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Hi, we have a few examples here for connecting OpenMV to Arduino:
https://github.com/openmv/openmv/tree/master/scripts/examples/00-Arduino
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Yes, again please see the examples, you can modify any example to do exactly what you want. For example, see the arduino_uart.py, you can modify that to save snapshot when it receives a message and then save it as main.py to run when the camera restarts. Also please search the forums, this question has been answered so many times before.
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Sending an image from the camera to an Arduino is very difficult because the Arduino doesn’t have enough ram to buffer a jpeg. So, you have to write a serial protocol that sends only a few bytes at a time.
Given this type of usage defeats the purpose of our product I would advise against wanting to do this. You should make the OpenMV Cam the master device and the Arduino and I/O interface device only.