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Author Topic: 4066 or 4016 to control canon camera shutter release.  (Read 630 times)
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Oz
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Folks,

A project I have in the works is shutter control for my camera.  (Canon)

I know the "mechanics" of what to short to FOCUS and SHOOT.

But as much as I love them:  Relays won't cut it.

So solid state would be the way to go.

I remember a 4066/4016.  Would they work, or are they any other "switches" I could use?
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Dallas
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I believe optocouplers are commonly used.
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Or possibly just a FET such as a 'Fetlington' 2N7000 ?

http://en.wikipedia.org/wiki/2N7000

« Last Edit: February 04, 2014, 05:35:59 am by cld_1 » Logged

Switzerland
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I've used transistors with success: npns in the "open-collector" or nFETs in the "open-drain" configuration. But I prefer opto-isolators just because it's harder to damage the camera. I used a MOC8103x, but it's likey most common types will work. Tested with an EOS 40D.
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I've used 4N25 and 4N26. They work like charm on Canons and are cheap enough.
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Oz
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Thanks folks.

Got the opto isolators.

4N25

I got the DMM and measured the voltages on the cable release.  All working.

Just downloaded the data sheet.

(Here's the stupid question)

Just asking:  I am guessing I will need a resistor between the Arduino and the LED/input.  Right?


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Yes.  The forward voltage is in the datasheet (1.3 typical, 1.5 maximum).  The absolute maximum forward current is 60mA.  Obviously don't exceed that current.

You'll be using it as a switch.  I assume you have to provide a minimum current for it to act like a switch.  I have no idea how to extract that value from the datasheet.
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Oz
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Coding,

The max fwd current of 60ma....  That's base, right?

So I = E/R.

If I do it for 50ma - which should be on strong enough - I just plug in the numbers for the resistor.
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Switzerland
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You don't need 60mA through the LED.  A 1k series resistor will work fine.

(4mA through the LED gives you up to 2mA through the phototransistor, and you need less than 100uA to trigger the camera.)
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Note 60mA exceeds the absolute maximum output current from an Arduino pin.

Just use 20mA, its the normal value for most opto couplers, from 5V than means
a 180 ohm resistor.
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Oz
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Thanks thanks thanks guys.

Very appreciated.

(I am kinda looking after a fish right now and it is difficult to know what he is feeling/doing.)

Anyway, I shall get going on the next phase.
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