RC, photos & tech


APM Arducopter: Problem with Altitude Hold Solved

The problem:

As soon as I engage Altitude hold on my Arducopter Hexacopter, it shoots up instead of holding a nice steady altitude as expected.

The solution:

My throttle mid-point was not exactly at centre and when I engaged Altitude hold, the throttle stick becomes an altitude adjustment control as opposed to a throttle meaning relative to the centre position, if the stick is up, the Hex will rise. If the stick is below centre, it will fall. I analysed a logfile where I had been hovering in a nice stable position and found my throttle setting to be about 480. I thought this would have been close enough to the default (500) but apparently not because after adjusting THR_MID, the Hex hovered perfectly in position.

These URLs helped me identify and solve the problem:

A GoPro, a gimbal and a hex

The gimbal has been mounted on the F550 hex. Just need to tidy up some wiring, mount a 3S to power the gimbal, find a new spot to mount the new 4S main battery and run a cable to switch the gimbal tilt 90 degrees manually.




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Imitation DJI F550 build

Parts used in this build;

H550 V2 Glass Fiber Hexcopter Frame 550mm - Integrated PCB Version

9 Mode Multi Colour/Multi Function LED strip with Control Unit

Hobbyking KK2.0 Multi-rotor LCD Flight Control Board

NTM Prop Drive Series 28-26A 1200kv / 250w

NTM Prop Drive 28 Series Accessory Pack

TURNIGY Plush 30amp Speed Controller

Slow Fly Electric Prop 8045R (4 pc - Green, RH Rotation)

Slow Fly Electric Prop 8045SF (4 pc)



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