ESP32 Pin out

ESP32 Pin out differ depending of the physical hardware. What is common is the GPIO numbering. So refer to the documentation of your specific board to find out the physical relation.

You can find all the details for the default mapping in this file

The default mapping defines how the pins are configured on start up. These pins configurations can be configured/redefined using the nanoFramework.Hardware.Esp32 assembly.

Example configuration

// Define MOSI pin for SPI2 as GPIO 15
Configuration.SetPinFunction(15, DeviceFunction.SPI2_MOSI);
// Define LED PWM channel 1 GPIO 16
Configuration.SetPinFunction(16, DeviceFunction.PWM1);
// Redefine I2C2 data pin from GPIO 25 to GPIO 17
Configuration.SetPinFunction(17, DeviceFunction.I2C2_DATA);

ESP32 Default Mapping

NP = Pin is undefined at startup

I2C

There are 2 I2C bus available:

I2C#	Data	Clock
I2C1	GPIO 18	GPIO 19
I2C2	GPIO 25	GPIO 26

SPI

There are 2 SPI possible configurations:

SPI#	MOSI	MISO	Clock
SPI1	GPIO 23	GPIO 25	GPIO 19
SPI2	NP	NP	NP

Serial ports

You have 2 serial ports available, COM1 is reserved for debugging when enabled.

COM#	Transfer (Tx)	Reception (Rx)	RTS	CTS
COM1	GPIO 1	GPIO 3	GPIO 19	GPIO 22
COM2	NP	NP	NP	NP
COM3	NP	NP	NP	NP

Led PWM channels

There are 16 LED PWM channels on ESP32 For all channels the GPIO pins are undefined at startup.

ADC

We use "ADC1" for 20 logical channels mapped to ESP32 controllers

ADC#	Channel #	GPIO #	Note
ADC1	0	36
ADC1	1	37
ADC1	2	38
ADC1	3	39
ADC1	4	32
ADC1	5	33
ADC1	6	34
ADC1	7	35
ADC1	8	36	Internal Temperture sensor (VP)
ADC1	9	39	Internal Hall Sensor (VN)
ADC2	10	04
ADC2	11	00
ADC2	12	02
ADC2	13	15
ADC2	14	13
ADC2	15	12
ADC2	16	14
ADC2	17	27
ADC2	18	25
ADC2	19	26

DAC

2 DAC are available on the ESP32:

DAC#	GPIO #
DAC1	25
DAC2	26