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Pandoz

555 timer circuit question for my project

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Hi everyone, the RC-Cam projects are what really got me interested in remote photography (aerial in particular), in the first place, so I figured this would be the forum to address my problem in.

I want to be able to use the remote control system linked below to send the signal to a camera to start recording (just press the shutter button once and then leave the camera alone). The 555 circuit article below is kind of what I want, but I just want it to push the shutter button one time and then stop until I push the button again. I have found various timed circuits, but it seems that they will close the shutter once the time elapses. The camera I'm using takes 60 seconds video clips and so that is why I only need 1 push until I hit it again. If there is an easier way to doing this, please let me know (In digitial circuitry, a simple debouncer component could be used, but I don't know how to make this type of device with analog parts).

Here are links to all the parts I will be using if that helps:

555 circuit article:

http://www.engadget.com/2004/09/14/how-to-...t-1-the-camera/

555 component (wiki page):

http://en.wikipedia.org/wiki/555_timer

The camera is a Minolta Dimage E201 and my remote control that I will be using (it's a cheap R/C test before I get into real R/C controllers/vehicles) is here:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...AMEWN%3AIT&rd=1

Thanks a million for any help.

Ryan

EDIT: I found this tutorial. This "one shot" sounds sort of like what I need, but it sounds like once I let go of the button on my remote, it would send the reset signal, causing the shutter to close...Here's the link:

http://www.uoguelph.ca/~antoon/gadgets/555/555.html

Edited by Pandoz

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Does anyone understand this or make another possible suggestion on how to get my camera to take pictures using the remote control system? (besides using a servo)

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I'll admit that I am a little lost. Why do you need the one-shot? Why can't you just connect the Rx's relay contacts to the camera shutter switch? If you need external circuitry, what *exactly* will it need to do?

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I don't know why I was trying to make it so complicated. I am a first year student learning to become a computer hardware engineer (so I'm used to digital microchips instead of the entire circuit) and I'm still new to the whole thing.

The relay seems more valid after scouring through a bunch of forums. I think my biggest problem now is how much voltage is enough or too much to trigger the shutter. I know I have to use an Multimeter to measure resistance while pushing the buttons to find which are the control points, but I'm not sure how much voltage is needed from the relays to "push the shutter".

Sorry for any confusion and if this doesn't make sense just tell me and I will try something else.

Thanks for the time,

Ryan

Edited by Pandoz

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I'm not sure how much voltage is needed from the relays to "push the shutter".

No external voltage is used. The relay's normally open contacts simply wire ACROSS the shutter switch. In other words, the relay contacts go in parallel with the camera's existing shutter switch.

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Ok then, I was just confused when the guy said he used certain resistors with his. Thanks a bunch, saved me a lot of time and money :D

Ryan

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