NodeMCU (open hardware; generic makers)

NodeMCU V1.0 ESP8266 (ESP-12E) Board pinout

All 30 pins of the NodeMCU V1.0 ESP8266 (ESP-12E) Board, each mapped to the ESP8266EX pad it routes to, with its functions and — for 17 pins — the voltage and current limits from the chip datasheet.

30 pins17 with electrical limits1 analog2 other17 gpio4 ground3 power out2 control1 power in

NodeMCU V1.0 ESP8266 (ESP-12E) Board pins, functions and electrical limits

VIH/VIL: input thresholds · VOH/VOL: output levels · IOH/IOL: output current. Values apply to the chip pad each pin routes to, under the conditions cited in the source.
Pin	Position	Kind	Chip pad	Functions	VIH	VIL	VOH	VOL	IOH	IOL	5 V tolerant	Abs max	Source
A0	J1 (A0 side) · L1	analog	TOUT	A0 (10-bit, 0–3.3 V per Components101)
RSV	J1 (A0 side) · L2	other		rsv
RSV	J1 (A0 side) · L3	other		rsv
SD3	J1 (A0 side) · L4	gpio	GPIO10	SDIO_DATA_3, SPIWP (flash)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
SD2	J1 (A0 side) · L5	gpio	GPIO9	SDIO_DATA_2, SPIHD (flash)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
SD1	J1 (A0 side) · L6	gpio	GPIO8	SDIO_DATA1, SPID/MOSI (flash), U1RXD	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
CMD	J1 (A0 side) · L7	gpio	GPIO11	SDIO_CMD, SPICS0 (flash)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
SD0	J1 (A0 side) · L8	gpio	GPIO7	SDIO_DATA0, SPIQ/MISO (flash)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
CLK	J1 (A0 side) · L9	gpio	GPIO6	SDIO_CLK, SPICLK (flash)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
GND	J1 (A0 side) · L10	ground		ground
3V3	J1 (A0 side) · L11	power out		power_out
EN	J1 (A0 side) · L12	control	CHIP_EN	en
RST	J1 (A0 side) · L13	control	EXT_RSTB	rst
GND	J1 (A0 side) · L14	ground		ground
Vin	J1 (A0 side) · L15	power in		power_in									p.9 table 9_1
D0	J2 (D0 side) · R1	gpio	GPIO16	blue onboard LED (LED_BUILTIN), Deep-sleep wakeup (connect to EXT_RSTB)	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
D1	J2 (D0 side) · R2	gpio	GPIO5	IR Rx	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
D2	J2 (D0 side) · R3	gpio	GPIO4	PWM3	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
D3	J2 (D0 side) · R4	gpio	GPIO0	FLASH button, SPICS2	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
D4	J2 (D0 side) · R5	gpio	GPIO2	I2C_SDA (software I2C), U1TXD, I2SO_WS	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
3V3	J2 (D0 side) · R6	power out		power_out
GND	J2 (D0 side) · R7	ground		ground
D5	J2 (D0 side) · R8	gpio	GPIO14	HSPICLK, I2C_SCL (software I2C), I2SI_WS, PWM2, IR TX	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
D6	J2 (D0 side) · R9	gpio	GPIO12	HSPIQ/MISO, I2SI_DATA, PWM0	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
D7	J2 (D0 side) · R10	gpio	GPIO13	HSPID/MOSI, U0CTS, I2SI_BCK	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
D8	J2 (D0 side) · R11	gpio	GPIO15	HSPICS, U0RTS, I2SO_BCK, PWM1	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
RX	J2 (D0 side) · R12	gpio	GPIO3	U0RXD, I2SO_DATA	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
TX	J2 (D0 side) · R13	gpio	GPIO1	U0TXD, SPICS1	2.475–3.6 V	-0.3–0.825 V	≥ 2.64 V	≤ 0.33 V	≤ 12 mA	≤ 12 mA	no	-0.3–3.6 V	ESP8266EX datasheet p.24
GND	J2 (D0 side) · R14	ground		ground
3V3	J2 (D0 side) · R15	power out		power_out

NodeMCU V1.0 ESP8266 (ESP-12E) Board overview · All development boards