DOIT ESPduino32
ESP32 dev board with Arduino Uno layout - combines Wi-Fi power with classic compatibility.
DOIT ESPduino32 Pinout
35 pins · 2.54 mm pitch| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | IO0 | strapping | - | |
| 2 | 1 | TX0PWM | uart | - | |
| 3 | 2 | LED_BUILTINIO2PWM | strapping | - | |
| 4 | 3 | RX0PWM | uart | - | |
| 5 | 4 | IO4PWM | safe | - | |
| 6 | 5 | IO5PWM | strapping | - | |
| 7 | 6 | CLKPWM | strapping | - | |
| 8 | 7 | SD0PWM | strapping | - | |
| 9 | 8 | SD1PWM | strapping | - | |
| 10 | 9 | SD2PWM | strapping | - | |
| 11 | 10 | SD3PWM | strapping | - | |
| 12 | 11 | CMDPWM | strapping | - | |
| 13 | 12 | IO12PWM | strapping | - | |
| 14 | 13 | IO13PWM | strapping | - | |
| 15 | 14 | IO14PWM | strapping | - | |
| 16 | 15 | IO15PWM | strapping | - | |
| 17 | 16 | IO16PWM | safe | - | |
| 18 | 17 | IO17PWM | safe | - | |
| 19 | 18 | IO18PWM | safe | - | |
| 20 | 19 | IO19PWM | safe | - | |
| 21 | 21 | SDAPWM | safe | i2c | |
| 22 | 22 | SCLPWM | safe | i2c | |
| 23 | 23 | IO23PWM | safe | - | |
| 24 | 25 | IO25PWM | safe | - | |
| 25 | 26 | IO26PWM | safe | - | |
| 26 | 27 | IO27PWM | safe | - | |
| 27 | 32 | IO32PWM | safe | - | |
| 28 | 33 | IO33PWM | safe | - | |
| 29 | 35 | IO35 | strapping | - | |
| 30 | 36 | IO36 | strapping | - | |
| 31 | 39 | IO39 | strapping | - | |
| 32 | 5 | SS | strapping | spi | |
| 33 | 23 | MOSI | safe | spi | |
| 34 | 19 | MISO | safe | spi | |
| 35 | 18 | SCK | safe | spi |
Start with these
16 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 · 11 things to knowIO0 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.
TX0GPIO1 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.
LED_BUILTINGPIO2 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.
RX0GPIO3 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.
IO5SSGPIO5 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.
- IO5Bootstrapping pin; internal pull-up; VSPI CS0 (default SPI chip-select); acts as FSPIWP (flash write-protect) on internal-flash variants.
- SSBootstrapping pin; internal pull-up; VSPI CS0 (default SPI chip-select); acts as FSPIWP (flash write-protect) on internal-flash variants.
IO12 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.
IO13 JTAG clock pin (TCK); also ADC2 channel 4 / Touch4 input. JTAG
Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed.
IO14 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.
IO15 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.
IO35IO39 Input-only GPIOs with ADC1 channels - no output driver Other
Cannot be used as output; only suitable for input.
- IO35Input-only GPIO (no output driver); ADC1 channel 7.
- IO39Input-only GPIO (no output); ADC1 channel 3, Hall sensor VN.
IO36 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 knowCLKGPIO6 Connected to SPI flash clock (SCK/CLK). Flash
Used for internal flash/PSRAM communication; not available for general GPIO.
SD0GPIO7SD1GPIO8 SPI flash data lines SD0 and SD1 Flash
Used for internal flash/PSRAM data; not available for general GPIO.
- SD0Connected to SPI flash data 0 (SD0).
- SD1Connected to SPI flash data 1 (SD1).
SD2GPIO9SD3GPIO10 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.
- SD2Connected to SPI flash/PSRAM data 2 (SD2, flash HOLD).
- SD3Connected 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.
All 35 pins on the DOIT ESPduino32 are usable GPIO, spaced at the standard 2.54 mm pitch.
Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO21 and SCL on GPIO22, while the SPI bus (MOSI, MISO, SCK, SS) is broken out in full.
13 of the exposed pins carry boot-time or system duties on the ESP32 (IO0, TX0, LED_BUILTIN and 10 more) - check the guidance above before wiring anything to them. IO4, IO16, IO17, IO18 and 12 more are free of any such role - the safest first picks.
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:esp32doit-espduino]
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).Specifications
ESP32 · 66 × 53.3 mm · vs other ESP32 chips →Dimensions
About this board
Inside sits the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
With 31 GPIO broken out, you get more pins to play with than most ESP32 boards offer.
Around the module: Reset buttons.
Resources
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