Th3maz1ng/W800_Smart_Watch
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W800_Smart_Watch/README.md

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W800_Smart_Watch

Why this project :

A Smart Watch project using the Chinese W800 SOC.

The W800 is a pretty interesting chip with impressive characteristics :

Core :

  • 32bit XT804 CPU
  • 240 Mhz frequency

Memory :

  • 2 MB on chip flash
  • 288 KB RAM

Wireless connectivity :

  • Bluetooth EDR(Classic) and BLE 4.2
  • WiFi 2.4Ghz 802.11 b/g/n

Sensors :

The goal is to embed the following sensors in the watch :

  • An accelerometer (for wrist tilt detection, single and double tap detection , foot step counting and more) Possible choices :
    • ADXL345
    • MPU6050
    • BMI160
    • LSM6DS3
    • BMA456 <-- SELECTED i2c addr : 0x18 or 0x19 7 bit address, has the wrist tilt detection feature.
  • A magnetometer (possible choices):
    • HMC5883L <-- SELECTED i2c addr : 0x1E 7 bit address, better soldering footprint
    • QMC5883L
    • LSM303DLHC
    • BMM150 <-- Package with balls, hard to handle
  • An air pressure/temperature sensor (to display the altitude for example)
    • BMP280 <-- SELECTED i2c addr : 0x76 or 0x77

Actuators :

  • A vibration motor to notify events to the user.

Power source :

  • 1 cell lipo battery
  • A charge controller

Screen + touch element :

  • Screen with touch : STP240240_R130A1(T), SPI interface 240*240 px, ST7789V driver.
  • Touch element i2c addr : 0x46, IT7257 I2C touch driver

MCU Pin assignement table :

Pin Number Pin Name Type Function Pull UP/DOWN Connected to Comment
PB_20 I/O UART0_RX/PWM1/UART1_CTS/I²C_SCL U/D
PB_19 I/O UART0_TX/PWM0/UART1_RTS/I²C_SDA U/D
WAKEUP I External Wake Up Pin D The chip is waken up when the pin is HIGH
RESET I Reset Pin D
XTAL_OUT O External crystal output
XTAL_IN I External crystal input
AVDD3V3 P Chip power supply, 3.3V
ANT I/O RF Antenna
AVDD3V3 P Chip power supply, 3.3V
AVDD3V3 P Chip power supply, 3.3V
AVDD3V3_AUX P Chip power supply, 3.3V
TEST I Test function configuration pin
BOOTMODE I/O BOOTMODE and I²S_MCLK/LSPI_CS/PWM2/I²S_DO U/D
PA_1 I/O JTAG_CK/I²C_SCL/PWM3/I²S_LRCK/ADC0 U/D
PA_4 I/O JTAG_SWO/I²C_SDA/PWM4/I²S_BCK/ADC1 U/D
PA_7 I/O PWM4/LSPI_MOSI/I²S_MCK/I²S_DI/Touch0 U/D
VDD3V3IO P IO power supply, 3.3V
PB_0 I/O PWM0/LSPI_MISO/UART3_TX/PSRAM_CK/Touch3 U/D
PB_1 I/O PWM1/LSPI_CK/UART3_RX/PSRAM_CS/Touch4 U/D
PB_2 I/O PWM2/LSPI_CK/UART2_TX/PSRAM_D0/Touch5 U/D
PB_3 I/O PWM3/LSPI_MISO/UART2_RX/PSRAM_D1/Touch6 U/D
PB_4 I/O LSPI_CS/UART2_RTS/UART4_TX/PSRAM_D2/Touch7 U/D
PB_5 I/O LSPI_MOSI/UART2_CTS/UART4_RX/PSRAM_D3/Touch8 U/D
VDD3V3IO P IO power supply, 3.3V
CAP I External capacitor, 4.7µF
PB_6 I/O UART1_TX/MMC_CLK/HSPI_CK/SDIO_CK/Touch9 U/D
PB_7 I/O UART1_RX/MMC_CMD/HSPI_INT/SDIO_CMD/Touch10 U/D
PB_8 I/O I²S_BCK/MMC_D0/PWM_BREAK/SDIO_D0/Touch11 U/D
PB_9 I/O I²S_LRCK/MMC_D1/HSPI_CS/SDIO_D1/Touch12 U/D
PB_10 I/O I²S_DI/MMC_D2/HSPI_DI/SDIO_D2 U/D
VDD3V3IO P IO power supply, 3.3V
PB_11 I/O I²S_DO/MMC_D3/HSPI_DO/SDIO_D3 U/D
GND P Ground (Central Pad)