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esp32-wroom-36pin

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Firmware development for the 36-pin ESP32-WROOM-32 development board — the original DOIT ESP32 DevKit V1 with 18 pins per side, i.e. the 30-pin layout plus the six in-package flash pins (SD0 SD1 SD2 SD3 CMD CLK = GPIO6-11) broken out at the USB end, CH340G or CP2102 bridge, AMS1117 LDO, user LED on GPIO2, GPIO0 not on the header. Use when working on a 36-pin ESP32 devkit (ESP32-D0WDQ6 / ESP32-D0WD-V3, ESP-WROOM-32 module), or when identifying which ESP32 board size you have: project setup, platformio.ini and sdkconfig for ESP-IDF or Arduino, pin mapping and which GPIOs are safe, the flash-pin trap, strapping pins, ADC1 vs ADC2 with Wi-Fi, SPI speed and IO_MUX pins, deep sleep and RTC wake pins, flashing, BOOT/EN recovery, brownouts, or debugging why something on the board does not work.

skills/esp32/esp32-wroom-36pin/SKILL.md

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Nov 11, 2026

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Repository last updated
Oct 30, 2026
License
MIT

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# ESP32-WROOM-32 devkit — 36-pin

The original DOIT ESP32 DevKit V1, before the flash pins were dropped to make the shorter
30-pin board everyone sells now. Eighteen pins a side: the 30-pin layout plus six pins at
the USB end that go straight to the module's internal flash die.

Those six are the only functional difference from the 30-pin board, and they are a
liability rather than a feature. Everything else — the usable GPIO set, the strapping
pins, the analog budget — is identical.

- `reference/board-hardware.md` — the board: header pin map with every pin's alternate
  functions, the six flash pins, a 20-second procedure to confirm which board size you
  actually have, the USB bridge and auto-reset circuit, power tree, flash partitions —
  **plus** a development guide (§10 toolchain, §11 sdkconfig, §12 flashing and recovery,
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