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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

Rajraj wrote:

ISO 518:2006 only specifies the physical dimensions of camera accessory shoes. The electrical specifications are in ISO 10330. For electronic switches, it states that whatever voltage (max 24 V) that is asserted on the center pin by a flash, should be pulled down to 1.5 V or lower in one µs or less and be kept there for at least ten µs.

Ok.  1.5V doesn't sound like a reliable logic low for a signal that tops out at 3.7V... so that could well be the OP's issue...?  Anyway, like I said, I wouldn't trust my memory on this stuff, but perhaps it is time to pull out a scope (if the OP has one).

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