# LILYGO T-Watch S3 Plus

> ESP32-S3 smartwatch dev board with LoRa SX1262, GNSS, BMA423 accelerometer, MAX98357A audio, DRV2605 haptic feedback, AXP2101 PMIC, and 940mAh battery for wearable LoRa projects.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** dev-board
- **Price:** ~$58.74
- **Product Readiness:** developer
- **CPU:** Xtensa LX7 dual-core @ 240MHz, FPU, AI instructions
- **CPU Architecture:** Xtensa LX7
- **CPU Cores:** 2
- **RAM:** 512KB SRAM
- **PSRAM:** 8MB
- **Flash:** 16MB
- **USB:** USB-C
- **Power:** 5V + LiPo
- **Operating Voltage:** 3.3V
- **Battery:** 940mAh
- **Charging Port:** USB-C
- **Antenna:** Built-in PCB antenna

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 5.0
- **Lora:** SX1262 868/915MHz

## Open Source

- **Firmware:** Yes
- **Schematics:** No
- **PCB Layout:** No

## Certifications

CE, FCC

## Compatible Firmware

arduino, esp-idf, micropython, meshtastic

## Use Cases

- smart-watch
- asset-tracking
- lora-messenger

## Components

- **ESP32-S3** (mcu): Xtensa LX7 dual-core at 240MHz with 16MB flash, 8MB PSRAM, WiFi, and BLE 5.0. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)
- **SX1262** (radio): Long-range LoRa transceiver covering 150–960 MHz with +22 dBm output. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fsemtech.com%2Fuploads%2Fdocuments%2FDS_SX1261-2_V2.1.pdf&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)
- **BMA423** (accelerometer): 3-axis accelerometer with step counter, activity recognition, and wrist-tilt detection for smartwatch applications. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.bosch-sensortec.com%2Fmedia%2Fboschsensortec%2Fdownloads%2Fdatasheets%2Fbst-bma423-ds000.pdf&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)
- **MAX98357A** (audio-amplifier): Filterless 3.2W Class D amplifier with I2S interface for speaker audio output. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.analog.com%2Fmedia%2Fen%2Ftechnical-documentation%2Fdata-sheets%2FMAX98357A-MAX98357B.pdf&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)
- **DRV2605** (haptic): I2C haptic motor driver with 123 built-in waveforms for ERM and LRA actuators. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.ti.com%2Flit%2Fds%2Fsymlink%2Fdrv2605.pdf&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)
- **AXP2101** (battery-charger): Advanced PMIC with multi-rail LDO outputs, LiPo charging, and fuel gauge. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Watch-S3-Plus&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)

## Protocols

- **SPI**: CLK: GPIO3, MOSI: GPIO1, MISO: GPIO4
- **I2C**: SDA: GPIO10, SCL: GPIO11
- **I2S**: BCLK: GPIO44, WS: GPIO43, DOUT: GPIO45

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| GPIO10 | I2C SDA | I2C | digital-input, digital-output |
| GPIO11 | I2C SCL | I2C | digital-input, digital-output |

## Description

## Overview

The LILYGO T-Watch S3 Plus is an enhanced smartwatch development platform built around the ESP32-S3 with 16MB flash and 8MB PSRAM. Compared to the standard T-Watch S3, the Plus variant integrates LoRa (SX1262) and GPS for off-grid location-aware communication, enabling Meshtastic mesh networking directly from the wrist.

The wearable feature set includes a BMA423 accelerometer with step counter and activity recognition, MAX98357A Class-D audio amplifier for speaker output, DRV2605 haptic motor driver with 123 waveform effects, and a 940mAh LiPo battery managed by the AXP2101 PMIC with fuel gauging. A microphone is also onboard for voice interaction.

The combination of LoRa, GPS, and a complete wearable sensor suite makes the T-Watch S3 Plus ideal for Meshtastic wrist nodes, search-and-rescue trackers, and custom smartwatch firmware with off-grid messaging capabilities.

## Where to Buy

- [LILYGO Official](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-watch-s3-plus&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export) — $58.74

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-watch-s3-plus&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Watch-S3-Plus&ref=openhardware.directory&product=lilygo-t-watch-s3-plus&source=md-export)

## Tags

`esp32-s3`, `smartwatch`, `lora`, `gps`, `meshtastic`, `haptic`, `lilygo`

## Images

![LILYGO T-Watch S3 Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-s3-plus/5f3ec81c22cb.jpg)
![LILYGO T-Watch S3 Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-s3-plus/ae5145333f5c.jpg)
![LILYGO T-Watch S3 Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-s3-plus/cf63d4aca593.jpg)
![LILYGO T-Watch S3 Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-s3-plus/415ee437fc36.jpg)
![LILYGO T-Watch S3 Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-s3-plus/1920216a60ea.jpg)
![LILYGO T-Watch S3 Plus](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-s3-plus/aa15f39401df.png)

> **Battery Powered:** Li-Po

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