T-Watch 2019 get it now

Overview

T-Watch 2019 is a powerful, feature-rich smartwatch platform based on ESP32. It combines a high-quality display, multiple sensors, and wireless connectivity into a compact wearable device. With an integrated power management unit and various optional peripherals, the T-Watch is ideal for IoT projects, fitness tracking, and custom smartwatch applications. The library provides complete hardware drivers, LVGL graphics framework integration, and extensive examples to get you started quickly.

Quick Start

Hardware Assembly

The T-Watch is pre-assembled. No soldering required for basic usage. For expansion modules, refer to the specific module documentation.

Arduino

1. Install the Arduino IDE
2. Download the library from GitHub
3. Install via Sketch → Include Library → Add .ZIP Library
4. Select your T-Watch model in config.h of each example
5. Select TTGO T-Watch as the board in Arduino IDE
6. Upload the sketch

ESP-IDF

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Key Features

• Multiple Display Options: 1.54" 240×240 touchscreen (ST7789V) across various versions
• Rich Sensor Suite: Includes IMU (BMA423), RTC (PCF8563), and optional GPS, microphone, and infrared sensor depending on version
• Power Management: Integrated AXP202 power management unit for battery operation
• Wireless Connectivity: Bluetooth and WiFi via ESP32
• Extensive Libraries: Pre-built drivers for all hardware components
• LVGL Graphics Support: LVGL 7.7.2 framework for rich UI development
• Modular Design: Optional expansion modules for GPS, audio, and other peripherals
• Multiple Variants: Supports T-Watch 2019, 2020 (V1/V2/V3), and newer versions

Specifications

Parameter	Value
SOC	ESP32 (D0WDQ6)
Flash	4–8 MB (variant dependent)
PSRAM	16 MB
Wireless	WiFi 802.11b/g/n, Bluetooth 4.2
Display	1.54" 240×240 ST7789V TFT LCD
Touchscreen	Capacitive FT6336
IMU	BMA423 (some versions), MPU6050 (T-Block)
RTC	PCF8563
Power Management	AXP202
Weight	~85g (with band)
Package Size	45 × 45 × 15 mm (watch body)

Pin Diagram

Display

Chip	BL	RESET	SCK	MOSI	MISO	CS	DC
ESP32	GPIO12	GPIO5	GPIO18	GPIO19	GPIO23	GPIO27	GPIO33

Touch Panel

Chip	SDA	SCL	INT
FT6336	GPIO21	GPIO22	GPIO38

IMU (BMA423)

Chip	SDA	SCL	INT
BMA423	GPIO21	GPIO22	GPIO39

Power Management (AXP202)

Chip	SDA	SCL	INT
AXP202	GPIO21	GPIO22	GPIO35

RTC (PCF8563)

Chip	SDA	SCL
PCF8563	GPIO21	GPIO22

Optional Peripherals

Dimensions

Schematic

Datasheet

• ESP32 Datasheet
• ST7789V Display Controller
• FT6336 Touchscreen Controller
• BMA423 IMU Sensor
• AXP202 Power Management IC

Software Libraries

• TTGO T-Watch Library - Official Arduino library with drivers and examples
• TFT_eSPI - Display driver library (already included)
• LVGL - Graphics framework (v7.7.2 integrated)
• My-TTGO-Watch - Community custom firmware
• lunokjod/watch - Alternative watch OS implementation

FAQ

Q: The library only supports esp-idf core 3.0 and below. Why?
A: The hardware drivers are optimized for older ESP-IDF versions. Core 2.0.14 is recommended for best compatibility.

Q: Upload fails with "Failed to write to target RAM"?
A: Change the upload baud rate in Arduino IDE from 115200 to 921600.

Q: How do I select the correct T-Watch variant?
A: Open config.h in each example and uncomment the line matching your hardware version (LILYGO_WATCH_2020_V1, V2, V3, etc.).

Q: Can I use the T-Watch without the library?
A: Yes, the library is optional. However, it greatly simplifies hardware initialization and provides pre-built driver support.

Changelog

Version	Date	Notes
V1.4.3	Mar 2023	Latest stable release
V1.4.0	Earlier	Added T-Watch-S3 branch support
V1.0.0	Early 2019	Initial release