ESP8266 NodeMCU pinout for Arduino IDE

 

NodeMCU pinout

For practical purposes ESP8266 NodeMCU V2 and V3 boards present identical pinouts. For our mechatronics projects we are mainly interested in the following pins:

• Power pins (3.3 V).
• Ground pins (GND).
• Analog pins (A0).
• Digital pins (D0 – D8, SD2, SD3, RX and TX – GPIO XX)

Most ESP8266 NodeMCU boards have one input voltage pin (Vin), three power pins (3.3v), four ground pins (GND), one analog pin (A0) and several digital pins (GPIO XX).

ESP8266 NodeMCU schematic

NodeMCU ESP8266 pinout

• NodeMCU V2
• NodeMCU V2 (5 pack)
• NodeMCU V3
• NodeMCU V3 (4 pack)

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If we want to interact with a digital pin in Arduino IDE we have to remember the GPIO number (0..16), whereas for the analog pin the alias is used (A0). Digital pins can be used as inputs or outputs, however the analog pin can only be used as an input.

Pin	Code	Arduino alias	Pin	Code	Arduino alias
A0	A0	A0	D6	GPIO 12	12
D0	GPIO 16	16	D7	GPIO 13	13
D1	GPIO 5	5	D8	GPIO 15	15
D2	GPIO 4	4	SD2	GPIO 9	9
D3	GPIO 0	0	SD3	GPIO 10	10
D4	GPIO 2	2	RX	GPIO 3	3
D5	GPIO 14	14	TX	GPIO 1	1

For example, the following code initializes the GPIO 4 and 5 digital pins as input and output, respectively and the analog pin (A0) as input.

pinMode(4,INPUT)

pinMode(5,OUTPUT)

pinMode(A0,INPUT)