The {IDF_TARGET_NAME} chip features 34 physical GPIO pins (GPIO0 ~ GPIO19, GPIO21 ~ GPIO23, GPIO25 ~ GPIO27, and GPIO32 ~ GPIO39). Each pin can be used as a general-purpose I/O, or be connected to an internal peripheral signal. Through IO MUX, RTC IO MUX and the GPIO matrix, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any IO pins. Together these modules provide highly configurable I/O. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
- Strapping pin: GPIO0, GPIO2, GPIO5, GPIO12 (MTDI), and GPIO15 (MTDO) are strapping pins. For more infomation, please refer to `ESP32 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf>`_.
- SPI0/1: GPIO6-11 and GPIO16-17 are usually connected to the SPI flash and PSRAM integrated on the module and therefore should not be used for other purposes.
- JTAG: GPIO12-15 are usually used for inline debug.
- ADC2: ADC2 pins cannot be used when Wi-Fi is used. So, if you are having trouble getting the value from an ADC2 GPIO while using Wi-Fi, you may consider using an ADC1 GPIO instead, which should solve your problem. For more details, please refer to :ref:`Hardware Limitations of ADC Continuous Mode <hardware_limitations_adc_continuous>` and :ref:`Hardware Limitations of ADC Oneshot Mode <hardware_limitations_adc_oneshot>`.
- Please do not use the interrupt of GPIO36 and GPIO39 when using ADC or Wi-Fi and Bluetooth with sleep mode enabled. Please refer to `ESP32 ECO and Workarounds for Bugs <https://espressif.com/sites/default/files/documentation/eco_and_workarounds_for_bugs_in_esp32_en.pdf>`_ > Section 3.11 for the detailed description of the issue.
The {IDF_TARGET_NAME} chip features 43 physical GPIO pins (GPIO0 ~ GPIO21 and GPIO26 ~ GPIO46). Each pin can be used as a general-purpose I/O, or be connected to an internal peripheral signal. Through IO MUX, RTC IO MUX and the GPIO matrix, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any IO pins. Together these modules provide highly configurable I/O. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
- Strapping pin: GPIO0, GPIO45 and GPIO46 are strapping pins. For more infomation, please refer to `ESP32-S2 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf>`_
- SPI0/1: GPIO26-32 are usually used for SPI flash and PSRAM and not recommended for other uses.
The {IDF_TARGET_NAME} chip features 22 physical GPIO pins (GPIO0 ~ GPIO21). Each pin can be used as a general-purpose I/O, or be connected to an internal peripheral signal. Through GPIO matrix and IO MUX, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any IO pins. Together these modules provide highly configurable I/O. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
- Strapping pin: GPIO2, GPIO8 and GPIO9 are strapping pins. For more infomation, please refer to `ESP32-C3 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf>`_.
The {IDF_TARGET_NAME} chip features 45 physical GPIO pins (GPIO0 ~ GPIO21 and GPIO26 ~ GPIO48). Each pin can be used as a general-purpose I/O, or be connected to an internal peripheral signal. Through GPIO matrix, IO MUX, and RTC IO MUX, peripheral input signals can be from any GPIO pin, and peripheral output signals can be routed to any GPIO pin. Together these modules provide highly configurable I/O. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
- Strapping pin: GPIO0, GPIO3, GPIO45 and GPIO46 are strapping pins. For more infomation, please refer to `ESP32-S3 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf>`_.
- SPI0/1: GPIO26-32 are usually used for SPI flash and PSRAM and not recommended for other uses. When using Octal Flash or Octal PSRAM or both, GPIO33~37 are connected to SPIIO4 ~ SPIIO7 and SPIDQS. Therefore, on boards embedded with ESP32-S3R8 / ESP32-S3R8V chip, GPIO33~37 are also not recommended for other uses.
The {IDF_TARGET_NAME} chip features 21 physical GPIO pins (GPIO0 ~ GPIO20). For chip variants with an SiP flash built in, GPIO11 ~ GPIO17 are dedicated to connecting the SiP flash; therefore, only 14 GPIO pins are available.
Each pin can be used as a general-purpose I/O, or to be connected to an internal peripheral signal. Through GPIO matrix and IO MUX, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any IO pins. Together these modules provide highly configurable I/O. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
- Strapping pin: GPIO8 and GPIO9 are strapping pins. For more infomation, please refer to `ESP8684 datasheet <https://www.espressif.com/sites/default/files/documentation/esp8684_datasheet_en.pdf>`_.
The {IDF_TARGET_NAME} chip features 31 physical GPIO pins (GPIO0 ~ GPIO30).
- For chip variants with an SiP flash built in, GPIO24 ~ GPIO30 are dedicated to connecting the SiP flash; GPIO10 ~ GPIO11 are not led out to any chip pins; therefore, only the remaining 22 GPIO pins are available.
- For chip variants without an in-package flash, GPIO14 is not led out to any chip pins.
Each pin can be used as a general-purpose I/O, or to be connected to an internal peripheral signal. Through GPIO matrix and IO MUX, peripheral input signals can be from any IO pins, and peripheral output signals can be routed to any IO pins. Together these modules provide highly configurable I/O. For more details, see *{IDF_TARGET_NAME} Technical Reference Manual* > *IO MUX and GPIO Matrix (GPIO, IO_MUX)* [`PDF <{IDF_TARGET_TRM_EN_URL}#iomuxgpio>`__].
The table below provides more information on pin usage, and please note the comments in the table for GPIOs with restrictions.
..list-table::
:header-rows:1
:widths:8 12 12 20
* - GPIO
- Analog Function
- LP GPIO
- Comment
* - GPIO0
- ADC1_CH0
- LP_GPIO0
-
* - GPIO1
- ADC1_CH1
- LP_GPIO1
-
* - GPIO2
- ADC1_CH2
- LP_GPIO2
-
* - GPIO3
- ADC1_CH3
- LP_GPIO3
-
* - GPIO4
- ADC1_CH4
- LP_GPIO4
- Strapping pin
* - GPIO5
- ADC1_CH5
- LP_GPIO5
- Strapping pin
* - GPIO6
- ADC1_CH6
- LP_GPIO6
-
* - GPIO7
-
- LP_GPIO7
-
* - GPIO8
-
-
- Strapping pin
* - GPIO9
-
-
- Strapping pin
* - GPIO10
-
-
-
* - GPIO11
-
-
-
* - GPIO12
-
-
- USB-JTAG
* - GPIO13
-
-
- USB-JTAG
* - GPIO14
-
-
-
* - GPIO15
-
-
- Strapping pin
* - GPIO16
-
-
-
* - GPIO17
-
-
-
* - GPIO18
-
-
-
* - GPIO19
-
-
-
* - GPIO20
-
-
-
* - GPIO21
-
-
-
* - GPIO22
-
-
-
* - GPIO23
-
-
-
* - GPIO24
-
-
- SPI0/1
* - GPIO25
-
-
- SPI0/1
* - GPIO26
-
-
- SPI0/1
* - GPIO27
-
-
- SPI0/1
* - GPIO28
-
-
- SPI0/1
* - GPIO29
-
-
- SPI0/1
* - GPIO30
-
-
- SPI0/1
..note::
- Strapping pin: GPIO4, GPIO5, GPIO8, GPIO9, and GPIO15 are strapping pins. For more infomation, please refer to `ESP32C6 datasheet <https://www.espressif.com/sites/default/files/documentation/esp32c6_datasheet_en.pdf>`_.
- SPI0/1: GPIO24-30 are usually used for SPI flash and not recommended for other uses.
- USB-JTAG: GPIO 12 and 13 are used by USB-JTAG by default. In order to use them as GPIOs, USB-JTAG will be disabled by the drivers.
There is also separate "RTC GPIO" support, which functions when GPIOs are routed to the "RTC" low-power and analog subsystem. These pin functions can be used when:
