T-Watch S3 Plus get it now

Overview

T-Watch S3 Plus is an enhanced version of T-Watch S3, adding GPS functionality to create a multifunctional smart wearable device. Features a 1.3-inch ST7789V3 IPS LCD (240 × 240), MIA-M10Q GNSS, SX1262/SX1280 LoRa (433–923 MHz), BMA423 3-axis sensor, FT6336U capacitive touch, Max98357A audio amplifier, PDM microphone, DRV2605 haptic motor, and AXP2101 PMU. 1500 mAh battery. 51.5 × 42 × 20 mm (without strap).

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
Factory Program	✓		Factory example
LilyGoLib Examples	✓		Watch UI, sensor, LoRa, GPS examples

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Clone the LilyGoLib repository
4. Open platformio.ini and under [platformio] uncomment the desired environment
5. Click ✓ to compile, click → to upload

Arduino

1. Install Arduino IDE
2. Install Arduino ESP32 V3.3.0-alpha1 or higher
   • Boards Manager URL: https://espressif.github.io/arduino-esp32/package_esp32_dev_index.json
3. Download LilyGoLib and install via Sketch → Include Library → Add .ZIP Library
4. Copy all directories from LilyGoLib-ThirdParty into your Arduino libraries folder
5. In Tools → Board, configure:

Arduino IDE Setting	Value
Board	LilyGo T-Watch-S3
Upload Speed	921600
USB Mode	UART0/Hardware CDC
USB CDC On Boot	Enabled
USB Firmware MSC On Boot	Disabled
USB DFU On Boot	Disabled
CPU Frequency	240 MHz (WiFi)
Core Debug Level	None
Partition Scheme	16M Flash (3MB APP/9.9MB FATFS)
Board Revision	Radio-SX1262 (or per your RF module)
Arduino Runs On	Core 1
Events Run On	Core 1

Board Revision options: Radio-SX1262 / Radio-SX1280 / Radio-CC1101 / Radio-LR1121 / Radio-SI4432

6. Click Upload

If upload fails, manually enter download mode: connect via USB-C → hold BOOT → press RST → release RST → release BOOT → upload → press RST to exit.

Development Platforms

1. PlatformIO
2. Arduino IDE
3. ESP-IDF
4. MicroPython

Video

Key Features

• ESP32-S3 @ 240 MHz, 16 MB Flash, 8 MB OPI PSRAM, Wi-Fi + BT 5.0
• 1.3-inch ST7789V3 IPS LCD (240 × 240), FT6336U capacitive touch
• SX1262/SX1280 LoRa, MIA-M10Q GNSS, BMA423 accelerometer, DRV2605 haptic
• MAX98357A audio + PDM mic, PCF8563 RTC, AXP2101 PMU, 1500 mAh, 51.5 × 42 × 20 mm

Product Parameters

Feature	Specification
MCU	ESP32-S3 @ Dual-core LX7, 240 MHz
Flash	16 MB (QSPI)
PSRAM	8 MB (OPI)
Wi-Fi	2.4 GHz 802.11 b/g/n
Bluetooth	Bluetooth 5.0 LE
Display	1.3-inch ST7789V3 IPS LCD, 240 × 240 (SPI)
Touch	FT6336U Capacitive (I2C, Wire1)
GNSS	UBlox MIA-M10Q
LoRa	SX1262 / SX1280, 433–923 MHz (selectable)
Accelerometer	BMA423 (I2C)
RTC	PCF8563
Power Management	AXP2101
Audio Output	MAX98357A (I2S, 3.2 W Class D)
Audio Input	PDM Microphone (SPM1423HM4H-B)
Haptic Motor	DRV2605 (I2C)
IR Emitter	IR12-21C
Battery	3.7 V, 1500 mAh (5.55 Wh)
Charging Input	USB-C, 3.9–6 V
USB	1 × Micro USB + OTG
Buttons	POWER (hold 2 s on / 6 s off) + BOOT (built-in)
Dimensions	51.5 × 42 × 20 mm (without strap)

Pin Diagram

Pin Mapping

Name	GPIO
I2C SDA	10
I2C SCL	11
Touch (FT6336U) SDA	39
Touch (FT6336U) SCL	40
Touch (FT6336U) Interrupt	16
RTC (PCF8563) Interrupt	17
BMA423 Interrupt	14
MAX98357A BCLK	48
MAX98357A WCLK	15
MAX98357A DOUT	46
GNSS (MIA-M10Q) TX	42
GNSS (MIA-M10Q) RX	41
LoRa SCK	3
LoRa MISO	4
LoRa MOSI	1
LoRa Reset	8
LoRa BUSY	7
LoRa CS	5
LoRa Interrupt	9
Display CS	12
Display MOSI	13
Display SCK	18
Display DC	38
Display Backlight	45
AXP2101 Interrupt	21
PDM Mic SCK	44
PDM Mic DATA	47
IR Emitter	2

Dimension Diagram

Schematic

• T-Watch S3 Schematic

Datasheet

• ESP32-S3 Datasheet
• BMA423 Datasheet

Software Development

• LilyGoLib GitHub Repository
• TTGO_TWatch_Library GitHub Repository

Dependent Libraries

• LilyGoLib
• LilyGoLib-ThirdParty
• TTGO_TWatch_Library

FAQ

• Q. What is the main difference between T-Watch S3 Plus and T-Watch S3? A. T-Watch S3 Plus adds GPS (MIA-M10Q) functionality. Other hardware configurations are essentially the same.

• Q. How to power on and off? A. Press and hold the POWER button for 2 seconds to power on, hold for 6 seconds to power off.

• Q. Which LoRa versions are available? A. SX1262 (Sub-GHz, 433–923 MHz) and SX1280 (2.4 GHz). Select via the Board Revision setting in Arduino IDE.

• Q. Why does my board keep failing to upload programs? A. Enter download mode: hold BOOT, press RST, release RST, release BOOT, then upload. Press RST to exit.

• Q. No serial output? A. Ensure USB CDC On Boot is set to Enabled.

Version History

Version	Release Date	Update Description
T-Watch-S3-Plus V1.0	2024-01-01	Initial version with GPS functionality