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esp8266-nodemcu-30pin

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Firmware development for the 30-pin NodeMCU ESP8266 devkit — NodeMCU DevKit V1.0 / Amica (CP2102) and LoLin NodeMCU V3 (CH340G), built on the Ai-Thinker ESP-12E or ESP-12F module (ESP8266EX, 4 MB flash), with PlatformIO and the Arduino ESP8266 core (`board = nodemcuv2`). Use when working on a NodeMCU, ESP-12E, ESP-12F or ESP8266 devkit: project setup, platformio.ini, the D0-D10 vs GPIO numbering, which pins are safe and which break the boot, GPIO15/GPIO0/GPIO2 strapping, the A0 divider and 1 V ADC, software I2C and software PWM, analogWrite range, LittleFS and flash layouts, OTA, deep sleep and the missing GPIO16-to-RST link, Wi-Fi, heap exhaustion, watchdog and Soft WDT resets, exception decoding, flashing over CP2102/CH340, or debugging why the board does not boot, prints garbage, or reboots by itself.

skills/esp8266/esp8266-nodemcu-30pin/SKILL.md

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# NodeMCU ESP8266 devkit — 30-pin

The board that made the ESP8266 usable: an Ai-Thinker ESP-12E/F module, a USB-UART
bridge, an LDO, two buttons, 15 pins a side. Everything hard about it is a pin with a
second job, a peripheral that is software rather than silicon, or a number that means
something different than it looks like.

Read `reference/board-hardware.md` before choosing pins. Most ESP8266 tutorials are
written for core 2.x and for a different board; several of their defaults are now wrong.

- `reference/board-hardware.md` — the board: full header map with D-number ↔ GPIO
  translation, the strapping resistors and their values, the two LEDs, the A0 divider,
  the auto-program circuit and its truth table, the power tree — **plus** a development
  guide (§9 toolchain and flash layouts, §10 flashing and recovery, §11 peripheral
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