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    Detect-if-Connected circuit for DSLR -low voltage, low current.

    Hello, I have a DSLR camera which will have a long, wired remote trigger controlled by a microcontroller (I'm using an STM32 Nucleo). My goal is to: A. Detect that the remote trigger between the camera and MCU is plugged in, and illuminate an LED. B. Have the MCU trigger the shutter (take a...