Raspberry Pi-Based Cable Shutter Release Now with DIY OptocouplersFeb 25, 2015, 07:00 (0 Talkback[s])
(Other stories by Dmitri Popov)
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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