Litchi - Multiple POI Issue

Space Man · Feb 25, 2019

I am a NEW drone owner.

I was disappointed that DJI has not released Waypoints to CrystalSky, so I installed Litchi on my CrystalSky. The applications works well, all is good. I planned my first automated flight yesterday via the mission hub, with 2 POIs and a couple of waypoints. Somehow the drone didn't focus on the second POI, or it was offset somehow. Any ideas?

Here is the full video...

Here is the mission in mission hub

BD0G · Feb 25, 2019

You can try this.

I copied and pasted segments of a reply on Phantom Pilots.

-Place all the waypoints, then POI points.
-Set altitude of all waypoints, then POI points using the addition or subtraction from the given altitude of the first waypoint.
(Now here's the stuff)
-At each waypoint I choose the gimbal action POI and choose the numbered POI from the drop down. This will let Litchi select the proper aircraft and gimbal angles. Then toggle the action from POI back to Interpolate. It will leave the angles in place but now use an interpolate function at the waypoint. Leaving it on POI simply would not work in the past. I have kept this practice because I am used to it. I understand now, my method should be obsolete as, correct me if I'm wrong, POI is suppose to smoothly yaw the aircraft and gimbal angles as it moves from point to point?

NOTE- if you try my technique, you need to change all the points. Interpolate only works if the waypoint before/after it are also set to interpolate.

Litchi needs to be connected to the RC in order to control the gimbal while using POI mode. In POI mode, the RC controls the gimbal in real time. If you set the mission up the way I described before (changing all waypoint actions from POI to Interpolate- it can be done as the very last step of your route plan) the gimbal angles are uploaded at the start of the mission and will work even when the RC loses communication.

Read carefully "Gimbal Pitch". While it isn't crystal clear you can see that using interpolate, the aircraft gets the commands at the onset of the mission.

Space Man · Feb 25, 2019

@BD0G thank you. I am going to try following those steps... see if that yields a different result.

BD0G · Feb 25, 2019

Welcome! Once you get a workflow down that works it will be easier to follow it every time.

Space Man · Feb 25, 2019

@BD0G thanks, that helps. I will also make sure to put some really "basic" flight bits in missions... so that I still get usable footage. Lesson learned.

Prismatic · Feb 25, 2019

BD0G said:
... I understand now, my method should be obsolete as, correct me if I'm wrong, POI is suppose to smoothly yaw the aircraft and gimbal angles as it moves from point to point? ...

You are not wrong. Both yaw and gimbal are now correctly handled by Litchi.

I often fly missions with a half-dozen POIs and 30+ waypoints. Centering the POI rarely results in ideal framing in my view, so if the gimbal angle isn’t what I prefer—typically too much sky for a near ground POI—I’ll set a negative POI altitude. This automatically adjusts the gimbal of all waypoints that use the POI, which is almost always what I want.

Bill Ludwig · Feb 25, 2019

Don’t know if you already are using this, but Virtual Litchi Mission is a lifesaver when you’re setting up missions in Mission Hub...
Virtual Litchi Mission

Prismatic · Feb 25, 2019

Space Man said:
I am a NEW drone owner.

A bit rash, to fly from a small craft. Many drones wind up in the drink that way, most commonly those under the control of inexperienced pilots. But all’s well that ends well! Thumbswayup

I guess.

I ... installed Litchi on my CrystalSky. ... I planned my first automated flight yesterday via the mission hub, with 2 POIs and a couple of waypoints. Somehow the drone didn't focus on the second POI, or it was offset somehow. Any ideas?

As far as I can see, your drone flew the mission perfectly. I can spot exactly where in the flight the drone switches POIs just by watching the video. I can’t guess what issue you think you had, so can’t offer help.

BD0G · Feb 25, 2019

He was trying to manuver the boat into the center area of his mission and selected that as POI #2 . When the Mavic circled that area then the boat was not centered. It may have been that the POI #2 and the location of the boat were not in the exact spot.

One could drive the boat out to a specific spot and then determine its exact GPS coordinates -Lattitude and Logitude and then use those within Lichti to set the POI. That probably takes more time and work than the OP is willing to devote.