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INDI Library v1.9.8 Released (29 Sep 2022)

Bi-monthly INDI Library released with new drivers and bug fixes.

Download time equal to exposure (classic QHY-5)

  • Posts: 20
  • Thank you received: 3
Dear everyone.

I'm having some trouble with and old QHY5 that I would like to use as an all-sky camera. I have been able to connect it through INDI both using Ekos and even with some python scripting. However I have a problem: If I do an exposure of X seconds the download time is X + e, being e a slow delay (which is understandable). For example, if I set an exposure of 10 seconds, the exposure counter takes the 10 seconds of the exposure and then about 11 seconds in which the image is supposedly downloading.

I have seen in other forums that this happened with other QHY cameras:

www.qhyccd.com/bbs/index.php?topic=7506.0

I have tested it connecting the camera in a raspberry pi (and the client in other computer) and connecting the camera in the same computer (therefore it is not a problem of the network connection). Using different software (for example PHD2 under linux) the camera takes the exposures with almost no delay. From what I have read it may be an error of the camera skipping the first frame when it is connected or something like that (and maybe the INDI driver reconnects to the camera each time that an exposure must be taken?).

Anyone has any similar problem? I know it is an old camera but I really would like it to use it. Any hints?

Thank you for your attention
2 years 2 months ago #60865

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  • Posts: 1
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Hello,

I am a collaborator of the project that Zerjillo says, as he has commented, it seems that time is always double the exposition time. It seems that time is wasted reading from the usb.

Attached the log using 5 seconds as the exposition time:
INFO	235.059428 sec	: Session log file /home/ainokila/.indi/logs/2020-10-01/indi_qhy_ccd/indi_qhy_ccd_17:03:21.log
DEBUG	247.092961 sec	: Requested exposure time is 5000000 us
DEBUG	247.092995 sec	: QHYCCD|QHYCCD.CPP|SetQHYCCDBinMode|START
DEBUG	247.414244 sec	: QHYCCD|QHYCCD.CPP|SetQHYCCDBinMode|END   ret = 0
DEBUG	247.414274 sec	: SetQHYCCDBinMode (1x1).
DEBUG	247.414295 sec	: QHYCCD|QHYCCD.CPP|SetQHYCCDResolution|SetQHYCCDResolution|x = 0 y = 0 xsize = 1280 ysize = 1024
DEBUG	247.414308 sec	: QHYCCD|QHYCCD.CPP|SetQHYCCDResolution|END   ret = 0
DEBUG	247.414315 sec	: SetQHYCCDResolution x: 0 y: 0 w: 1280 h: 1024
DEBUG	247.414322 sec	: QHYCCD|QHYCCD.CPP|ExpQHYCCDSingleFrame (BeginSingleExposure) | START
DEBUG	247.414331 sec	: QHYCCD| QHY5.CPP | BeginSingleExposure
DEBUG	247.414336 sec	: QHYCCD| QHY5.CPP | Call setParameters camgain 10
DEBUG	247.735656 sec	: QHYCCD|QHYBASE.H|StartRemainingTimesCount
DEBUG	247.735686 sec	: QHYCCD|QHYCCD.CPP|ExpQHYCCDSingleFrame (BeginSingleExposure) | return value=8193
DEBUG	247.735714 sec	: Taking a 5.00000 seconds frame...
DEBUG	252.738295 sec	: GetQHYCCDSingleFrame Blocking read call.
DEBUG	252.738363 sec	: QHYCCD|QHYBASE.H|StopRemainingTimesCount
DEBUG	252.738387 sec	: QHYCCD|QHYCCD.CPP|GetQHYCCDSingleFrameInternal| #1 readnum,badframenum,ret 0 0 -1
DEBUG	252.738416 sec	: QHYCCD|QHYCCD.CPP|GetQHYCCDSingleFrameInternal| #1 flagquit 0
DEBUG	252.738439 sec	: QHYCCD|QHYCCD.CPP|GetQHYCCDSingleFrameInternal|Enter While Loop
DEBUG	252.738461 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | Begin 
DEBUG	252.738479 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | pW pH pBpp pChannels 1280 1024 8 1
DEBUG	252.738504 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | vendRXD 0x12 (set exposure) 5000
DEBUG	252.805366 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | readUSB2B start
DEBUG	252.806049 sec	: QHYCCD|QHYCAM.CPP|readUSB2B|readUSB2B p_size=1600200 p_num=1
DEBUG	252.806064 sec	: QHYCCD|QHYCAM.CPP|readUSB2B|i=0
DEBUG	257.913193 sec	: QHYCCD|QHYCAM.CPP|readUSB2B|Finished
DEBUG	257.913289 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | readUSB2B end
DEBUG	257.913663 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | roi end
DEBUG	257.914027 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | memcpy end
DEBUG	257.914056 sec	: QHYCCD| QHY5.CPP | GetSingleFrame | End
DEBUG	257.914077 sec	: QHYCCD|QHYCCD.CPP|GetQHYCCDSingleFrameInternal| #2 readnum = 1 badframenum = 0 flagquit = 0
DEBUG	257.914111 sec	: QHYCCD|QHYCCD.CPP|GetQHYCCDSingleFrameInternal|ret w h bpp channels 0 1280 1024 8 1
DEBUG	257.914140 sec	: QHYCCD|QHYCCD.CPP|GetQHYCCDSingleFrameInternal|END
DEBUG	257.914160 sec	: GetQHYCCDSingleFrame Blocking read call complete.
DEBUG	257.914178 sec	: Download complete.
WARNING	257.914477 sec	: Telescope focal length is missing.
WARNING	257.914523 sec	: Telescope aperture is missing.
DEBUG	257.915007 sec	: Uploading file. Ext: fits, Size: 1316160, sendImage? Yes, saveImage? No
DEBUG	257.921288 sec	: BLOB transfer took 0.00623192 seconds
DEBUG	257.921325 sec	: Upload complete

Thanks!
2 years 1 month ago #60942

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The issue is in the SDK, it's better to contact QHY about this with the logs.
Jasem Mutlaq
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How to Submit Logs when you have problems?
Add your observatory info
2 years 1 month ago #60998

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indilib.org/forum/ccds-dslrs/4135-qhysdk....html?start=12#32357

That was in 2018, the problem exists for years. Regarding help from QHY I wouldn't hold my breath.
Last edit: 2 years 1 month ago by Alfred.
2 years 1 month ago #61008

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