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esp32-wroom-30pin

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Firmware development for the 30-pin ESP32-WROOM-32 development board — the DOIT ESP32 DevKit V1 / ESP32 CH340 Type-C / NodeMCU-ESP32 30-pin form factor, 15 pins per side, CH340G or CP2102 USB-UART bridge, AMS1117 LDO, user LED on GPIO2. Use when working on a 30-pin ESP32 devkit (ESP32-D0WDQ6 / ESP32-D0WD-V3, ESP-WROOM-32 module): project setup, platformio.ini and sdkconfig for ESP-IDF or Arduino, pin mapping and which GPIOs are safe, strapping pins, ADC1 vs ADC2 with Wi-Fi, SPI speed and IO_MUX pins, I2C, deep sleep and RTC wake pins, flashing over the CH340 bridge, BOOT/EN recovery, brownouts, or debugging why something on the board does not work.

skills/esp32/esp32-wroom-30pin/SKILL.md

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Oct 30, 2026
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MIT

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# ESP32-WROOM-32 devkit — 30-pin

The commodity ESP32 board: `ESP-WROOM-32` module, USB-serial bridge, LDO, two buttons,
15 pins a side. It is the one that fits a breadboard with a row free, which is why it
outsells the 36- and 38-pin versions.

Nearly every failure on this board comes from a pin that has a second job. Read
`reference/board-hardware.md` before choosing pins rather than guessing from a tutorial —
a lot of ESP32 tutorials were written for a different board size.

- `reference/board-hardware.md` — the board: header pin map with every pin's alternate
  functions, what is *not* broken out and why that helps, the USB bridge and auto-reset
  circuit, power tree, flash partitions — **plus** a development guide (§10 toolchain,
  §11 sdkconfig, §12 flashing and recovery, §13 peripheral cookbook, §14 symptom → cause
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