WiFiduino32S3
An ESP32-S3-based board designed for Arduino compatibility, offering Wi-Fi and Bluetooth connectivity for various projects.
WiFiduino32S3 Pinout
44 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | BOOT | strapping | - | ESP32-S3 BOOT signal |
| 2 | - | IOREF | power | - | Logic reference voltage |
| 3 | - | RESET | control | - | Reset |
| 4 | - | +3V3 | power | - | 3.3V output |
| 5 | - | +5V | power | - | 5V output |
| 6 | - | GND | ground | - | |
| 7 | - | GND | ground | - | |
| 8 | - | VIN | power | - | VIN power input |
| 9 | 0 | A0 | strapping | - | GPIO0 (boot strapping) - not ADC/touch capable on ESP32-S3 |
| 10 | 1 | A1 | safe | adc · touch | |
| 11 | 2 | A2 | safe | adc · touch | |
| 12 | 3 | A3 | strapping | adc · touch | |
| 13 | 4 | A4SDA | safe | adc · touch · i2c | |
| 14 | 5 | A5SCL | safe | adc · touch · i2c | |
| 15 | - | NC | safe | - | Not populated |
| 16 | - | NC | safe | - | Not populated |
| 17 | - | NC | safe | - | Not populated |
| 18 | - | NC | safe | - | Not populated |
| 19 | - | NC | safe | - | Not populated |
| 20 | - | NC | safe | - | Not populated |
| 21 | - | NC | safe | - | Not populated |
| 22 | - | NC | safe | - | Not populated |
| 23 | 39 | D13 | strapping | - | |
| 24 | 38 | D12 | safe | - | |
| 25 | 40 | ~D11 | strapping | pwm | |
| 26 | 41 | ~D10 | strapping | pwm | |
| 27 | 42 | ~D9 | strapping | pwm | |
| 28 | 21 | D8 | safe | - | |
| 29 | 17 | D7 | safe | adc | |
| 30 | 18 | ~D6 | safe | adc · pwm | |
| 31 | 48 | ~D5 | strapping | pwm | Shared with the onboard RGB LED (WS2812) on GPIO48 |
| 32 | 47 | D4 | strapping | - | |
| 33 | 46 | ~D3 | strapping | pwm | |
| 34 | 45 | D2 | strapping | - | |
| 35 | 43 | D1TX | uart | uart | |
| 36 | 44 | D0RX | uart | uart | |
| 37 | - | NC | safe | - | Not populated |
| 38 | - | NC | safe | - | Not populated |
| 39 | - | NC | safe | - | Not populated |
| 40 | - | NC | safe | - | Not populated |
| 41 | - | AREF | safe | - | Analog reference |
| 42 | - | GND | ground | - | |
| 43 | 4 | SDA | safe | i2c · adc · touch | |
| 44 | 5 | SCL | safe | i2c · adc · touch |
Start with these
10 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 knowBOOTGPIO0A0GPIO0 Bootstrapping pin (Chip boot mode selection) Strapping
Must be pulled high (default) or low (to enter UART download mode) at reset. Using it for other functions can interfere with boot mode configuration.
- BOOTBootstrapping pin (Chip boot mode selection)
- A0Bootstrapping pin (Chip boot mode selection)
A3GPIO3 Bootstrapping pin (controls JTAG signal source) Strapping
Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface.
D13GPIO39 JTAG test clock (MTCK); IO MUX alternates CLK_OUT3 and SUBSPICS1 (chip select on the alternative SUBSPI memory bus, unused on standard modules) JTAG
Default JTAG TCK - keep it free if you debug over JTAG. It is not a flash or PSRAM line on standard modules: those sit on GPIO26-37.
~D11GPIO40 JTAG test data out pin (MTDO) JTAG
Default JTAG TDO output for debugging. Using it as GPIO will interfere with JTAG debugging functionality.
~D10GPIO41 JTAG test data in pin (MTDI) JTAG
Default JTAG TDI input for debugging. Should be reserved for JTAG or left unused if JTAG is to remain available.
~D9GPIO42 JTAG test mode select pin (MTMS) JTAG
Default JTAG TMS signal for debugging. Using this pin for other purposes will disable the JTAG interface (unless JTAG is rerouted to USB).
~D5GPIO48D4GPIO47 Octal SPI differential clock legs (SPICLK_P/N_DIFF), used only by the 1.8 V octal flash/PSRAM variants Other
Only the 1.8 V octal parts (ESP32-S3R8V, ESP32-S3R16V) run the differential memory clock here, and on those the pin works at 1.8 V instead of 3.3 V. On the common 3.3 V modules it is a normal GPIO - several devkits drive their RGB LED from GPIO48.
- ~D5Octal SPI differential clock negative leg (SPICLK_N_DIFF), used only by the 1.8 V octal flash/PSRAM variants
- D4Octal SPI differential clock positive leg (SPICLK_P_DIFF), used only by the 1.8 V octal flash/PSRAM variants
~D3GPIO46 Bootstrapping pin (used with GPIO0 for boot mode; controls ROM log output) Strapping
Must be at a defined level during reset (with GPIO0) to select normal or download boot and UART/USB print mode. This pin is input-only (no output drive), so it should be left for its intended strapping function.
D2GPIO45 Bootstrapping pin (selects VDD_SPI flash voltage) Strapping
Determines flash/PSRAM power voltage (3.3 V vs 1.8 V) at boot. Must match hardware configuration; using as GPIO can upset flash supply setting.
D1GPIO43 UART0 transmit pin (U0TXD), default serial console TX UART
Used for bootloader output and UART console logs. If repurposed, you will lose the default serial output (and programming via UART0).
D0GPIO44 UART0 receive pin (U0RXD), default serial console RX UART
Used for bootloader input (download mode via serial). If repurposed, you cannot use the default UART0 download mode for programming the chip.
Across 44 pins (2.54 mm pitch), the WiFiduino32S3 exposes 23 GPIO plus IOREF, +3V3, +5V, GND and VIN for power.
Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO4 and SCL on GPIO5, while TX/RX on GPIO43 and GPIO44 cover serial logging and flashing.
Beyond plain digital I/O you get 9 ADC-capable pins for sensors and battery monitoring, PWM on 6 pins and 7 capacitive-touch inputs.
13 of the exposed pins carry boot-time or system duties on the ESP32-S3 (BOOT, A0, A3 and 10 more) - check the guidance above before wiring anything to them. A1, A2, A4, A5 and 6 more are free of any such role - the safest first picks.
Getting started
flash your first firmware in ~2 minutesBoard: ESP32S3 Dev Module Flash Size: 16MB (128Mb) Flash Mode: DIO PSRAM: OPI PSRAM Partition Scheme: 16M Flash (3MB APP/9.9MB FATFS) Upload Speed: 921600
// toggle GPIO1 - wire an LED and resistor to it
void setup() {
pinMode(1, OUTPUT);
}
void loop() {
digitalWrite(1, HIGH); delay(500);
digitalWrite(1, LOW); delay(500);
}[env:wifiduino32s3]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600
board_build.arduino.memory_type = qio_opi
build_flags = -DBOARD_HAS_PSRAMesp32-s3-devkitc-1 - or type it after board =.esp32:
board: esp32-s3-devkitc-1
variant: esp32s3
framework:
type: esp-idf
psram:
mode: octal
speed: 80MHz
# blink - GPIO1
output:
- platform: gpio
pin: 1
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesp32-s3-devkitc-1 (same ids as PlatformIO).esptool.py --chip esp32s3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Specifications
ESP32-S3 · 68.6 × 53.4 mm · vs other ESP32 chips →Dimensions
About this board
Inside sits the ESP32-S3 - a dual-core Xtensa with vector extensions suited to AI workloads.
Around the module: 8MB (OPI) PSRAM, an addressable RGB LED (GPIO48), status LEDs (Power, TX, RX, User, RGB) and Reset buttons.
- Also sold with 8MB flash (N8R8 module)
Resources
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