building usb-remote-cable - page 18 - Hotwire! Hardware Mods, Accessories and Insights - CHDK Forum
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building usb-remote-cable

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Offline eylon

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Re: building usb-remote-cable
« Reply #170 on: 24 / December / 2008, 11:02:55 »
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Does anyone know the pins to power in order to release the shutter on a G5? This would be a great help. I am aware that CHDK does not run on the G5 however I have had success using a cable release on the G9 without CHDK. I presume that the G5 would be the same. I have tried my usb cable release on my G9 and SD850 and it works well.  When I use this cable release on a friends G5 it switches between record and review modes. Thanks!
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Offline Microfunguy

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Re: building usb-remote-cable
« Reply #171 on: 24 / December / 2008, 11:30:04 »
Quote from: eylon on 24 / December / 2008, 11:02:55
I have had success using a cable release on the G9 without CHDK.
Hmmm .... I have never heard of that before.

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When I use this cable release on a friends G5 it switches between record and review modes.

If you connect a USB cable from the camera to the PC, does it switch to playback mode and start a Canon programme to upload your images  ?

In CHDK, we prevent that from happening when USB Remote is enabled.


David
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Offline eylon

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Re: building usb-remote-cable
« Reply #172 on: 24 / December / 2008, 13:30:44 »
Sorry... Let me correct the previous post. I just retried the cable release on the G9 without CDHK running. David you are correct. It does not release the shutter it just switches to review mode, while the pushbutton is pressed, once it is released it returns to record mode.

If I understand you correctly by connecting the camera to a computer, the computer automatically switches the camera to review. Thus their is no foreseeable way to have a cable release work without CHDK.



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Offline Microfunguy

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Re: building usb-remote-cable
« Reply #173 on: 24 / December / 2008, 14:31:22 »
Quote from: eylon on 24 / December / 2008, 13:30:44
by connecting the camera to a computer, the computer automatically switches the camera to review.

When +5V is connected to the USB, a signal goes to the DIGIC chip and the firmware sets a particular location in memory to indicate the +5V is present.
The Canon firmware switches to playback mode and tries to communicate with the PC when it sees that memory location is set to '1'.
Your computer may respond to the camera communication by starting a designated programme.
That programme may be Canon ZoomBrowser or it may be any other designated programme.
Now, to use a USB remote we need to stop all of this from happening.
When menu option 'USB Remote' is enabled, we set that memory location back to '0' one hundred times a second, so the Canon firmware never knows the USB is connected and does not switch to playback mode.

Quote

 Thus their is no foreseeable way to have a cable release work without CHDK.


No   :(
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Offline dom-a

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Re: building usb-remote-cable
« Reply #174 on: 28 / December / 2008, 12:13:56 »


1x piece of stripe board.
2x cr2032 3v batteries.
1x toggle switch.
2x cr2032 holders.
1x push to close switch.
1x voltage regulator.
1x box.
1x cable.
1x led.
1x resister.
1x bunch of wire and solder.

The toggle switch arms it. The LED shows that its armed and the big red button takes pics.
« Last Edit: 28 / December / 2008, 12:15:37 by dom-a »
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Offline mastersvaulter

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Re: building usb-remote-cable
« Reply #175 on: 30 / December / 2008, 23:42:11 »
Hello,  I'm hoping someone can help with a problem with my implementation of a usb-remote-cable.  I am trying to do this on an S2-IS.  I have connected a usb cable, momentarily switched my 4.5V source to provide power to pin 1 of the usb cable.  This initiates the taking of a picture (as determined by what happens on my display and what sounds the camera makes.)  The problem is no image data is written to the card.  The script I'm using is shown below.   The CHDK version is 0.8.7 609   The camera firmware is 1.00e.

Code: [Select]
@title Remote button
 :loop
 wait_click
 is_key k "remote"
 if k=1 then "shoot_full"
 goto "loop"
 end
MODIFICATION:
After reading and experimenting more, it would appear my camera was not taking a photo but instead was just switching into "playback" mode momentarily and then back.  (that is what I thought was "taking a photo")  I then tried this script:

Code: [Select]
@title Remote button
while 1
  wait_click 1
  if is_key "remote" then shoot
wend

end
...and the camera did the same mode switch but after that it actually took a photo also.  Yeah... some progress.  I then read a post in which David said:
 
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When menu option 'USB Remote' is enabled, we set that memory location back to '0' one hundred times a second, so the Canon firmware never knows the USB is connected and does not switch to playback mode.

I tried that (at least I think I did... Miscellaneous stuff -> Remote Parameters -> Enable Remote *) but unfortunately it did not seem to help with the mode switching on my camera.  Is it supposed to work with all CHDK versions?

Any help would be much appreciated.
« Last Edit: 31 / December / 2008, 03:50:04 by mastersvaulter »
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Offline tranalbert

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Re: building usb-remote-cable
« Reply #176 on: 31 / December / 2008, 00:04:50 »
Does any one know the Minimum USB-Remote Volts for the 590IS? Thanks
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Offline dom-a

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Re: building usb-remote-cable
« Reply #177 on: 31 / December / 2008, 11:44:14 »
Quote from: tranalbert on 31 / December / 2008, 00:04:50
Does any one know the Minimum USB-Remote Volts for the 590IS? Thanks

My a570 IS triggers with 3.6 volts. But I find you have to have synch mode on in the remote setting for it to work, the first press meters and focuses and the second takes the pic. Unless you use manual focus.
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Offline Microfunguy

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Re: building usb-remote-cable
« Reply #178 on: 31 / December / 2008, 12:29:27 »
Quote from: mastersvaulter on 30 / December / 2008, 23:42:11
Is it supposed to work with all CHDK versions?


I could not get it working with SDM,  I gave up.


David
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Offline mastersvaulter

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Re: building usb-remote-cable
« Reply #179 on: 31 / December / 2008, 18:59:02 »
Quote from: Microfunguy on 31 / December / 2008, 12:29:27
Quote from: mastersvaulter on 30 / December / 2008, 23:42:11
Is it supposed to work with all CHDK versions?


I could not get it working with SDM,  I gave up.


David

Thanks for your reply.  I just downloaded and installed "s2is-100e-0.9.0-660-full".  I then tried the remote button script again.  The new version didn't help.  It still does a change to playback mode, then returns, then takes the photo.

Is doing this:
Menu -> Miscellaneous stuff -> Remote Parameters -> Enable Remote *
what you mean by enabling menu option 'USB Remote'?  What else could I be doing wrong or not doing when I need to do it?  Must the camera be in a particular mode for taking the photo?  It would seem that the portion of CHDK that is supposed to
Quote
... set that memory location back to '0' one hundred times a second, so the Canon firmware never knows the USB is connected and does not switch to playback mode.
is not doing that on my camera.

- John
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