Fish tank controller with STM32F103ZET6

UART1: Bluetooth module

UART2: Wifi moudle

UART3: Ultrasound module

I2C1: EEPROM, for setting

I2C2:

SPI1: SPI flash(16MB)

SPI2:

SPI3:

DS18B20: Use TIM5 as us delay

LCD Backlight PWM: Use TIM?