05

6.0

Pin Details

Table 1 – Module pinout

Module

Pin

ESP32

GPIO

Pin

Name

Default Function

ADC

PWM

RTC†

Notes

21

32

P19

1

22

33

P20

1

23

26

P21

2*

DAC

24

25

P22

2*

DAC

25

14

P23

2*

JTAG TMS, SD card SCLK

26

–

–

Regulated 3.3V

supply

Output only, do not feed 3.3V into this pin

or you can damage the regulator

27

–

–

Ground

28

–

–

Voltage Input

Accepts a voltage between 3.5V and 5.5V

–

18

–

Sigfox reset

–

16

–

External WiFi/BT antenna switch, Low =

on–board, High = U.FL

–

23

–

Sigfox radio interrupt

–

17

–

Sigfox radio chip select

† 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.