NodeMCU 1.0
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Arduino code ESP8266 / NodeMCU 
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ESP8266 reference

NodeMCU board guide

Arduino IDE setup

  1. Add the ESP8266 Boards Manager URL in Arduino IDE Preferences.
  2. Install the esp8266 board package.
  3. Select NodeMCU 1.0 (ESP-12E Module).
  4. Open the downloaded .ino file, select the correct port, and upload.

Pin map

BoardGPIOCommon use
D016Digital I/O, wake
D15I²C SCL
D24I²C SDA
D30Boot strap — use carefully
D42Built-in LED, boot strap
D514SPI SCLK
D612SPI MISO
D713SPI MOSI
D815SPI CS, boot strap
A0ADC0Only analog input
Important: GPIO 0, 2 and 15 affect boot mode. Avoid sensors that force the wrong level during reset. The bare ESP8266 ADC is limited to 1.0 V; confirm whether your NodeMCU board includes an input divider before applying a higher voltage.

Start quickly

Choose an example