Espressif ESP8266 User Manual

changed the pin naming for their LUA firmware. If you are programming a NodeMCU module
you can use the printed D# names. If you use a generic ESP8266 module then you have to
use the corresponding GPIO numbers. Here is a table of the mapping:
The NodeMCU Index is the name on the board, whereas the ESP8266 Internal column is the
one you use in the Arduino IDE code: e.g. D5 on the board is pin GPIO14 in C/C++.
NodeMCU Index
ESP8266 Internal
NodeMCU Index
ESP8266 Internal
D0
GPIO16
D7
GPIO13
D1
GPIO5
D8
GPIO5
D2
GPIO4
D9
GPIO3
D3
GPIO0
D10
GPIO1
D4
GPIO2
D11
GPIO9
D5
GPIO14
D12
GPIO10
D6
GPIO12

Espressif ESP8266 Specifications

General

Digital I/O Pins	17
Analog Input Pins	1
Wi-Fi	802.11 b/g/n
Operating Voltage	3.0V - 3.6V
Clock Speed	80 MHz / 160 MHz
Operating Temperature	-40°C to 125°C
Dimensions	24mm x 14mm
Processor	Tensilica L106 32-bit micro controller