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GPIO PINS:
<br>The main io pins available for general use are 13 and 12 (12 must not be high at boot and sd-card needs to be in 1-bit mode),
<br>14, 2 & 15 should also be available if you are not using the SD Card.
<br>You can also use pins 1 and 3 if you do not use Serial.
<br>The available pins are very limited on the esp32cam, my best understanding is:
<br>If using the sd card (must be in 1-bit mode) the main io pins available for general use are 13 and 12 (12 must not be high at boot),
14, 2 & 15 should also be available if you are not using the SD Card.
<br>You can also use pins 1 and 3 if you do not use Serial. Pin 4 is the onboard flash LED which you could remove and use this pin for i/o
(but again sd card must be in 1-bit mode if using the sd card)?
<br>More info: https://randomnerdtutorials.com/esp32-cam-ai-thinker-pinout/
<br>BTW-You can use an MCP23017 io expander chip on pins 12 and 13 to give you 16 general purpose gpio pins, this requires the adafruit MCP23017 library to be installed.
<br>Pin 16 is used for psram but you may get away with using it as input for a button etc.?