Arduino remote shutter for DSLR camera - need help with choosing right resistors

Projects General Guidance
1

Hi,
so I am trying to remotely trigger DSLR camera (Canon 5D) with Arduino. Impulses from arduino I am sending to optocoupler IL300. This optocoupler then switches camera shutter connected to Arduino via Camera remote connector. Check circuit connection in attechment.

So, what I want you to help me is to decide what will be the right resistors to connect between arduino output and optocoupler and between arduino output and 5V+. Best voltage and current for Optocoupler is 10mA and 1.25V.
Could you help me with that?

I am using Arduino Uno.

I there are any constructive suggesion to my circuit design, don't be afraid to let me know.

If you'll help me then I will buy u a beer. :slight_smile:

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2

10mA and 1.25V.

(5 - 1.25) / 0.01 = 375
Next preferred value = 390 ohms

3

There is no reason to provide a pull-up resistor on the Arduino, especially if you are referencing the optocoupler to ground, as the pull-up would then tend to turn the optocoupler on until the Arduino pin is defined as an output and set low.

390 ohms sounds perfect. I suspect 470 and even higher would do just fine.