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ESP32 DevKit v1 Pinout

Xtensa LX6 Dual-Core · 240 MHz · 3.3V I/O · 34 GPIO · ADC/DAC/Touch · WiFi + Bluetooth

5 Strapping-Pins (IO0, IO2, IO5, IO12, IO15) beeinflussen den Boot-Vorgang. GPIO 6-11 sind intern mit dem Flash-Chip verbunden — nicht extern verwenden. ADC2 funktioniert nicht gleichzeitig mit aktivem WiFi.

ESP32 DevKit v1

-- Micro USB --

3V3

GND

IO23

IO22

TX0

IO34

RX0

IO35

IO21

IO32

GND

IO33

IO19

IO25

IO18

IO26

IO5

IO27

IO17

IO14

IO16

IO12

IO4

GND

IO2

IO13

IO15

IO9

IO8

IO10

IO7

IO11

IO6

VIN

GND

Boot: IO0=LOW flash · IO2=LOW · IO5,IO15=HIGH

Click pin for details

All pins

38 Pins

Pin	Typ	Funktionen	Beschreibung
3V3	Power	3.3V Out	3.3V output of integrated regulator. Max. ~500 mA. Not for power-hungry actuators.
EN	Spezial	Enable / Reset	Chip Enable / Reset. Internal High. Pull to GND to reset the ESP32.
VP	ADC/DAC	GPIO36, ADC1_CH0	GPIO 36 — Input only, no internal pull-up/down. ADC1 Channel 0.
VN	ADC/DAC	GPIO39, ADC1_CH3	GPIO 39 — Input only, no internal pull-up/down. ADC1 Channel 3.
IO34	ADC/DAC	GPIO34, ADC1_CH6	GPIO 34 — Input only, no internal pull-up/down. ADC1 Channel 6.
IO35	ADC/DAC	GPIO35, ADC1_CH7	GPIO 35 — Input only, no internal pull-up/down. ADC1 Channel 7.
IO32	ADC/DAC	GPIO32, ADC1_CH4, Touch9, PWM	GPIO 32 — ADC1 Kanal 4, Kapazitiver Touch (Touch9), PWM (LEDC).
IO33	ADC/DAC	GPIO33, ADC1_CH5, Touch8, PWM	GPIO 33 — ADC1 Kanal 5, Touch8, PWM (LEDC).
IO25	ADC/DAC	GPIO25, ADC2_CH8, DAC1, PWM	GPIO 25 — ADC2 Channel 8, DAC1-Output (8-bit), PWM.
IO26	ADC/DAC	GPIO26, ADC2_CH9, DAC2, PWM	GPIO 26 — ADC2 Channel 9, DAC2-Output (8-bit), PWM.
IO27	PWM	GPIO27, ADC2_CH7, Touch7, PWM	GPIO 27 — ADC2 Kanal 7, Touch7, PWM.
IO14	SPI	GPIO14, ADC2_CH6, Touch6, SPI2 SCK, STRAP	GPIO 14 — STRAP-Pin! Boot HIGH -> SDIO/SPI-Debug-Log. SPI2 (HSPI) Clock, ADC2 Channel 6, Touch6.
IO12	SPI	GPIO12, ADC2_CH5, Touch5, SPI2 MISO, STRAP	GPIO 12 — STRAP-Pin! Boot LOW (otherwise Flash error at 3,3V Flash). SPI2 MISO, ADC2 Channel 5, Touch5.
GND	GND	Ground	Masse (GND).
IO13	SPI	GPIO13, ADC2_CH4, Touch4, SPI2 MOSI	GPIO 13 — SPI2 (HSPI) MOSI, ADC2 Kanal 4, Touch4.
IO9	Spezial	GPIO9, SPI0 HD	GPIO 9 — Internally connected to Flash chip (SPI0 HD). Not for external use.
IO10	Spezial	GPIO10, SPI0 WP	GPIO 10 — Internally connected to Flash chip (SPI0 WP). Not for external use.
IO11	Spezial	GPIO11, SPI0 CS	GPIO 11 — Internally connected to Flash chip (SPI0 CS). Not for external use.
VIN	Power	VIN	External 5V input. Powers the integrated 3,3V LDO regulator.
GND	GND	Ground	Masse (GND).
IO23	SPI	GPIO23, VSPI MOSI, PWM	GPIO 23 — VSPI MOSI (Standard SPI), PWM. No ADC when WiFi active.
IO22	I2C	GPIO22, I2C SCL, PWM	GPIO 22 — Standard I2C SCL (Wire), PWM.
TX0	UART	GPIO1, UART0 TX	GPIO 1 — UART0 TX (serial monitor). ESP32 sends boot messages at boot.
RX0	UART	GPIO3, UART0 RX	GPIO 3 — UART0 RX. Must be HIGH when flashing.
IO21	I2C	GPIO21, I2C SDA, PWM	GPIO 21 — Standard I2C SDA (Wire), PWM.
GND	GND	Ground	Masse (GND).
IO19	SPI	GPIO19, VSPI MISO, PWM	GPIO 19 — VSPI MISO (Standard SPI), PWM.
IO18	SPI	GPIO18, VSPI SCK, PWM	GPIO 18 — VSPI SCK (Standard SPI Clock), PWM.
IO5	SPI	GPIO5, VSPI CS, PWM, STRAP	GPIO 5 — STRAP-Pin! Boot HIGH. VSPI CS (Standard SPI), PWM.
IO17	UART	GPIO17, UART2 TX, PWM	GPIO 17 — UART2 TX (Serial2), PWM.
IO16	UART	GPIO16, UART2 RX, PWM	GPIO 16 — UART2 RX (Serial2), PWM.
IO4	ADC/DAC	GPIO4, ADC2_CH0, Touch0, PWM	GPIO 4 — ADC2 Kanal 0, Touch0, PWM.
IO2	Digital	GPIO2, ADC2_CH2, Touch2, PWM, LED, STRAP	GPIO 2 — STRAP-Pin! Keep LOW at boot. Onboard LED, ADC2 Channel 2, Touch2.
IO15	SPI	GPIO15, ADC2_CH3, Touch3, SPI2 CS, STRAP	GPIO 15 — STRAP-Pin! Boot HIGH. SPI2 (HSPI) CS, ADC2 Channel 3, Touch3.
IO8	Spezial	GPIO8, SPI0 Q	GPIO 8 — Internally connected to Flash chip (SPI0 Q). Not for external use.
IO7	Spezial	GPIO7, SPI0 D	GPIO 7 — Internally connected to Flash chip (SPI0 D). Not for external use.
IO6	Spezial	GPIO6, SPI0 CLK	GPIO 6 — Internally connected to Flash chip (SPI0 CLK). Not for external use.
GND	GND	Ground	Masse (GND).

Interactive ESP32 DevKit v1 Pinout Reference

Explore the comprehensive pinout of the ESP32 DevKit v1 using our interactive tool. This resource provides detailed technical specifications for the Xtensa LX6 Dual-Core processor, including its 240 MHz clock speed and integrated WiFi and Bluetooth capabilities. By clicking on any individual pin, you can quickly access specific details regarding ADC channels, PWM support, and touch sensitivity. It serves as a reliable reference for developers designing IoT projects with this popular development board.

Hardware Constraints and Safety Guidelines

Our tool highlights critical hardware limitations to help you avoid common design mistakes. It identifies that GPIO 6 through 11 are internally connected to the Flash chip and should not be used for external components. Additionally, it specifies input-only pins like GPIO 34 and 35 which lack internal pull-up or pull-down resistors. These details ensure your circuit remains stable and functional by preventing common wiring errors during the prototyping phase.

Frequently asked questions

Which pins are reserved for internal use?

GPIO pins 6, 7, 8, 9, 10, and 11 are internally connected to the Flash chip. These should not be used for external components as they are dedicated to SPI0 communication. Using these pins externally can cause system instability or prevent the device from booting correctly.

Which GPIOs only support input signals?

GPIO 34, 35, 36, and 39 are designated as input-only pins. These specific pins do not feature internal pull-up or pull-down resistors, meaning you must provide external resistors if your circuit requires them for stable signal detection.

Can I power motors from the 3.3V pin?

The integrated regulator provides a maximum of approximately 500 mA on the 3.3V output. This is sufficient for small sensors and indicators but is not suitable for powering heavy actuators, motors, or other power-hungry components that require high current.

Does WiFi usage affect any specific pins?

When WiFi is active, GPIO 23 loses its ADC functionality. While it remains available for VSPI MOSI and PWM functions, you should plan your hardware layout accordingly if you need to use this pin as an analog input while maintaining a wireless connection.