Ultimate guide to ESP2866 pin/GPIO numbers
Updated 1,929 Days AgoPublic
Actions

^ Package pin number ^ Manufacturer name ^ GPIO number ^ Nodemcu name ^ Alternative functions ^ Notes ^

1	VDDA
2	LNA
3	VDD3P3
4	VDD3P3
5	VDD_RTC
6	TOUT		A0	ADC	0-1.0V raw, 0-3.2V nodemcu
7	CHIP_PU		EN	Chip enable	High ON, Low OFF (with a small current consumed)
8	XPD_DCDC	GPIO16	D0	WAKE UP	Connect to EXT_RSTB (RESET) to support wakeup from deep-sleep. user/reset button on modemcu - pressed LOW, user LED on nodemcu - LOW ON, no interrupt/pwm/fancy features support - only I/O
9	MTMS	GPIO14	D5	HSPI_CLK, alternative I2C_SCL
10	MTDI	GPIO12	D6	HSPI_MISO
11	VDDPST
12	MTCK	GPIO13	D7	HSPI_MOSI, UART0_CTS, alternative UART0_RX	To use alternative function please see manufacturer doc
13	MTDO	GPIO15	D8	HSPI_CS, UART0_RTS, alternative USART0_TX	To use alternative function please see manufacturer doc, keep LOW during boot
14	GPIO2	GPIO2	D4	USART1_TX, alternative I2C_SDA	May print garbage during boot/programming, keep HIGH during boot
15	GPIO0	GPIO0	D3	SPI_CS2	On nodemcu run/flash selector - run HIGH, flash LOW
16	GPIO4	GPIO4	D2
17	VDDPST
18	SDIO_DATA_2	GPIO9	SD2 (D11)	SD_D2	Connected to flash in most modules
19	SDIO_DATA_3	GPIO10	SD3 (D12)	SD_D3	Connected to flash in most modules
20	SDIO_CMD	GPIO11	CMD	SD_CMD	Connected to flash in most modules
21	SDIO_CLK	GPIO6	CLK	SD_CLK	Connected to flash in most modules
22	SDIO_DATA_0	GPIO7	SD0	SD_D0	Connected to flash in most modules
23	SDIO_DATA_1	GPIO8	SD1	SD_D1	Connected to flash in most modules
24	GPIO5	GPIO5	D1
25	U0RXD	GPIO3	D9	UART0_RX	UART RX during programming
26	U0TXD	GPIO1	D10	UART0_TX, SPI_CS1	UART TX during programming
27	XTAL_OUT
28	XTAL_IN
29	VDDD
30	VDDA
31	RES12K				Connect to ground with 12kΩ resistor
32	EXT_RSTB		RST	Reset	External reset, reset LOW, active HIGH

Subscribers

jkramarz edited the content of this document. (Show Details)

Ultimate guide to ESP2866 pin/GPIO numbersUpdated 1,929 Days AgoPublicActions