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Hot-shoe signal to external GPS

Started Apr 24, 2017 | Questions thread
lidar532 New Member • Posts: 1
Re: Hot-shoe signal to external GPS

Hi there,

I've done this many times with Sony and Ricoh cameras, and you generally have to simply use a "Pull-up resistor".  To implement, on the GPS Event input, simply connect a 10k resistor from the Event input to the 3.3 volt power bus.  Connect the input to the hot shoe center contact, and a ground wire from the GPS ground to the hot shoe ground.  When you actuate the shutter, the camera will usually generate a "low active" signal while the shutter is open.  The GPS should easily accommodate any pulse width down to at least 1 micro second which is much shorter than any shutter setting you can generate.  Be sure to configure the GPS even input for "high to low" transition detection.  You should not need any debouncing circuit.

-Wayne

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