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Hot-shoe signal to external GPS

Started Apr 24, 2017 | Questions thread
jekain New Member • Posts: 2
Re: Hot-shoe signal to external GPS

ProfHankD --

Thanks for your response and the excellent articles.

I see in the paper you are using the stereo jack for the PCSynch as a shutter indicator (end of curtain travel). Is the same info provided by the XSynch on the Hotshoe?

The stereo "tip" (and I think the XSynch) is shorted to ground as an indication of the event. I assume that, to get an oscilloscope signal, you would connect a resistor (e.g., 2Kohm) to the XSynch and the other end of the resistor to a power source (e.g., 3,3V). By placing the Oscilloscope leads across the resistor, we should see the shutter event as a voltage pulse (3.3V).

So far, I am not getting the expected results. I see no voltage activity when using the circuit described above.  I'll keep trying -- maybe you have a suggestion?

I have the Canon mirrorless EOSR settings as I show below for the flash menu. Flash is "enabled" and the Slow Synchro is set to 1/200.  Per your paper, I should be able to set the center of the capture time by backing up the 1/200  by my shutter setting (e.g., 1/2000).

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