LILYGO T-Watch 2021

Overview

The LILYGO T-Watch 2021 is an open-source ESP32 smartwatch designed for firmware developers and IoT enthusiasts. It features a 1.3-inch round GC9A01 IPS LCD with capacitive touch at 240x240 resolution, housed in a wristwatch form factor.

The BMA423 three-axis accelerometer provides hardware pedometer functionality and gesture detection, while an onboard vibration motor enables haptic feedback. A real-time clock (RTC) maintains accurate time independently of the processor, and a power detection circuit monitors battery health. The watch connects to a computer for programming via USB Type-C.

Supported interfaces include UART, SPI, I2C, CAN, I2S, and SDIO, giving developers flexibility to extend the watch with external sensors and peripherals. The T-Watch 2021 is compatible with the T-U2T USB-to-serial downloader when the native USB interface is not sufficient.

Firmware Compatibility

The T-Watch 2021 is supported by the Arduino IDE with the ESP32 Arduino core. LILYGO's T-Watch-2021 GitHub repository provides a hardware abstraction library (LILYGO T-Watch Library) with examples for display, touch, accelerometer, RTC, and power management. ESP-IDF can also be used for bare-metal development.

Flashing Guide

1. Connect via USB Type-C cable to a computer.
2. Install required drivers if not automatically detected.
3. In Arduino IDE, install the ESP32 board package and LILYGO T-Watch Library.
4. Select the appropriate ESP32 board variant.
5. Open an example sketch from the T-Watch-2021 repository and upload.
6. Alternatively, use the T-U2T downloader if USB is not available.