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Hot-shoe signal to external GPS

Started Apr 24, 2017 | Questions thread
ProfHankD
ProfHankD Veteran Member • Posts: 9,146
Re: Hot-shoe signal to external GPS
1

jekain wrote:

I am trying to get an interrupt into a microcontroller at the shutter-open event.

We do this in ShAKY (SHift Angle KentuckY), and you'll find the wiring and Arduino code for ShAKY at the URL I linked. Note that the flash trigger marks "fully open" on the focal-plane shutter, not start of exposure (i.e., it's late by your camera's curtain traversal time, which is approximately your X sync speed).

I am using a Canon EOSR camera. I hope to be able to use the hotshoe to provide this interrupt signal. The Canon has 5 connections at the hotshoe plus the ground (rails).

I have tested the pins using a scope. The only setting in this camera that seems to be useful is to set the flash to "enable".

I can set up the oscilloscope to read the time-signal between the 5 pins and ground. I click the shutter (manually) and can see the response from the pins. I show the oscilloscope connection below. I also show the oscilloscope traces for several clicks.

It's a switch, not a signal. See my posts above or the ShAKY URL.

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