Can't Take off in Alt-Hold with a Sonar
I am using an IRIS+ running arducopter 3.3.3 with a MB1242 I2CXL-MaxSonar-EZ4 sonar and I am attempting to get the drone to hover indoors (I plan to add a px4flow as soon as I get this working). When I take off in Alt-Hold with the Sonar disabled (co
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