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esp32-wroom-38pin

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Firmware development for the 38-pin ESP32-WROOM-32 development board — Espressif ESP32-DevKitC V4, Ai-Thinker NodeMCU-32S, DOIT ESP32 DevKit V1 38-pin and their CH340/CP2102 clones, 19 pins per side, with GPIO0 and the six in-package flash pins (GPIO6-11, labelled D0 D1 D2 D3 CMD CLK or SD0-SD3) broken out. Use when working on a 38-pin ESP32 devkit (ESP32-D0WDQ6 / ESP32-D0WD-V3, ESP-WROOM-32 or ESP32-WROVER module): project setup, platformio.ini and sdkconfig for ESP-IDF or Arduino, pin mapping and which GPIOs are safe, the flash-pin and IO0 traps, WROVER GPIO16/17 PSRAM conflict, 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-38pin/SKILL.md

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Oct 30, 2026
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# ESP32-WROOM-32 devkit — 38-pin

The reference form factor: Espressif's **ESP32-DevKitC V4** and the clones that copy its
J2/J3 header pin for pin. Nineteen pins a side, and every pad of the module is broken out —
including six that will hang the chip and one that will stop it booting.

That completeness is the whole story of this board. The 30-pin version protects you by
omission; this one hands you the flash bus and GPIO0 and expects you to know better.
Read `reference/board-hardware.md` before choosing pins.

- `reference/board-hardware.md` — the board: the Espressif J2/J3 header table with every
  pin's alternate functions, the six flash pins, the IO0 hazard, the `D2`-means-GPIO9
  silkscreen trap, the WROVER GPIO16/17 difference, the USB bridge and auto-reset circuit,
  power tree, flash partitions — **plus** a development guide (§10 toolchain, §11
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