LILYGO T-Watch S3 Plus

Version Iteration:

Purchase Links

Table of Contents

• Description
• Preview
• Modules
• Quick Start
• FAQ
• Projects
• Resources
• Dependent Libraries

Description

The T-Watch S3 Plus is an enhanced version based on the T-Watch S3, adding GPS functionality. It is a versatile smart wearable device that integrates high-performance hardware and wireless communication technologies, suitable for sports health monitoring, remote interaction, and audio scenarios. Its core configuration includes a 1.54-inch 240x240 high-definition LCD display, paired with a BMA423 axis sensor and a capacitive touch module, enabling precise motion tracking and responsive touch operations. It features a built-in Max98357A audio amplifier and a PDM microphone, supporting high-quality audio output and voice command input. Currently, the T-Watch S3 Plus has two LoRa versions, SX1262 and SX1280. Combined with the GPS module, it achieves precise positioning and long-range, low-power wireless communication, making it suitable for IoT and smart wearable scenarios.

Preview

Physical Image

Pin Diagram

Modules

MCU

• Chip: ESP32-S3
• PSRAM: 8M
• FLASH: 16M
• Other Notes: For more information, please visit the Espressif Official ESP32-S3 Datasheet

Display

• Size: 1.54-inch LCD
• Resolution: 240×240px
• Display Type: LCD
• Bus Communication Protocol: SPI

Touch

• Type: Capacitive Touchscreen
• Bus Communication Protocol: I2C

Sensors

• Axis Sensor: BMA423 (I2C)
• Motor Driver: DRV2605 (I2C)

Audio

• Audio Output: Max98357A (I2S)
• Audio Input: PDM Microphone

Communication Modules

• LoRa: SX1262/SX1280, supports 433~923MHz frequency bands
• GPS: Integrated GPS module
• Wi-Fi: 802.11 b/g/n
• Bluetooth: BLE 5.0

Power Management

• Chip: AXP2101 Highly Integrated Power Management Unit

Overview

✨ Hardware-Features

✨ Display-Features

📍 Pins Map

🧑🏼‍🔧 I2C Devices Address

⚡ PowerManage Channel

• BLDO1 as GPS power supply (with BOOT and RST buttons in the back shell)
• DC3 was originally used as a GPS power source (there were no BOOT and RST buttons on the back cover)

⚡ Electrical parameters

[!IMPORTANT]
⚠️ It is recommended to use a charging current below 130mA. Excessive charging current can damage the battery.
If not in use for an extended period, turn the battery switch to OFF.

⚡ Power consumption reference

• T-Watch-S3-Plus does not have a touch reset pin connected, so if you set the touch screen to sleep, the touch will not work.

Resource

• Motherboard-schematic
• GPS-schematic

Quick Start

Example Support

PlatformIO

1. Install Visual Studio Code, choose the version for your system.
2. Open the "Extensions" in the sidebar of Visual Studio Code (or use Ctrl+Shift+X), search for the "PlatformIO IDE" extension and install it.
3. While the extension is installing, you can go to GitHub to download the project code. You can download the main branch code by clicking the green "<> Code" button, or download the "Releases" version from the sidebar.
4. After the extension is installed, open the sidebar's Explorer (or use Ctrl+Shift+E), click "Open Folder", find the project code folder you just downloaded (the entire folder), click "Add". The project files will then be added to your workspace.
5. Open the "platformio.ini" file in the project folder (PlatformIO should automatically open the "platformio.ini" for the added folder). Under the "[platformio]" section, uncomment the line to select the example program you want to upload (identified by "default_envs = xxx"). Then click the "√" in the bottom left corner to compile. If the compilation is successful, connect the microcontroller to your computer and click the "→" in the bottom left corner to upload.

Arduino

1. Install Arduino IDE
2. Install Arduino ESP32 V3.3.0-alpha1 or later or latest

• Tips : Arduino manager URL: https://espressif.github.io/arduino-esp32/package_esp32_dev_index.json

3. Download LilyGoLib Library
4. Open Arduino IDE -> Sketch -> Include Library -> Add .ZIP Library -> Select the library compressed package downloaded in step 3
5. Install LilyGoLib-ThirdParty
   • Copy all directories in LilyGoLib-ThirdParty to ArduinoIDE libraries directory, if there is no libraries directory, please create it.
   • Please note that instead of copying the LilyGoLib-ThirdParty directory, copy the folders in the LilyGoLib-ThirdParty directory to libraries
   • How to find the location of your own libraries on your computer, please see here
     • Windows: C:\Users\{username}\Documents\Arduino
     • macOS: /Users/{username}/Documents/Arduino
     • Linux: /home/{username}/Arduino

Please note that the libraries in LilyGoLib-ThirdParty are not necessarily the latest versions. Please do not upgrade the versions of the dependent libraries before confirming that the hardware is running normally.

ArduinoIDE will prompt that there is a new version of the library to upgrade every time it is opened.
Please confirm that it is running normally before trying to update to the latest version. If you encounter problems, please roll back to the version of the dependent library that runs normally. The current list of dependent library versions can be viewed here

6. File -> Examples -> LilyGOLib -> helloworld
7. Tools -> Board -> esp32,Please select from the table below

8. Board Revision options, please select according to the actual RF type purchased. The current options are:
   • Radio-SX1262(Sub 1G LoRa)
   • Radio-SX1280(2.4G LoRa)
   • Radio-CC1101(Sub 1G (G)MSK, 2(G)FSK, 4(G)FSK, ASK, OOK)
   • Radio-LR1121(Sub 1G + 2.4G LoRa)
   • Radio-SI4432(Sub 1G ISM)
9. Select Port
10. Click upload , Wait for compilation and writing to complete
11. If you cannot upload sketch or the USB device keeps popping up on the computer, please manually put the device into download mode. How to enter download mode, please see the here

• If there is no message output from the serial port, please check whether USB CDC ON Boot is set to Enabled.
• Board Revision changes according to the actual RF module model. The current default version is SX1262
• This library depends on the latest arduino-esp32 version. If it is lower than V3.3.0-alpha1, an error will be reported.

T-Watch-S3-Plus Enter Download Mode

Download mode is only required when the program is not allowed to upload the sketch. This step is not required under normal circumstances.

🤖 T-Watch-S3-Plus the BOOT button and RST button have been reserved on the edge of the shell. Please follow the steps below to put the device into download mode.

1. Connect the board via the USB-C cable
2. Press and hold the BOOT button , While still pressing the BOOT button
3. Release the RST button
4. Release the BOOT button
5. The USB port should be fixed and will not flash again. You can click Upload.
6. Press the RST button to exit download mode

If the new code is successfully written, but the device does not light up or has other problems, please use our factory test code to test whether the peripherals can work properly. Please jump here to download the firmware and write it for testing.

Development Platforms

1. ESP-IDF
2. Arduino IDE
3. Platform IO
4. Micropython

FAQ

• Q. What is the main difference between the T-Watch S3 Plus and the T-Watch S3?
  A. The T-Watch S3 Plus adds GPS functionality to the T-Watch S3, while other hardware configurations remain largely the same.

• Q. How to turn on and off?
  A. Press and hold the POWER button for 2 seconds to turn on. Press and hold for 6 seconds to turn off. The BOOT button is an internal button used to enter download mode.

• Q. Which LoRa frequency bands are supported?
  A. Currently available in SX1262 and SX1280 versions, supporting 433MHz~923MHz frequency bands. Please choose the appropriate version according to the regulations in your region.

• Q. How to develop watch applications?
  A. It is recommended to use the TTGO_TWatch_Library, which provides rich watch UI components and sensor drivers for rapid application development.

• Q. What is the battery life like?
  A. Battery life depends on usage scenarios. Under normal usage, it can last for several days. Please refer to actual test data for specific duration.

Projects

• T-Watch S3 Plus

Resources

• ESP32-S3 Datasheet
• BMA423 Datasheet
• AXP2101 Datasheet
• (More resources please refer to the GitHub repository)

Dependent Libraries

• TTGO_TWatch_Library