I have two DYS Smart 3 Axis gimbal with Alexmos mini board
On both I did the update to 2.40 b7 and now on one I flashed the firmware 2.40b6 just to check if it was different.
I have several questions I'd like to ask you guys, as I can't find a straight answer to them and believe me... I've been around for some time.
So, here for the facts:
- I'm using Mobius actioncam and so, I have the backplate horizontal instead of vertical. Top direction is "-Z" and right direction is "-Y"; - My gimbal is balanced. Motors off, weights added, absolutely no movements when rotating the gimbal in a sphere like motion; - I have read the manual. RTFM is a rule of thumb for me; - I have tunned PIDs from scratch and I found a very good values set for working with the gimbal, no vibrations, no horizon drift; - When power on, the camera stays horizontal and: - on a touch on the front or back, the pitch motor instantly brings the camera to level again; - on a touch on either of the sides, the roll motor instantly brings the camera to level again;
Nevertheless, if I touch the camera and force it to turn (yaw) horizontally, it does NOT return to center. Instead, I feel some vibrations (steps skipped, possibly) and the camera stays more or less in the point where I pushed it into.
This is very bad for flight because of winds or hard turns.
I have been loosing a lot of footages because of the yaw not centering. When the UAV turns or is subject to winds a little bit stronger and it oscilates, the YAW will swing around, fixing the camera on random angles to the front of the aircraft.
Ok, people. It's official: I have my gimbal calibrated. BUT.... I had to go back to 2.3.b5 firmware. No way the 2.4.b7 could work correctly. The yaw was suffering too much, the vibrations were way to present... Now I just have to stiff the vibration dampers a bit with 1cm3 sponge cubes and it will be perfect. Wind is now over 20Km/h with around 40km/h gusts coming from several directions. Check the vegetation in the videos. Check the comparison taken at 13:00h and at 16:00h after the tuning. PIDs for this tuned version are: P - I - D - Power 30 - 0.16 - 20 - 125 15 - 0.10 - 10 - 90 30 - 0.16 - 20 - 125 inverted Gyro trust 80 ... Check the video: http://youtu.be/kYrKHgtCtG0