Mapper905
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Copter pauses during Auto flight

Started this discussion. Last reply by Andre K. Apr 9. 1 Reply

We have several DJI S900's using Pixhawks, and in the past couple of months, we've noticed the copter "pausing", or at least wide swings in speed from the planned speed. This seems coupled with the…Continue

Tags: breach, fence, failsafe, altitude

ATT dataflash messages: "desired" attitude vs attitude

Started this discussion. Last reply by Mapper905 Jan 13, 2016. 3 Replies

Can someone explain "Desired Roll" vs. "Roll"?I have an unexplained crash that occurred at the end of a long autonomous flight.  Suggestion in the manual on log file analysis indicates differences…Continue

Exposure rate limitations

Started this discussion. Last reply by AndyC Sep 20, 2014. 12 Replies

I can't seem to get my S100 to take pictures much faster than an expourse every two seconds or so. I'm using the "trigger by distance" method to trigger from the autopilot. I think I've disabled all…Continue

 

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Latest Activity

Andre K. replied to Mapper905's discussion Copter pauses during Auto flight
"IMU Mismatch: FAIL Check vibration or accelerometer calibration. (Mismatch: 3.29, WARN: 0.75, FAIL: 1.50) Motor Balance: FAIL Motor channel averages = [1532, 1544, 1520, 1559, 1539, 1537, 1734] [GRAPH] Average motor output = 1566 Difference…"
Apr 9
Mapper905 posted a discussion

Copter pauses during Auto flight

We have several DJI S900's using Pixhawks, and in the past couple of months, we've noticed the copter "pausing", or at least wide swings in speed from the planned speed. This seems coupled with the inability to hold the planned altitude very well.  Anyone else seen this, or know why this might be occurring? I'm attaching a sample log. Vibration levels seem reasonable. This flight breached the altitude fence (10m higher than mission alt) and also tipped over on landing doing a good bit of damage.See More
Feb 2
Mapper905 replied to Mapper905's discussion ATT dataflash messages: "desired" attitude vs attitude
"Thanks, Anthony, for the response. The copter is well below it's max weight, has been through the auto-tune process, and flies with very good stability and precision.  And yes, the small perturbations in roll you identified are waypoints.…"
Jan 13, 2016
Anthony Kirk replied to Mapper905's discussion ATT dataflash messages: "desired" attitude vs attitude
"Desired Roll is what the Flight controller wants the copter to do.  Roll is what the copter is actually doing. If there is a discrepancy between the two (amusing the PID are correct and the copter power to weight ratio is OK), this indicated…"
Jan 12, 2016
3D Hex replied to Mapper905's discussion ATT dataflash messages: "desired" attitude vs attitude
"Bump. I am curious for some sort of explanation to this as well...."
Jan 11, 2016
Mapper905 posted a discussion

ATT dataflash messages: "desired" attitude vs attitude

Can someone explain "Desired Roll" vs. "Roll"?I have an unexplained crash that occurred at the end of a long autonomous flight.  Suggestion in the manual on log file analysis indicates differences between desired and actual values might point to a mechanical failure. However, that doesn't appear to be the case in an s900 hex crash with a pixhawk. I notice the desired roll becomes quite large (positive) and large oscillations occur around the roll axis. Is this a failure of the algorithm…See More
Jan 7, 2016
Mapper905 replied to Randy's discussion Copter-3.3 beta testing
"After installing 3.3.1, I noticed a couple of PID values changed: RATE_RLL_IMAX & RATE_PIT_IMAX to 2000 from the earlier 1000 setting.  Did the PID loops change such that what was 1000 on 3.2.1 needs to be 2000 to behave the same…"
Nov 6, 2015
Mapper905 posted a discussion

Interpreting (or misinterpreting) Pixhawk telemetry?

Attempts to fly my s900 with pixhawk have resulted in tip-overs multiple times now. This is happening after an upgrade to 3.3.1.  After fixing damage from yesterday, I tried a simple test today. In stabilize, I got the copter a little light on the skids, then gave a brief left roll input (C1).  The plot of desired roll &…See More
Nov 5, 2015
Mapper905 replied to Corey O's discussion Mounting a S100 cannon camera on my drone
"@David - I just ran the numbers thru Mission Planner:  With the 20mm lens at 50m, for 80% forward-lap, you need a photo every 12m.  My Skywalker 2014 is on the slow end of it's range at 10m/s, so that's every 1.2 seconds. That…"
Sep 22, 2014
Mapper905 posted a status
"NEX-5 users: can you trigger from autopilot via IR remote at 1 frame/sec or better?"
Sep 21, 2014
Mapper905 replied to Corey O's discussion Mounting a S100 cannon camera on my drone
"At what rate can you trigger the NEX-5?  My S100 is less than 1 frame/2 sec.  Is the NEX-5 significantly faster? Thx."
Sep 21, 2014
AndyC replied to Mapper905's discussion Exposure rate limitations
"Have you checked whether this works? (If you point the camera at a close subject does it ignore your override and refocus?) I've tried using the CHDK menu to set the focus to infinity, but the autofocus overrides this and refocuses before each…"
Sep 20, 2014
Rami Kopelman replied to Mapper905's discussion Exposure rate limitations
"I lock the focus on infinity, I have this option in the CHDK menu."
Sep 20, 2014
AndyC replied to Mapper905's discussion Exposure rate limitations
"Thanks, presumably that using CHDKs native support for USB triggering rather than a script. Have you managed to lock the focus, it seems a lot of people (including me) are struggling to do this with the SX260HS in particular when running CHDK."
Sep 19, 2014
Rami Kopelman replied to Mapper905's discussion Exposure rate limitations
"I use shutter priority (Tv)"
Sep 19, 2014
Rami Kopelman replied to Mapper905's discussion Exposure rate limitations
"I am not connecting the camera to the APM at all. I just use the intervalometer function of the chdk."
Sep 19, 2014

Profile Information

About Me:
RC heli and fixed-wing pilot. Software developer for mapping industry.
Please tell us a bit about your UAV interest
UAVs for survey and mapping
Hometown:
Madison, AL

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