05

6.0

Pin Details

Table 1 – Module pinout

Module

Pin

ESP32

GPIO

Pin

Name

Default Function

ADC

PWM

RTC†

Notes

23

37

P14

MISO

1

Input only

24

38

P15

1

Input only

25

39

P16

1

Input only

26

35

P17

1

Input only

27

34

P18

1

Input only

28

32

P19

1

29

33

P20

1

30

26

P21

2*

DAC

31

25

P22

2*

DAC

32

14

P23

2*

JTAG TMS, SD card SCLK

33

–

–

3.3V input

This supply should be able to source

650mA

34

–

–

Ground

35

–

–

1.8V Output

Only when the device is active, during

deep sleep this drops to 0V

† The pins on the RTC power domain can be used during deep sleep, specifically GPIO pins will maintain their state while in deep sleep.

* ADC2 is currently not supported in the micropython firmware

6.1

Remapping Pins

The ESP32 features comprehensive pin remapping

functionality. This allows peripherals to be mapped

onto almost any available GPIO pins. The above table

merely shows the default assignments. For example, the

default mapping has the SPI and I2C clocks overlapping,

meaning both cannot be used simultaneously without

remapping one to a different pin. For a detailed guide of

what peripheral can be assigned to what pins please read

“Appendix A – ESP32 Pin Lists” of the ESP32 datasheet.