could never get mine looking like that!
Yeap. The MB1260. Now that I have a separate power supply to the APM2, the signal are super clean. It helps big time on the OSD as well. Very sharp and clear pictures.
EDIT: but it is very sensitive. It can pick up a log or a rock on the ground and cause the heli to jump up. lol.
Yeah! Thanks Wesley, the separate power supply did the trick. The low altitude hold now is rock solid. Do you think that shielding the baro with cotton wool of sponge will reduce the motor pulsing at > 10m?
It depends if your baro is being affected first. Plot the baro and see if it follow the Sonar Alt and see if it's close enough. Mine is way off and highly affected by my blades. I'll have to create a case surrounding it later on.
I you have any support questions, please don't hesitate to send me an email.