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WiFiduino32S3
An ESP32-S3-based board designed for Arduino compatibility, offering Wi-Fi and Bluetooth connectivity for various projects.
68.6 × 53.4 mm
ESP32-S3
MCU
240MHz
clock
16MB
flash
512KB
SRAM
20· 7 ADC
GPIO
BLE 5.0+ WiFi
radio
Pinout
44 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | BOOT | safe | - | ESP32-S3 BOOT signal |
| 2 | - | IOREF | power | - | Logic reference voltage |
| 3 | - | RESET | safe | - | 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 | strapping | - | |
| 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 | strapping | uart | |
| 36 | 44 | D0RX | strapping | 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
9 pins with no boot or system involvementA1A2A4SDAA5SCLD8D7~D6SDASCL
Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| A0 | GPIO0 | 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. | Strapping |
| A3 | GPIO3 | Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface. | Strapping |
| D13 | MTCK (GPIO39) | Default JTAG debugging TCK pin. If JTAG is needed, this pin must be free; it may also be used internally for PSRAM chip select on certain modules, so avoid repurposing it. | Other |
| ~D11 | MTDO (GPIO40) | Default JTAG TDO output for debugging. Using it as GPIO will interfere with JTAG debugging functionality. | Other |
| ~D10 | MTDI (GPIO41) | Default JTAG TDI input for debugging. Should be reserved for JTAG or left unused if JTAG is to remain available. | Other |
| ~D9 | MTMS (GPIO42) | Default JTAG TMS signal for debugging. Using this pin for other purposes will disable the JTAG interface (unless JTAG is rerouted to USB). | Other |
| ~D3 | GPIO46 | 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. | Strapping |
| D2 | GPIO45 | 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. | Strapping |
| D1 | U0TXD (GPIO43) | Used for bootloader output and UART console logs. If repurposed, you will lose the default serial output (and programming via UART0). | Other |
| D0 | U0RXD (GPIO44) | Used for bootloader input (download mode via serial). If repurposed, you cannot use the default UART0 download mode for programming the chip. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| D12 | FSPIWP | On flash-equipped chips, this pin is tied to the flash’s WP# (or D3) line. It should be avoided for other use, as it’s needed for flash operations. | Flash |
| ~D5 | SPICLK_N | Used only on variants with Octal SPI interface, as the negative leg of the differential clock&. On such chips it operates at 1.8 V; it should be avoided for GPIO to prevent conflicts with the octal flash/PSRAM clock. | Flash |
| D4 | SPICLK_P | Used only on variants with Octal SPI interface (e.g. ESP32-S3R16V) as part of the differential clock pair. On such chips it operates at 1.8 V and is reserved for the high-speed octal SPI clock, not for general GPIO use. | Flash |
These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.
Pinout notes Across 44 pins (2.54 mm pitch), the WiFiduino32S3 exposes 22 GPIO plus IOREF , +3V3 , +5V , GND and VIN for power. Peripheral wiring is straightforward: I²C is…
Across 44 pins (2.54 mm pitch), the WiFiduino32S3 exposes 22 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.
10 of the exposed pins carry boot-time or system duties on the ESP32-S3 (A0, A3, D13 and 7 more) - check the guidance above before wiring anything to them. A1, A2, A4, A5 and 5 more are free of any such role - the safest first picks.
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Install your USB-serial driver (CH340 / CP210x) if no port appears. Not detected? Hold BOOT while plugging in.
2
Match & flash
Set the Tools options shown, then click Upload.
3
Verify it runs
The onboard LED on GPIO1 blinks - swap the pin if your board's LED differs.
Set these in Tools · leave everything else at default
Arduino IDE 2.x — Tools Copy
Board: "ESP32S3 Dev Module"▸
Flash Size: "16MB (128Mb)"▸
Flash Mode: "DIO"▸
PSRAM: "OPI PSRAM"▸
Partition Scheme: "16M Flash (3MB APP / 9.9MB FATFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option — leave at default
Board: 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
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32S3 Dev Module
// blink the onboard LED
void setup() {
pinMode(1, OUTPUT);
}
void loop() {
digitalWrite(1, HIGH); delay(500);
digitalWrite(1, LOW); delay(500);
}board to selectesp32-s3-devkitc-1⧉ copy
[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_PSRAMFind it: PlatformIO Home ▸ Boards, search
esp32-s3-devkitc-1 — or type it after board =.board to selectesp32-s3-devkitc-1⧉ copy
esp32:
board: esp32-s3-devkitc-1
variant: wifiduino32s3
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_outFind it: search ESPHome's board list for
esp32-s3-devkitc-1 (same ids as PlatformIO).esptool doesn't pick board settings — a prebuilt .bin already has them baked in. This is just the raw flash command.
esptool.py --chip esp32s3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32-S3 · 68.6 × 53.4 mmCompute
MCU
ESP32-S3
Clock
240 MHz
SRAM · Flash
512 KB · 16MB · 8MB (OPI) PSRAM
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
20 · 7
UART · I²C · SPI
3 · 2 · 4
PWM
8 channels
Power
USB
USB-C
Serial
-
Boot address
0x0
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · QIO
Sketch · Data
1.25 MB · 320 KB
68.6 × 53.4 mm · pin pitch 2.54 mm
The WiFiduino32S3 uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with QIO boot mode. The maximum sketch size is 1.25 MB with 320 KB available for data.
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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