User's Manual

2.2 Pin Description 2 PIN DEFINITIONS
2.2 Pin Description
ESP-WROOM-32 has 38 pins. See pin definitions in Table 3.
Table 3: ESP-WROOM-32 Pin Definitions
Name No. Function
GND 1 Ground
3V3 2 Power supply.
EN 3 Chip-enable signal. Active high.
SENSOR_VP 4 GPI36, SENSOR_VP, ADC_H, ADC1_CH0, RTC_GPIO0
SENSOR_VN 5 GPI39, SENSOR_VN, ADC1_CH3, ADC_H, RTC_GPIO3
IO34 6 GPI34, ADC1_CH6, RTC_GPIO4
IO35 7 GPI35, ADC1_CH7, RTC_GPIO5
IO32 8
GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4,
TOUCH9, RTC_GPIO9
IO33 9
GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5,
TOUCH8, RTC_GPIO8
IO25 10 GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0
IO26 11 GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1
IO27 12 GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17, EMAC_RX_DV
IO14 13
GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK, HS2_CLK,
SD_CLK, EMAC_TXD2
IO12 14
GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ, HS2_DATA2,
SD_DATA2, EMAC_TXD3
GND 15 Ground
IO13 16
GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID, HS2_DATA3,
SD_DATA3, EMAC_RX_ER
SHD/SD2 17 GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD
SWP/SD3 18 GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD
SCS/CMD 19 GPIO11, SD_CMD, SPICS0, HS1_CMD, U1RTS
SCK/CLK 20 GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS
SDO/SD0 21 GPIO7, SD_DATA0, SPIQ, HS1_DATA0, U2RTS
SDI/SD1 22 GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS
IO15 23
GPIO15, ADC2_CH3, TOUCH3, MTDO, HSPICS0, RTC_GPIO13, HS2_CMD,
SD_CMD, EMAC_RXD3
IO2 24
GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0,
SD_DATA0
IO0 25 GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1, EMAC_TX_CLK
IO4 26
GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1,
SD_DATA1, EMAC_TX_ER
IO16 27 GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT
IO17 28 GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180
IO5 29 GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK
IO18 30 GPIO18, VSPICLK, HS1_DATA7
IO19 31 GPIO19, VSPIQ, U0CTS, EMAC_TXD0
NC 32 -
Espressif Systems 4 http://www.espressif.com