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Trying to run my sony Cybershot from an external 12V supply. Need help Answered


Background:

I am currently trying to build a housing that will turn my Sony DSC W-55 Cybershot Camera into a time lapse camera (Automatically take a photo every X Seconds for an extended period of time).

I have already built the enclosure that houses the camera, circuit board and actuator that presses the shutter release button ever 15sec. (Adjustable). Pictures below

Problem:

I Need to run the camera for very long periods of time (current baseline is >8hr, but indefinately would be nice). The camera uses a Sony G-Type Li-Ion Battery that does not provide the runtime I need for this application, so I am trying to hook the camera up to an external supply. The battery has three terminals as follows

[+] = ~3.9V    (No surprise here)
[C] = 3V         (This is weird)
[-]  = 0V

I accepted that the extra terminal was strange, but figured it would not be hard to simulate.

I used an LM317 Adj. Voltage regulator to simulate the 3.7V [+] Terminal and a voltage divider off of the 3.7V bus to get the 3V required for the [C] terminal. I double checked everything and plugged it in with no success, the camera will not turn on.

My question is, what smarts are in the battery that I need to simulate, or is there something wrong with my current set-up. Any help will be appreciated.

Thanks,

John

Discussions

Have you tried it without the 3V terminal. The thermistor terminal is generally related to charge control, not in camera use.

Yep, and it didn't work.

There is a little red LED near the battery port that blinks briefly when I install the proper battery. It also blinks when I plug in my above set-up, but when I do what you suggested and omit the middle pin it does not blink.

I just picked up the appropriate resistors and will give it another go tomorrow.

Thanks for the help.

Hmmm, sounds like it is used to sense a low battery state then possibly ?

I think that Part number might be a typo as I was unable to find that port on my camera and could find reference to it anywhere else.

I have read up and found that the third pin is a thermisistor and I am working on simulating it by changing the resistance values of the voltage divider.

I will post later after I give it a shot.