ESP32 Bootstrap Pins Explained

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On this module, the input-only GPIO is GPIO46 / IO46.
In Flux terms, an Input pin means input-only, while Bi-Directional / I/O means it can be used as both an input and an output . So the practical distinction you care about is:

Table

PinUse
IO46Input only
Most other exposed IOx pinsCan be used as normal GPIO input/output
A few practical notes:
  • IO46 is not a good choice for driving LEDs, chip selects, enables, or any other output signal.
  • It can still be used for things like button inputs, status inputs, interrupt inputs, etc.
  • IO46 is also one of the strapping pins, so be careful not to force it to the wrong level during reset/boot.
If you want, I can give you a safe GPIO cheat sheet for this module:
  • safe general-purpose pins
  • bootstrap pins to avoid
  • USB/JTAG-sensitive pins
  • unavailable pins on the N4R8 variant.
Check selected pins
Show pin restrictions
Recommend safe usage
4 days
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    ESP32-S3-WROOM-1-N4R8

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    mouser.com/datasheet/2/891/esp32_s3_wroom_1_wroom_1u_datasheet_en-2930317.pdf

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    parametric-v1

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