# LILYGO T-Watch 2021

> Programmable ESP32 smartwatch with 1.3-inch round GC9A01 IPS touchscreen (240×240), BMA423 accelerometer, vibration motor, RTC, WiFi, and BLE 4.2 — open-source and fully programmable with Arduino or MicroPython.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** ESP32
- **Price:** ~$25.62
- **Product Readiness:** developer
- **CPU:** ESP32
- **CPU Architecture:** Xtensa LX6 dual-core
- **PSRAM:** 2MB
- **Flash:** 4MB
- **USB:** Micro-USB (via T-U2T programmer)
- **Power:** 5V + LiPo
- **Operating Voltage:** 3.3V
- **Display:** 1.3" IPS LCD (round) 240×240

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 4.2

## Open Source

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

## Compatible Firmware

arduino, micropython, platformio

## Use Cases

- smart-watch
- wearable
- iot
- fitness-tracker

## Components

- **ESP32** (mcu): Dual-core Xtensa LX6 processor running at 240MHz with integrated WiFi and Bluetooth 4.2/BLE. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-watch-2021&source=md-export)
- **GC9A01** (display): 1.3-inch round IPS LCD with capacitive touch at 240×240 resolution. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.buydisplay.com%2Fdownload%2Fic%2FGC9A01A.pdf&ref=openhardware.directory&product=lilygo-t-watch-2021&source=md-export)
- **BMA423** (sensor): Three-axis accelerometer with built-in pedometer, step counter, and activity recognition. — [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-2021&source=md-export)

## Protocols

- **UART**
- **SPI**
- **I2C**
- **I2S**
- **CAN**
- **SDIO**

## Description

## Overview

The LILYGO T-Watch 2021 is an open-source programmable smartwatch based on the ESP32 microcontroller. It features a 1.3-inch round GC9A01 IPS LCD with capacitive touch at 240×240 resolution, a BMA423 three-axis accelerometer with pedometer functionality, a vibration motor for haptic feedback, and an onboard RTC for timekeeping. With 4MB Flash and 2MB PSRAM, it supports WiFi 802.11 b/g/n and Bluetooth 4.2/BLE connectivity. The watch is programmable via Arduino or MicroPython and supports a wide range of bus interfaces including UART, SPI, I2C, CAN, I2S, and SDIO, making it a versatile platform for custom smartwatch firmware, wearable IoT applications, and health-tracking experiments.

## Where to Buy

- [LILYGO Official](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-watch-2021&ref=openhardware.directory&product=lilygo-t-watch-2021&source=md-export) — $25.62

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-watch-2021&ref=openhardware.directory&product=lilygo-t-watch-2021&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Watch-2021&ref=openhardware.directory&product=lilygo-t-watch-2021&source=md-export)

## Tags

`esp32`, `smartwatch`, `wearable`, `iot`, `arduino`, `micropython`, `ble`, `wifi`

## Images

![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/784af6ea4cc9.jpg)
![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/a16088312027.jpg)
![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/75b2535fb96d.jpg)
![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/bb20553638da.jpg)
![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/7e6a322800ab.jpg)
![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/0062d12c5917.jpg)
![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/53022238673b.jpg)
![LILYGO T-Watch 2021](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-2021/aa15f39401df.png)

> **Battery Powered:** Li-Po

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