AdvancedWatch

From scratch in Eclipse

T-Watch is an ESP32-based smart watch hardware designed by Shenzhen Xinyuan Electronics Co., Ltd. Hardware configuration with main core SOC (ESP32), 16MBytes large flash, 8MBytes external SPRAM, integrated multi-channel programmable power management chip ( AXP202), onboard three-axis accelerometer (BMA423), built-in step counter algorithm and other multi-function GSensor, with a variety of different configurations of internal replaceable backplane, such as LORA, GPS, SIM, SD

PinOut

Name	Pins
TFT CS	5
TFT SCLK	18
TFT MOSI	19
TFT MISO	-1
TFT DC	27
TFT RST	-1
TFT BL	12
SD CS	13
SD MOSI	15
SD MISO	2
SD SCLK	14
TOUCH SDA	23
TOUCH SCL	32
SENSOR SDA	21
SENSOR SCL	22
UART TX	33
UART RX	34
USER BUTTON	36
RTC INT	37
TOUCH INT	38
AXP202 INT	35
BMA423 INT	39

Button description:

PEK KEY: facing the screen, right upper right

• (on state) -> long press for four seconds to shut down
• (off state) -> long press for three seconds to boot

USER KEY : Close to the Type-C interface

• (on state) -> long press for two seconds to release, deep sleep

Note:

• BLE only supports the corresponding UUID of the connection and cannot connect to the UUID that does not exist in the program. BLE server reference code Soil-BLE-Server

• WIFI connection is only used as time synchronization

• AXP202X_Library will have set the DCDC3 output enable to normally open, because DCDC3 will supply power to the ESP32 main chip. If using other methods of control, please be careful not to turn off DCDC3, otherwise it will not be able to burn the program.

Known issue

• Updating the GPS information screen for a long time will cause the program to run away
• BLE connection sometimes causes the program to run away
• The S7XG module only implements ping-pong sending and receiving, and the LORAWALN function is not implemented. For details, refer to the example in the datasheet.

Low power consumption:

• In standby mode (using the M6/M8 GPS module backplane), the display is off and the current minimum power consumption is approximately ~3 mA. Detailed step reference code closes the screen section

Resource

• BMA423 Datasheet
• PCF8563 Datasheet
• ESP32 Datasheet
• AXP202 Datasheet
• LCD Datasheet
• FT5206 Datasheet

Using library files

• TFT_eSPI
• TinyGPSPlus
• lvgl
• FT5206_Library
• AXP202X_Library
• PCF8563_Library
• BMA423_Library
• S7xG_Library
• Button2

Architecture diagram

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

S7XG_Lora & GPS

ESP32 Core	GPIO33	GPIO34
S7XG_Lora	TX	RX

• Onboard SD card slot