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 photo).
It must be a wired solution. I know there are wireless options, but they are not suitable for the project.
The camera trigger port seems to have about 1.8V and 0.2mA max.
Currently, I have part B working - I'm using an optoisolator (4N27) where the IR led is controlled by the MCU, and the transistor acts as a switch to shutter the camera and I take a photo.
Since the camera is using a battery, and my MCU will have it's own source - I believe I need the isolation so the grounds are totally seperate.
I'm having trouble with part A - The camera trigger isn't going to power an led for the optoisolator, so I think I need to sense the voltage present and translate that into an output the MCU can read and then the MCU can drive an indicator led that the trigger is connected between the camera and the MCU.
I've found some isolated amplifiers like AMC1302 - but I don't understand how to implement the 'high side' and 'low side' or 'floating' power supplies. I only have my MCU source, and the camera trigger signal.
I'm actively researching this, but before I went too far down a rabbit hole I wanted to solicit some experience as to whether this a solution I can use, or is there something better/more obvious?
Thanks!
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 photo).
It must be a wired solution. I know there are wireless options, but they are not suitable for the project.
The camera trigger port seems to have about 1.8V and 0.2mA max.
Currently, I have part B working - I'm using an optoisolator (4N27) where the IR led is controlled by the MCU, and the transistor acts as a switch to shutter the camera and I take a photo.
Since the camera is using a battery, and my MCU will have it's own source - I believe I need the isolation so the grounds are totally seperate.
I'm having trouble with part A - The camera trigger isn't going to power an led for the optoisolator, so I think I need to sense the voltage present and translate that into an output the MCU can read and then the MCU can drive an indicator led that the trigger is connected between the camera and the MCU.
I've found some isolated amplifiers like AMC1302 - but I don't understand how to implement the 'high side' and 'low side' or 'floating' power supplies. I only have my MCU source, and the camera trigger signal.
I'm actively researching this, but before I went too far down a rabbit hole I wanted to solicit some experience as to whether this a solution I can use, or is there something better/more obvious?
Thanks!