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ESP32-DevKitC specs, pinout & datasheets

Microcontroller board · Espressif

Espressif’s reference ESP32 board: an ESP32-WROOM or WROVER module with USB-serial and every pin on two breadboard headers.

CPU
2 × Xtensa LX6, 32-bit (1 core on the SOLO-1 version)
Clock
Up to 240 MHz
RAM
520 KB SRAM (plus 8 MB PSRAM on WROVER-E versions)
Flash
4, 8 or 16 MB, depending on the module
Wireless
2.4 GHz 802.11 b/g/n Wi-Fi; Bluetooth 4.2 BR/EDR and BLE
I/O voltage
3.3 V
Status
In production

Specs checked against the cited sources on 1 October 2026 (AI-assisted source check). Spotted a mistake? Use the form at the end of the page.

Specifications

9 specs
Chip / SoC
Espressif ESP32 in an ESP32-WROOM-32E/UE or WROVER-E/IE module (older boards: WROOM-32/32D/32U, SOLO-1)[1]
CPU
2 × Xtensa LX6, 32-bit (1 core on the SOLO-1 version)[2]
Clock
Up to 240 MHz[2]
RAM
520 KB SRAM (plus 8 MB PSRAM on WROVER-E versions)[7]
Flash
4, 8 or 16 MB, depending on the module[6]
I/O voltage
3.3 V[2]
Wireless
2.4 GHz 802.11 b/g/n Wi-Fi; Bluetooth 4.2 BR/EDR and BLE[2]
USB
Micro-USB via a USB-to-UART bridge[1]
Upload limits
4 MB flash, 320 KB RAM[8]

Upload limits are what a sketch or firmware may use after the bootloader, as the build tools enforce them, not the chip’s full memory.

Can I still use it?

5 platforms
Arduino framework
Supported[5]Arduino core for the ESP32 by Espressif.
MicroPython
Supported[12]
CircuitPython
Supported[10]
Zephyr RTOS
Supported[9]
ESP-IDF
Supported[4]

As published by each project, checked weekly. A platform not listed has no published information here, which is not the same as no support.

Datasheets and documents

4 documents

Pinout

32 pins
Pin names in firmware (32 pins)
From the firmware’s board definition[13]
Chip pinBoard names
GPIO0IO0, BUTTON, BOOT0
GPIO1IO1, TX
GPIO2IO2
GPIO3IO3, RX
GPIO4IO4
GPIO5IO5
GPIO6CLK, IO6
GPIO7D0, IO7
GPIO8D1, IO8
GPIO9D2, IO9
GPIO10D3, IO10
GPIO11CMD, IO11
GPIO12IO12
GPIO13IO13
GPIO14IO14
GPIO15IO15
GPIO16IO16
GPIO17IO17
GPIO18IO18
GPIO19IO19
GPIO21IO21
GPIO22IO22
GPIO23IO23
GPIO25IO25
GPIO26IO26
GPIO27IO27
GPIO32IO32
GPIO33IO33
GPIO34I34
GPIO35I35
GPIO36I36, VP
GPIO39I39, VN

Gotchas

4 known issues
  • ADC2 unavailable with Wi-Fi. On the original ESP32, the ADC2 channels cannot be read while Wi-Fi is running; put analog inputs on ADC1 pins (GPIO32–39).[3]
  • Strapping pins. Some GPIOs set the boot mode at reset (GPIO0, 2, 5, 12 and 15 on the ESP32). Pulling them the wrong way stops the board booting or flashing; GPIO12 high at boot can select the wrong flash voltage.[2]
  • Flash pins are off limits. GPIO6 to GPIO11 connect to the module's SPI flash; avoid them, as using them can disrupt flash and PSRAM access.[1]
  • Input-only pins. GPIO34 to GPIO39 are input-only and have no internal pull-ups or pull-downs.[2]

Power and battery

2 facts
Supply
5 V via USB or the 5V pin, or 3.3 V on the 3V3 pin[1]
Deep sleep (chip)
About 10 µA with the RTC timer[2]

Use one power input only: USB, the 5V pin or the 3V3 pin. The board's USB bridge, regulator and LED draw far more than the chip in deep sleep, so battery projects use bare modules or low-quiescent boards.

History and use today

Editorial

History

The DevKitC is Espressif's own development board for the ESP32, whose first datasheet was published in August 2016.[2]

Still useful for

A good first ESP32 board: every pin is broken out, and it matches the generic “ESP32 Dev Module” setting in the Arduino core.

Sources

13 sources
  1. ESP32-DevKitC V4 user guide, Espressif
  2. ESP32 Series datasheet, Espressif
  3. GPIO & RTC GPIO (ESP32), ESP-IDF Programming Guide
  4. ESP-IDF Programming Guide, Espressif
  5. Arduino core for the ESP32, Espressif
  6. ESP32-WROOM-32E & ESP32-WROOM-32UE datasheet, Espressif
  7. ESP32-WROVER-E & ESP32-WROVER-IE datasheet, Espressif
  8. PlatformIO board definition (esp32dev) at 1152c8f691
  9. Zephyr board definition (esp32_devkitc) at 3c61a12bdd
  10. CircuitPython board definition (espressif_esp32_devkitc_v4_wroom_32e) at 83b54473a1
  11. CircuitPython board definition (espressif_esp32_devkitc_v4_wrover) at 83b54473a1
  12. MicroPython board definition (ESP32_GENERIC) at 19e685eca9
  13. CircuitPython pin definitions (espressif_esp32_devkitc_v4_wroom_32e) at 395b187017

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