Espressif ESP32-DevKitC
Popular dev board with full ESP32 pin access - ideal for general-purpose prototyping and Arduino/ESP-IDF.
Espressif ESP32-DevKitC Pinout
38 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | A11T1PWM | strapping | adc · touch | |
| 2 | 1 | TXPWM | uart | uart | |
| 3 | 2 | A12T2PWM | strapping | adc · touch | |
| 4 | 3 | RXPWM | uart | uart | |
| 5 | 4 | A10T0PWM | safe | adc · touch | |
| 6 | 5 | PWM | strapping | - | |
| 7 | 12 | A15T5PWM | strapping | adc · touch | |
| 8 | 13 | A14T4PWM | strapping | adc · touch | |
| 9 | 14 | A16T6PWM | strapping | adc · touch | |
| 10 | 15 | A13T3PWM | strapping | adc · touch | |
| 11 | 16 | PWM | safe | - | |
| 12 | 17 | PWM | safe | - | |
| 13 | 18 | PWM | safe | - | |
| 14 | 19 | PWM | safe | - | |
| 15 | 21 | PWM | safe | - | |
| 16 | 22 | PWM | safe | - | |
| 17 | 23 | PWM | safe | - | |
| 18 | 25 | A18DAC1PWM | safe | adc · dac | |
| 19 | 26 | A19DAC2PWM | safe | adc · dac | |
| 20 | 27 | A17T7PWM | safe | adc · touch | |
| 21 | 32 | A4T9PWM | safe | adc · touch | |
| 22 | 33 | A5T8PWM | safe | adc · touch | |
| 23 | 34 | A6 | strapping | adc | |
| 24 | 35 | A7 | strapping | adc | |
| 25 | 36 | A0 | strapping | adc | |
| 26 | 39 | A3 | strapping | adc | |
| 27 | - | 3V33.3V | power | - | 3.3V power output from the on-board regulator |
| 28 | - | EN | control | - | Chip enable / reset (active LOW) - the same net as the EN button |
| 29 | - | GND | ground | - | Ground connection |
| 30 | 9 | D2GPIO9 | strapping | - | Wired to the module's SPI flash - do NOT use, the board will crash or fail to boot |
| 31 | 10 | D3GPIO10 | strapping | - | Wired to the module's SPI flash - do NOT use, the board will crash or fail to boot |
| 32 | 11 | CMDGPIO11 | strapping | - | Wired to the module's SPI flash - do NOT use, the board will crash or fail to boot |
| 33 | - | 5V5V0 | power | - | 5V from the USB connector - also the input when powering the board from here |
| 34 | - | GND | ground | - | Ground connection |
| 35 | - | GND | ground | - | Ground connection |
| 36 | 8 | D1GPIO8 | strapping | - | Wired to the module's SPI flash - do NOT use, the board will crash or fail to boot |
| 37 | 7 | D0GPIO7 | strapping | - | Wired to the module's SPI flash - do NOT use, the board will crash or fail to boot |
| 38 | 6 | CLKGPIO6 | strapping | - | Wired to the module's SPI flash - do NOT use, the board will crash or fail to boot |
Start with these
13 pins with no boot or system involvementFreely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
13 pins · 12 things to knowA11GPIO0 Bootstrapping pin (enter bootloader when low); internal pull-up. Strapping
Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode.
TXGPIO1 Default UART0 TX pin for USB-serial programming and console. UART
Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console.
A12GPIO2 Bootstrapping pin (must be low or floating at reset); internal pull-down. Strapping
If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure.
RXGPIO3 Default UART0 RX pin for USB-serial programming (console input). UART
Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads.
PWMGPIO5 Bootstrapping pin; internal pull-up; VSPI CS0 (default SPI chip-select); acts as FSPIWP (flash write-protect) on internal-flash variants. Strapping
Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot.
A15GPIO12 Bootstrapping pin; JTAG TDI; sets flash voltage (VDD_SDIO); also HSPIQ (flash data line). Strapping
Keep LOW during boot (internal PD); pulling HIGH at reset selects 1.8V flash mode, causing flash brownout if 3.3V flash is used.
A14GPIO13 JTAG clock pin (TCK); also ADC2 channel 4 / Touch4 input. JTAG
Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed.
A16GPIO14 JTAG mode select pin (TMS); also HSPI CLK and PWM-capable GPIO. JTAG
Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot.
A13GPIO15 Bootstrapping pin; JTAG TDO; controls UART0 boot log output; also HSPICS0 (secondary SPI CS). Strapping
Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change.
A6GPIO34 Input-only GPIO (no output driver); ADC1 channel 6. Other
Cannot be used as output (no drive capability); only suitable for analog/digital input.
A7GPIO35A3GPIO39 Input-only GPIOs with ADC1 channels - no output driver Other
Cannot be used as output; only suitable for input.
- A7Input-only GPIO (no output driver); ADC1 channel 7.
- A3Input-only GPIO (no output); ADC1 channel 3, Hall sensor VN.
A0GPIO36 Input-only GPIO (no output); ADC1 channel 0, Hall sensor VP. Other
Cannot be used as output; only suitable for input (e.g., analog read).
Only if you know the tricks
6 pins · 4 things to knowD2GPIO9D3GPIO10 SPI flash/PSRAM data lines SD2 and SD3 (flash HOLD and WP) Flash
Used by internal flash/PSRAM; typically not exposed on modules, avoid using as GPIO.
- D2Connected to SPI flash/PSRAM data 2 (SD2, flash HOLD).
- D3Connected to SPI flash/PSRAM data 3 (SD3, flash WP).
CMDGPIO11 Connected to SPI flash command/CS (CMD/CS0). Flash
Used by internal flash (chip select/command); not available for general use.
D1GPIO8D0GPIO7 SPI flash data lines SD0 and SD1 Flash
Used for internal flash/PSRAM data; not available for general GPIO.
- D1Connected to SPI flash data 1 (SD1).
- D0Connected to SPI flash data 0 (SD0).
CLKGPIO6 Connected to SPI flash clock (SCK/CLK). Flash
Used for internal flash/PSRAM communication; not available for general GPIO.
Across 38 pins (2.54 mm pitch), the Espressif ESP32-DevKitC exposes 32 GPIO plus 3V3, GND and 5V for power.
For peripherals, TX/RX on GPIO1 and GPIO3 cover serial logging and flashing.
On the analog side there are 16 ADC-capable pins for sensors and battery monitoring, 10 capacitive-touch inputs and 2 true DAC outputs.
If you want zero surprises, A10, PWM, PWM, PWM and 9 more are free of any such role - the safest first picks. 13 of the exposed pins carry boot-time or system duties on the ESP32 (A11, TX, A12 and 10 more).
Getting started
flash your first firmware in ~2 minutesBoard: ESP32 Dev Module Flash Size: 4MB (32Mb) Flash Mode: DIO Partition Scheme: Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS) Upload Speed: 921600
// toggle GPIO4 - wire an LED and resistor to it
void setup() {
pinMode(4, OUTPUT);
}
void loop() {
digitalWrite(4, HIGH); delay(500);
digitalWrite(4, LOW); delay(500);
}[env:esp32-devkitc]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32dev - or type it after board =.esp32:
board: esp32dev
variant: esp32
framework:
type: esp-idf
# blink - GPIO4
output:
- platform: gpio
pin: 4
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesp32dev (same ids as PlatformIO).esptool.py --chip esp32 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x1000 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Downloads
Free for non-commercial use, credit espboards.dev · License
Board illustration
The bare Espressif ESP32-DevKitC board drawn to scale at 54.4 × 27.9 mm, with no pin labels on it. Made for slide decks, wiring diagrams and project write-ups where a photo is too busy. Take the scalable SVG for print or editing, the high-resolution PNG to drop straight in, or the transparent PNG when you need it with no background behind it.
Pinout diagram
Every pin on both sides of the board with its functions, drawn by ESPboards from the ESP32 Series Datasheet v5.3 - the same sheet shown at the top of this page. The PNG is a high-resolution image for screens, the SVG is vector so it stays sharp at any size, and the PDF is laid out to print on A4 or Letter.
Yours to use, share and adapt for non-commercial work, as long as you credit espboards.dev - the full terms and ready-made credit lines are here.
Specifications
ESP32 · 54.4 × 27.9 mm · vs other ESP32 chips →Dimensions
About this board
At its core is the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
Expect to pay about $10.00 - less than the ~$20 most ESP32 boards go for.
32 GPIO are broken out - more than most ESP32 boards, so the pin budget is rarely the constraint.
Onboard you'll find Reset/Boot buttons.
- PCB antenna (ESP32-WROOM-32); WROOM-32U/32UE variants swap it for a u.FL external antenna connector
- Also sold in ESP32-WROVER-E/IE variants that add 8MB PSRAM
Where to buy
prices are typical street pricesResources
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