ESP32-DevKitC-1

The ESP32-DevKitC-1 development board is one of Espressif’s official boards. This board is based on the ESP32-WROVER-E module, with the ESP32 as the core.

Specifications

  • Wi-Fi 802.11b/g/n (802.11n up to 150 Mbps)

  • Bluetooth v4.2 BR/EDR and BLE specification

  • Built around ESP32 series of SoCs

  • Integrated 4 MB SPI flash

  • Integrated 8 MB PSRAM

  • Peripherals

    • SD card

    • UART

    • SPI

    • SDIO

    • I2C

    • LED PWM

    • Motor PWM

    • I2S

    • IR

    • Pulse Counter

    • GPIO

    • Capacitive Touch Sensor

    • ADC

    • DAC

    • Two-Wire Automotive Interface (TWAI®, compatible with ISO11898-1)

  • PCB antenna or external antenna connector

Header Block

Note

Not all of the chip pins are exposed to the pin headers.

J1

No.

Name

Type

Function

1

3V3

P

3.3 V power supply

2

EN

I

CHIP_PU, Reset

3

IO36

I

GPIO36, ADC1_CH0, S_VP

4

IO39

I

GPIO39, ADC1_CH3, S_VN

5

IO34

I

GPIO34, ADC1_CH6, VDET_1

6

IO35

I

GPIO35, ADC1_CH7, VDET_2

7

IO32

I/O

GPIO32, ADC1_CH4, TOUCH_CH9, XTAL_32K_P

8

IO33

I/O

GPIO33, ADC1_CH5, TOUCH_CH8, XTAL_32K_N

9

IO25

I/O

GPIO25, ADC1_CH8, DAC_1

10

IO26

I/O

GPIO26, ADC2_CH9, DAC_2

11

IO27

I/O

GPIO27, ADC2_CH7, TOUCH_CH7

12

IO14

I/O

GPIO14, ADC2_CH6, TOUCH_CH6, MTMS

13

IO12

I/O

GPIO12, ADC2_CH5, TOUCH_CH5, MTDI

14

GND

G

Ground

15

IO13

I/O

GPIO13, ADC2_CH4, TOUCH_CH4, MTCK

16

IO9

I/O

GPIO9, D2

17

IO10

I/O

GPIO10, D3

18

IO11

I/O

GPIO11, CMD

19

5V0

P

5 V power supply

J3

No.

Name

Type

Function

1

GND

G

Ground

2

IO23

I/O

GPIO23

3

IO22

I/O

GPIO22

4

IO1

I/O

GPIO1, U0TXD

5

IO3

I/O

GPIO3, U0RXD

6

IO21

I/O

GPIO21

7

GND

G

Ground

8

IO19

I/O

GPIO19

9

IO18

I/O

GPIO18

10

IO5

I/O

GPIO5

11

IO17

I/O

GPIO17

12

IO16

I/O

GPIO16

13

IO4

I/O

GPIO4, ADC2_CH0, TOUCH_CH0

14

IO0

I/O

GPIO0, ADC2_CH1, TOUCH_CH1, Boot

16

IO2

I/O

GPIO2, ADC2_CH2, TOUCH_CH2

17

IO15

I/O

GPIO15, ADC2_CH3, TOUCH_CH3, MTDO

17

IO8

I/O

GPIO8, D1

18

IO7

I/O

GPIO7, D0

19

IO6

I/O

GPIO6, SCK

P: Power supply; I: Input; O: Output; T: High impedance.

Pin Layout

ESP32-DevKitC-1 (click to enlarge)

Strapping Pins

Some of the GPIO’s have important features during the booting process. Here is the list of the strapping pins on the ESP32.

GPIO

Default

Function

Pull-up

Pull-down

IO12

Pull-down

Voltage of Internal LDO (VDD_SDIO)

1.8 V

3.3 V

IO0

Pull-up

Booting Mode

SPI Boot

Download Boot

IO2

Pull-down

Booting Mode

Don’t Care

Download Boot

IO15

Pull-up

Enabling/Disabling Log Print During Booting and Timing of SDIO Slave

U0TXD Active

U0TXD Silent

IO5

Pull-up

Timing of SDIO Slave

See ESP32

See ESP32

Be aware when choosing which pins to use.

Restricted Usage GPIO’s

Some of the GPIO’s are used for the external flash and PSRAM. These GPIO’s cannot be used:

GPIO

Shared Function

IO6

External SPI Flash

IO7

External SPI Flash

IO8

External SPI Flash

IO9

External SPI Flash

IO10

External SPI Flash

IO11

External SPI Flash

Other GPIO’s are INPUT ONLY and cannot be used as output pin:

GPIO

Function

IO34

GPIO34, ADC1_CH6, VDET_1

IO35

GPIO35, ADC1_CH7, VDET_2

IO36

GPIO36, ADC1_CH0, S_VP

IO39

GPIO39, ADC1_CH3, S_VN

Resources