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The code bin will demonstrate the basic functionality of T-Watch, including all on-board chips from T-Watch, using the latest lvgl6.0 as the display graphics framework.

Characteristics:

1. The library already contains all the hardware drivers for T-Watch
2. Using TFT_eSPI as the display driver, you can directly call TFT_eSPI through the construction object.
3. Using lvgl 6.0 as the display graphics framework, the driver method has been implemented, you only need to call lvgl api according to your own needs.
4. For the use of lvgl please refer to lvgl docs

Installing

• Download a zipfile from github using the "Download ZIP" button and install it using the IDE ("Sketch" -> "Include Library" -> "Add .ZIP Library..."
• Clone this git repository into your sketchbook/libraries folder. For more info, see https://www.arduino.cc/en/Guide/Libraries

How to find the sample program

• In the Arduino board select TTGO T-Watch
• In the Arduino File -> Examples -> TTGO T-Watch

Note

• If you don't have the TTGO T-Watch option in your board manager, please update the esp32 board as follows:
  • Using Arduino IDE Boards Manager (preferred)
    • Instructions for Boards Manager
  • Using Arduino IDE with the development repository
    • Instructions for Windows
    • Instructions for Mac
    • Instructions for Debian/Ubuntu Linux
    • Instructions for Fedora
    • Instructions for openSUSE

Precautions:

• Since Twatch uses a special IO as the SD interface, please remove the SD card when downloading the program.

About power consumption:

• Currently off the screen, turn off WiFi, Bluetooth and other peripherals consume about 4mA (non-deep sleep), turn on the screen power, do not turn on WiFi, Bluetooth and other peripherals around 65mA, please refer to example -> SimpleWatch for the specific code.

  Off screen power consumption

  

  Open screen power consumption

  

Architecture diagram

3D Shell

Core Board Pinout

TFT

ESP32 Core	GPIO5	GPIO19	GPIO18	GPIO27
ST7789V	CS	MOSI	SCLK	DC

Button

ESP32 Core	GPIO36
User Button	Button

Sensor

ESP32 Core	GPIO21	GPIO22	GPIO39
BMA423	SDA	SCL	Interrupt

PMU

ESP32 Core	GPIO21	GPIO22	GPIO35
AXP202	SDA	SCL	Interrupt

RTC

ESP32 Core	GPIO21	GPIO22	GPIO37
PCF8563	SDA	SCL	Interrupt

TOUCH

ESP32 Core	GPIO23	GPIO32	GPIO38
FT6236U	SDA	SCL	Interrupt

TF Card

ESP32 Core	GPIO13	GPIO15	GPIO2	GPIO14
TF Card	CS	MOSI	MISO	SCLK

Bottom plate Pinout

Standard

ESP32 Core	GPIO33	GPIO25	GPIO21	GPIO22
Standard	Motor	Speaker	SDA	SCL

• Onboard SD card slot

SIM800L

ESP32 Core	GPIO14	GPIO15	GPIO4	GPIO33	GPIO34
SIM800L	RST	PWKEY	BOOST_CTRL	TX	RX

• No onboard SD card slot

MPR121

ESP32 Core	GPIO21	GPIO22
MPR121	SDA	SCL

• Onboard SD card slot

S7XG_Lora & GPS

ESP32 Core	GPIO33	GPIO34
S7XG_Lora	TX	RX

• Onboard SD card slot

More interesting projects:

• Flight Recorder
• TTGO_T_Watch_Baidu_Rec
• TTGO_T_Watch_Alarm_Clock