XIAO ESP32S3 · WebSerial Lab

ESP32S3 Sense · LSM6DS3 IMU · SSD1306 0.42" OLED · SD File Manager · ESP Web Tools Flash

Connection (WebSerial)

Baud Rate:

IMU (LSM6DS3)

AX	—	AY	—	AZ	—
GX	—	GY	—	GZ	—

Temp: —°C

OLED (72×40 · 0.42")

Zoom:

Display Mode:

Quick Commands

Quick:

Uses esptool-js v0.5.7 to flash via WebSerial directly from the browser. If serial monitor is connected it will be released automatically before flashing and reconnected after. Requires HTTPS or localhost.

⚠ MUST REFRESH WEBPAGE FIRST, then: then replug ESP32 after and re-connect. Arduino IDE must be closed or using a different port.

Option A — Sketch Only (.bin)

Flash only the application partition at 0x10000. Fast. Preserves bootloader and NVS. Use when the bootloader is already on the device.

File: Address:
Default: esp32_web_tool_test10.ino.bin — browse to override

Option B — Full / Merged Flash (.bin)

Flash a merged binary combining bootloader, partition table, and app. Use for fresh chips.

File: Address:
Default: esp32_web_tool_test10.ino.merged.bin → 0x0 — browse to override

Locating .bin Files (Arduino IDE 2.x)

Enable: File → Preferences → Show verbose output during: compilation
The build path is printed in the compilation log.

Option A — Sketch only (bootloader already on device):
YourSketch.ino.bin → 0x10000

Option B — Single merged binary (fresh chip):
YourSketch.ino.merged.bin → 0x0
(Arduino IDE 2.x: Sketch → Export Compiled Binary)

Stream: Temp: —°C

Accel X (m/s²)	Accel Y (m/s²)	Accel Z (m/s²)
—	—	—
Gyro X (°/s)	Gyro Y (°/s)	Gyro Z (°/s)
—	—	—

Values from LSM6DS3 via Seeed Arduino LSM6DS3 library. Accel in m/s² (gravity ≈ 9.8). Gyro in degrees/second.

📷 Press Capture to take a photo.
Image transfers over serial as base64.
240×240 ~3–8 KB · ~1–2s (tinyML default)

Capturing...

Resolution:

Quality (4=best, 63=worst): 12

SD Save Path:

Stream interval:

Connect device to enable camera

Connect device — then press Record 0.0s

0:00 / 0:00

Duration (s): 3s

Gain: ×2

Sample Rate:

SD Save Path:

Connect device to enable microphone

Tests the 11 user GPIO pads (D0–D10) on the XIAO ESP32S3.
Each pin is read twice: once with INPUT_PULLUP (internal pull to 3.3V) and once with INPUT_PULLDOWN (internal pull to GND).
A floating / open pin reads HIGH with pullup and LOW with pulldown — that is normal.
A pin shorted to GND stays LOW with pullup. A pin tied to 3.3V stays HIGH with pulldown.

Connect the device, then press Scan All Pins.

Reading guide:
PULLUP=1, PULLDOWN=0 → ✓ Floating / unconnected (normal)
PULLUP=0, PULLDOWN=0 → ⚠ Pin pulled/shorted to GND
PULLUP=1, PULLDOWN=1 → ⚠ Pin pulled/shorted to 3.3V
PULLUP=0, PULLDOWN=1 → ✗ Unexpected — check wiring

XIAO ESP32S3 GPIO map:
D0=GPIO1 · D1=GPIO2 · D2=GPIO3 · D3=GPIO4 · D4=GPIO5 · D5=GPIO6
D6=GPIO43(TX) · D7=GPIO44(RX) · D8=GPIO7 · D9=GPIO8 · D10=GPIO9

SD Card File Browser

Connect device then press ⟳ Refresh

— no file selected —

—

Click a file to open it