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CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD

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Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #40 on: 21 / October / 2012, 14:46:01 »
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I see // how long ago ? // these folks are not around anymore ??
Some history here if you scroll down a couple of pages :  http://tinyurl.com/9cujp5h
Ported :   A1200    SD940   G10    Powershot N    G16

Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #41 on: 21 / October / 2012, 15:26:13 »

I must have missed something ?  Where's the mystery ?

Who is VitalyB, we know who GrAnd and a number of the other early contributors are ?

Quote
http://chdk.setepontos.com/index.php?topic=65.0

Remarkably similar to my original work :-

http://stereo.jpn.org/eng/sdm/chdk.htm

Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #42 on: 21 / October / 2012, 15:30:11 »
Remarkably similar to my original work :-
http://stereo.jpn.org/eng/sdm/chdk.htm
What ?  People actually copy stuff without crediting the original author(s) ?  Imagine that.
« Last Edit: 21 / October / 2012, 15:33:01 by waterwingz »
Ported :   A1200    SD940   G10    Powershot N    G16

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Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #43 on: 21 / October / 2012, 16:29:01 »
Nice walk down history lane.

@waterwingz
When did you get involved in the development of CHDK ?

@Microfunguy
Traveling down some of the grape vines, I see your contributions go back at least to 2007 ??


Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #44 on: 21 / October / 2012, 16:38:45 »
@waterwingz
When did you get involved in the development of CHDK ?
I'm a newbie.
http://chdk.wikia.com/wiki/User:Waterwingz
Ported :   A1200    SD940   G10    Powershot N    G16

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Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #45 on: 24 / October / 2012, 17:03:00 »
A TECHNICAL NOTE on OVERRIDING BARREL CORRECTION with Canon NATIVE CR2s

Under normal shooting conditions when you set the lens to full wide angle JPGs are barrel-corrected in the camera.  When you shoot the corresponding Canon native CR2, it is not barrel-corrected in the camera (but camera barrel correction is always applied to the EXIF JPEG thumbnail by the camera).  When using a PFP setup as described here and you shoot a native CR2, if you set zoom to full wide angle, when Canon PC software decodes a CR2 shot at full wide angle it applies barrel correction before displaying the decoded image.  Without a lens of course, this causes undesired morphological distortion of the raw image.  Options are to use DNGs (or CR2s) and view them in RAWTherapee.  However, viewing native CR2s in Canon software may be more convenient and they are typically 2/3 the size of DNGs.  To prevent Canon PC software from applying barrel correction, set your optical zoom to maximum before shooting.  I validated this by observing the morphological difference between the JPG and the native CR2 after decoding in RAWTherapee, and there is none.  In contrast, when the lens is set to full wide angle, there is a very big morphological difference between the JPG and CR2 after decoding in RAWTherapee.
« Last Edit: 29 / October / 2012, 10:35:36 by SticK »

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Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #46 on: 01 / November / 2012, 16:08:29 »
AN ACTUAL SHUTTER CONTROLLER IMPLEMENTATION     Post 1 of 2

Please read this first:
http://chdk.setepontos.com/index.php?topic=8801.msg92280#msg92280
The S90 shutter pulses are actually composed of a high-speed 100 kHz pulse train for the duration of the open or close energization.  This is not typical of external shutters which need a solid energization pulse.  Thus a new mod was added to disarm retriggering the timers when additional pulses of the same polarity follow the initial trigger until an opposite polarity trigger has occurred.  This means that the controller cleans up the input energization pulse, while allowing a shorter or longer solid energization pulse at the output.  That has been added in V2 rev 7 above.  So you can use either V4 below which adds an auxiliary input, or the simplified V2.

These are the specific components needed.  Other resistors and capacitors are your own choice.
BOM - DigiKey
1X  296-1187-1-ND   SN74HC00DR   IC QUAD 2-INPUT NAND GATE 14SOIC
1X  296-1188-1-ND   SN74HC02DR   IC QUAD 2-INPUT NOR GATE 14-SOIC
1X  SI9986DY-T1-E3CT-ND   SI9986DY-T1-E3   IC BUFFERED H-BRIDGE 8-SOIC
2X  TLP2160(F)-ND TLP2160(F)     ISOLATOR 2.5KVRMS 2CH TOTEM SO8
1X  296-17360-1-ND   LP2981-33DBVR   IC REG LDO 3.3V .1A SOT23-5
2X  SM-42TW204CT-ND   SM-42TW204   TRIMMER 200K OHM 0.25W SMD (11 turn SMD)
2X  LMC555CMXTR-ND      LMC555CMX/NOPB    IC OSC MONO TIMING 3MHZ 8-SOIC
2X  478-1239-1-ND   0603YC104KAT2A   CAP CER 0.1UF 16V 10% X7R 0603
3X  DB2J31000LCT-ND   DB2J31000L   DIODE SCHOTTKY 30V 200MA SMINI2
1X  718-1623-1-ND                       CAP TANT 100uF 16V 10% 2917 (could be any that fits)

BOM - Mouser
2X  Schmartboard 204-0004-01

NOTES

On the board itself, I swapped the positions of the shutter and AUX input optoisolators.  Wiring is otherwise same.  PUP the controller first then the camera.  Initialize the controller by going to REC, PLAY and then REC mode again.  Connectors and pins clockwise from lower left:
  a) AUX input (OPEN, COMMON, CLOSE)
  b) camera shutter signal from main board
  c) Power 4V to 13V (GND +)
  d) shutter drive output
  e) Lamp enable (GND, OUT)
« Last Edit: 02 / November / 2012, 02:29:25 by SticK »

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Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #47 on: 01 / November / 2012, 16:30:15 »
AN ACTUAL SHUTTER CONTROLLER IMPLEMENTATION     Post 2 of 2

To test the circuit, I set the OPEN and CLOSE pulse widths to 1.3 and 6.1 ms, inserted the controller between the main board shutter signal and the shutter solenoid, and set Vin to its required +5V.  In the figures the shutter vanes were removed but the solenoid armature is visible in the yellow ellipse.  I marked the armature by a red dot.  Movement is approximately 1 mm.

Figure 1 is the shutter OPEN state with iris at full f2, and figure 2 is shutter CLOSED with iris stopped down to f5.6.  This shoot command via CHDKPTP was Tv 4 seconds to allow me to snap figure 2 while the camera was acquiring the dark.  The rest of the camera is underneath the lens components and controller.

A very good 10 mm clear aperture PFP CCD shutter candidate suitable for driving with this implementation is:
http://www.uniblitz.com/product.aspx?productName=DSS10&housing=B1&bfID=1&mount=&so=&hto=&tab=0
http://www.uniblitz.com/resources_filelibrary/DSS10-Datasheet.pdf

You can mount your PFP camera easily to your telescope by securing it by the gutted lens assembly as I explained in an earlier post (empty housing when fastened to camera, right).  In summary, it is evident that the S90 CCD, this controller, a Uniblitz DSS10 shutter and CHDKPTP are formidable combination for PTP-configured telescopes. 
« Last Edit: 02 / November / 2012, 02:30:58 by SticK »


Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #48 on: 01 / November / 2012, 18:49:50 »
i appreciate the Multiblitz shutter is very compact but it is rather expensive .. in my opinion.

Anyway, there are alternatives.

It needs 12V of course.


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Re: CHDKPTP: S90 Primary Focal Plane Configuration - hacking out the CCD
« Reply #49 on: 01 / November / 2012, 19:25:17 »
There isn't a big choice for off-the-shelf 10+ mm shutters unfortunately.  Even solenoids to build-your-own, from another source I researched, range from $450 to $650.  The Uniblitz engineer told me their driver for the DSS10 outputs 10.7V and it does switch within time spec no problem.  Since the camera solenoid runs on 5V, that what I set the power supply for the test.  You can feed the controller up to 13V max. 

Look forward to my updating these posts over next several days as I fine tune the performance and understand operation better.
« Last Edit: 02 / November / 2012, 02:33:09 by SticK »

 

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