user27319: I have a camera with a microSd card reader that is the only output type.
I want to read the microSd when the camera makes a photo.
How can I read it with an Arduino?
Duplicating the reader connections and join it to my Arduino microSd reader?
Or I can try to connect to the circuit (its very very small)?
Do you think I can put an ESP8266 to the camera?
Thanks for all!!!

user612: You cannot
SD cards cannot be shared between masters in operation, and it is unsafe to disconnect the card from the camera with an electronic switch when the camera is not expecting that.
Nor is an ordinary Arduino fast enough to passively snoop the data being written to the card by the camera (while a card will let an Arduino write to it quite slowly, any camera would do so far, far faster)
Nor is an ordinary Arduino able to do much of anything meaningful with the image files produced by a typical camera in real time.
Nor can an ESP8266 while running Arduino-based software; it apparently does have some high-speed I/O capabilities but that would require low-level rather than Arduino-port-based programming.
For all practical purposes, you'd need to power off the camera, remove the card, and place it in the Arduino reader.

27319: <p>I have a camera with a microSd card reader that is the only output type.
I want to read the microSd when the camera makes a photo.
How can I read it with an Arduino?
Duplicating the reader connections and join it to my Arduino microSd reader?
Or I can try to connect to the circuit (its very very small)?
Do you think I can put an ESP8266 to the camera?</p>

<p>Thanks for all!!!</p>
 612: <p><strong>You cannot</strong></p>

<p>SD cards cannot be shared between masters in operation, and it is unsafe to disconnect the card from the camera with an electronic switch when the camera is not expecting that.</p>

<p>Nor is an ordinary Arduino fast enough to passively snoop the data being written to the card by the camera (while a card will let an Arduino write to it quite slowly, any camera would do so far, far faster)</p>

<p>Nor is an ordinary Arduino able to do much of anything meaningful with the image files produced by a typical camera in real time.</p>

<p>Nor can an ESP8266 while running Arduino-based software; it apparently does have some high-speed I/O capabilities but that would require low-level rather than Arduino-port-based programming.</p>

<p>For all practical purposes, you'd need to power off the camera, remove the card, and place it in the Arduino reader.</p>
