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Permalink Reply by Johann Van Niekerk on January 10, 2011 at 2:45pm

Wow sandro only caught what you said now ...Great how are you going to do  that ? no PTP ? thought that ment no worky?

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DeveloperPermalink Reply by Sandro Benigno on January 10, 2011 at 2:59pm

It will be PTP, just not the default command-set from canon. Probably, the ArduCam will just call a single command inside the CHDK PTP. That command will be sent with arguments that tells the Lua script how to drive the cam.

Permalink Reply by Johann Van Niekerk on January 10, 2011 at 3:03pm

Just shutter control at first I take it ?  then zoom...

Great work Sandro.

Permalink Reply by Robert Godlewski on January 10, 2011 at 3:09pm

Wouldn't it be possible to solder on a wire to the trigger circuit under the trigger button and pass a current to it at a determined frequency? I mean isn't that what the trigger button actually does - when pressed doesn't it close the circuit so that some voltage can get through and activate the shutter? That's what I'm thinking of doing once I finish building my Raven RQ-11. 

 

If you do indeed try this, let me know how it goes!

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Permalink Reply by Johann Van Niekerk on January 10, 2011 at 3:16pm

Robert

I have tried it Robert and R.I.P i use to fix cameras back in colledge and know what to look for and i still managed to kill a brand new camera . STAY AWAY. if the Flash Capasitor doesnt shock you the horrer of putting the camera back togeher and relizing that it doesnt want to switch on..... means that some chips was static sensitive and your hands blow it will ! if you keen on trying it try to get a very old camera that might stil have a chance of having a normal open circuit button!

Regards

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Permalink Reply by Robert Godlewski on January 10, 2011 at 3:24pm

Hmmm... did you supply the right voltage and for the right amount of time? 

 

I don't have any experience fixing cameras but I'm having trouble seeing how this wouldn't work.

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Permalink Reply by Johann Van Niekerk on January 10, 2011 at 3:29pm

thats the point

Robert you wont get to the stage where you ready to supply current/volatge. most of these new camera's the parts doesnt get soldered on even gets "hot aired" on so you will be lucky just to get a soldering tip in there  .

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DistributorPermalink Reply by Martint BuildYourOwnDrone.co.uk on January 10, 2011 at 3:29pm

How about an "old school" system, servo in the place of your thumb?

 

 

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Permalink Reply by Ron Skingley on January 11, 2011 at 12:58am

Yes, Johann is exactly right.

The chips used in cameras are very low current, and very low voltage, which means nearly everything in there is high impedance.

Even the 'switch' inputs take anything less than about 50k as being 'on'. So even if you just go near them you can blow things up.

You have to ground yourself, the camera, your tools, everything, and even then you can blow things.

 

Just as an exercise, try taking a digital watch apart.

You will find there's no actual direct connection between the circuit board and the display. It's done with small 'vertical' carbon fibres - like a tightly packed brush or mat, and the components are just dropped together in the factory.

 

Soldering, like Johann says, is done with hot air.

(A bit like politicians - Oops sorry)

 

For my money, and with this camera, it will have to be a 'mechanical thumb'.

 

Ron

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