Two wire setup with refesh?

Archilochus

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Hi all,
While tinkering around with the latest bit of code for my microcontrollers - trying to free up an extra In/Out pin - I realized that we don't need to use a three wire shutter control in order to have a 'refresh'!
Since at best the Owl cams need a little over a second to snap a pic - you can just have the refresh be a shorter pulse of about 1/3 to 1/2 second.  That's too short to cause a pic to be taken - so you can just bridge the 1/2 and full press shutter contacts like in the two-wire setup.
This should save a bit of work, parts, and PC board space.

Seems like this should work fine for the Owl cams - don't know how well it would work with other models. Some cams don't like having the 1/2 and full contacts tied together - other cams might snap a pic too fast.

Archilochus
 

INshedpicker

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I'm sure you're right on Arch.  I sort of discovered this when trying to put a PF in my Camtrakker, I just didn't take it the extra step.  When wired with two-wire setup, the pulse from the Camtrakker wasn't long enough to trigger a pic; it would only get the job about half done(I don't know how long the pulse was).  It would take a bit of tinkering to get the timing right.
 

shrtcirkt

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Hmmm, thats very interesting Arch.... wonder if that would work with the D370 as well....
 

Tinhorn

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Man, I snuck out on a vacation for a couple weeks and now I'm LOST around here ! ! !

I used the 2 wire refresh on the cam (Owl PF) that took 7 seconds to fire (after setting out all night) with good success for about a year but then all of a sudden, the cam started taking a pix with every refresh pulse????

My refresh pulse may have been too long tho, I was using a TLC 555 wired as an Astable and maybe the 1/4 sec time Drifted.  At any rate, I opened the cam back up and added the 3rd wire and went to the "Conventional" refresh....

Just a note; When I 1st started using this circuit (and it was working Ok), I did plug in 2 other Owl PF's but they snapped a pix at every refresh pulse so maybe some cam's won't do as well as others or at least the refresh will have to be kept very short

Tinhorn
 

Archilochus

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Wish I had some PFs that would take a pic in 1/4 second!  Also, you'd lose some of the functions of the cams when removed from the housing.  Darn... I NEED one more I/O pin!

Archilochus
 
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