Raspberry Pi-Based Cable Shutter Release — Now with DIY Optocouplers

Posted by dmpop on Feb 25, 2015 9:06 PM EDT
Scribbles and Snaps; By Dmitri Popov
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While a transistor-based cable shutter release does the job, it has one drawback. Grounding the camera to Raspberry Pi can cause the machine or the camera to have a negative ground.

While a transistor-based cable shutter release does the job, it has one drawback. Grounding the camera to Raspberry Pi can cause the machine or the camera to have a negative ground. This might lead to a higher total voltage difference and could damage either of them. One way to solve this problem is to separate the camera and Raspberry Pi circuits using optocouplers (or opto-isolators).

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