esp32-wroom-36pin

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, §13 peripheral cookbook, §14 symptom → cause → fix table).
• reference/esp32-soc.md — the silicon: pins that do not exist, strapping semantics and the GPIO_STRAP_REG bit order, ADC/DAC/touch maps and accuracy, IO_MUX vs GPIO Matrix and the SPI speed rule, power modes, memory map, deep-sleep wake pins.
• reference/esp32-family.md — the rest of the family, for "should this be a different ESP32?" questions: what does and does not port between chips, radio and USB capability per chip, the RMT generation table (WS2812 under Wi-Fi load), deep-sleep memory and ULP/LP-core availability, and a chip-selection table.
• reference/recipes.md — code that compiles: platformio.ini, sdkconfig.defaults, ADC1 with calibration, LEDC LED and servo, debounced input, the new I2C master driver, 80 MHz SPI, UART2, Wi-Fi scan and station connect, NVS, deep sleep, RMT WS2812.
• template/ — a project that builds clean, in two variants, plus a scaffold script. See template/README.md.

Confirm the board first

"36-pin ESP32" is the least standardised of the three sizes, and Espressif never made one, so there is no vendor pin table for it. Twenty seconds settles it: