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Update esp32_camera.rst (#3053) 

Add warning that GPIO16 will trigger watchdog on ai-thinker boards (and possibly others)
https://github.com/esphome/issues/issues/4014#issuecomment-1630334346 contains an example of the issue and there are many other sources online demonstrating resets as a result of using GPIO16. Pinout documentation states this GPIO is connected to PSRAM

Co-authored-by: H. Árkosi Róbert <robreg@zsurob.hu>
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Peter 2023-10-26 01:45:13 +11:00 committed by GitHub
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components/esp32_camera.rst
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@ -176,6 +176,12 @@ Test Setting:
Configuration for Ai-Thinker Camera
-----------------------------------
.. warning::
GPIO16 on this board (and possibly other boards below) is connected to onboard PSRAM.
Using this GPIO for other purposes (eg as a button) will trigger the watchdog.
Further information on pin notes can be found here: https://github.com/raphaelbs/esp32-cam-ai-thinker/blob/master/docs/esp32cam-pin-notes.md
.. code-block:: yaml
# Example configuration entry