KAP & UAV Exposure Control Intervalometer Script - page 81 - Completed and Working Scripts - CHDK Forum
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KAP & UAV Exposure Control Intervalometer Script

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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #800 on: 08 / April / 2016, 09:34:36 »
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Quote from: CharlieR on 07 / April / 2016, 03:14:29
Yep - the next release of Copter (3.3.4) will support triggering of a log message via the hotshoe of a camera so will probably look in that direction. I guess that feature could be adapted to use a photoresistor and the flash sync LED.
I don't think any Canon P&S cameras have a "flash sync" LED  (i.e. an LED that fires at the exact moment the shutter opens for sync with an external flash).

For cameras with a hotshoe (G series mostly??) the ability to detect the flash trigger signal from a flight controller should be quite accurate - assuming the camera can be configured to actually fire the flash in a bright outdoor lighting situation (and not have exposure issues when there is no actual flash). 

For other CHDK P&S cameras,  the ability to activate the "focus assist" LED via the kap_uav.lua script should be a pretty good option if a phototransistor can be interfaced to the flight controller.



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Offline lanzo

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #801 on: 13 / April / 2016, 11:00:20 »
Quote from: waterwingz on 31 / March / 2016, 22:45:59
So,  because I am evil,  I will point out that you are using the USB "OneShot" mode with your Pixhawk UAV.  Which limits you to about one shot every 2 seconds (at best). 

But your Pixhawk and CHDK can get down to 2 shots per seconds!  Depending on what you are doing,  that may not matter.   But if you get to the point when you want to shoot that fast,  check back here?

I'm back!
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Offline CharlieR

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #802 on: 14 / April / 2016, 04:34:02 »
Just a quick report, I have had some success with accurate geotags using the KAP log time stamps - the time stamping is accurate enough to be useful in combination with post processed RTK GPS data, I have achieved sub metre precision, with the majority of tags within 30cm of the calculated image positions using Pix4d. This is the limit of accuracy of the GPS system at the moment, bu with more accurate position data clock syncing between GPS becomes even more of an issue.

Unfortunately the S100 GPS clock sync is not accurate enough - I have had to use trial and error to discover an offset which works for a given project, not impossible but time consuming.

I guess the S100 internal clock received GPStime, applies the UTC offset and rounds to the nearst second at some point? A shame as it clearly could get an accurate sync in terms of hardware...
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Offline netptl39

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #803 on: 14 / April / 2016, 09:55:41 »
@wwz
Sorry for missing out on the fun here!


Can the Canon EOS M3 run the KAP script by default?
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Offline waterwingz

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KAP & UAV Exposure Control Intervalometer Script
« Reply #804 on: 14 / April / 2016, 10:18:54 »
Quote from: netptl39 on 14 / April / 2016, 09:55:41
Can the Canon EOS M3 run the KAP script by default?
Based on what reyalp reported in the EOS M3 porting thread, the M3 port is incomplete and doesn't support exposure adjustment.  So the value of the kap_uav.lua script would not be much at that point.

Quote
EOS M3 porting
I looked at the existing source a some more and it's less complete than I initially thought. capt_seq was not implemented at all, and it uses propset6 with no modifications. This means that essentially no shooting functions will work.
« Last Edit: 14 / April / 2016, 10:22:28 by waterwingz »
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Offline lanzo

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #805 on: 14 / April / 2016, 17:52:13 »
Quote from: CharlieR on 14 / April / 2016, 04:34:02
Just a quick report, I have had some success with accurate geotags using the KAP log time stamps - the time stamping is accurate enough to be useful in combination with post processed RTK GPS data, I have achieved sub metre precision, with the majority of tags within 30cm of the calculated image positions using Pix4d. This is the limit of accuracy of the GPS system at the moment, bu with more accurate position data clock syncing between GPS becomes even more of an issue.

Unfortunately the S100 GPS clock sync is not accurate enough - I have had to use trial and error to discover an offset which works for a given project, not impossible but time consuming.

I guess the S100 internal clock received GPStime, applies the UTC offset and rounds to the nearst second at some point? A shame as it clearly could get an accurate sync in terms of hardware...

Does the time wrote by the script differs from the time wrote by the camera in the exif of the photo?
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #806 on: 14 / April / 2016, 21:02:11 »
Quote from: lanzo on 14 / April / 2016, 17:52:13
Does the time wrote by the script differs from the time wrote by the camera in the exif of the photo?
I would be amazed if the two times were different.  But understand that the script log resolution is better than 0.01 Sec - the exif info is usually only in increments of one second.
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Offline CharlieR

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #807 on: 15 / April / 2016, 06:45:26 »
The shutter release times in the KAP log are very accurate as far as I can tell - I have improved the post procesing of my gps logs to a precision of a few cm and to reduce the offset beween computed and reported image positions in Pix4d to the point that the largest error is the offset in height between the GPS anetnna and the camera sensor (around 10cm).

If there was a way of getting the GPS time into the KAP log with an accurate time stamp from the S100 clock or something it would be fairly easy to achieve GCP free mapping using this method.

autofocus led with a phototransistor looks the best bet for an accurate sync otherwise.

continue to be very impressed with chdk and the kap script  :D
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Offline netptl39

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #808 on: 15 / April / 2016, 09:07:29 »
@WWZ,
I am a little puzzled as my S110 with Pixhawk + Burst does not wait for trigger signal on each photo but rather at the first signal  it starts shooting and it does not stop until it freezes and goes dead.
Most probably I messed up a setting somewhere working on the new interface, but I have no idea where.
can you please help?
I am still using the 3.6b15.   :-[
« Last Edit: 15 / April / 2016, 09:16:24 by netptl39 »
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #809 on: 15 / April / 2016, 09:36:39 »
Quote from: netptl39 on 15 / April / 2016, 09:07:29
Most probably I messed up a setting somewhere working on the new interface, but I have no idea where.
Please post your most recent log file as an attachment here.
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