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Bevanj

El-cheepo Nauticam Optical trigger

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Hi Bevan:

 

Any chance you might publish the circuit diagram and parts list, so it can be adapted for other uses?

 

Many thanks, elias

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Posted (edited)

Hi Kraken,

I could do... let me give it some thought. It took me quite a while to design and tune the circuit for optimum performance.

Also, all of the components are only available in tiny packages like SOT-23 which there is pretty much no way to use without hot air soldering and custom designed PCBs.

In short, it is some schmitt inverters, logic gates, and an RC circuit to control the time length the LEDs turn on for when triggered.

I've got the Canon E-TTL protocol completely worked out now, and can get a Attiny chip to read the communication (MOSI/CLK) from a 5dmk3 to a 580EX2 speedlight and give the correct output responses (MISO) - proving my modeling of the protocol is correct. It is incredibly similar to the SPI protocol, but I have had to do some trick work to get it to function correctly with the Attiny chip.

I've also tested this protocol model with other Canon cameras my family own such as a 7Dmk1, 20d and G12 - it successfully works for all of them. Now I just need to design a circuit board to fit in my housing...

Bevan

Edited by Bevanj

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Hello Bevan,

 

Very interesting. I'd like to try it with my a7RII, with the LEDs on two short stalks to mate with a custom fiberoptic interface window. Any way I could get one?

 

Thanks,

 

Dave

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Hi, I will be interested to get one for 500d canon... Please advice!!

Thanks


Sent from my HMA-L29 using Tapatalk

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