The single-chip microcomputer adopts ST STM32F103C8 ARM Cortex M3 32-bit 72 MHz. 128 KB flash memory. 20 KB running memory. The performance is much stronger than the Atmega 328P 8bit 16Mhz AVR microcontroller used by the general Arduino Uno. The interface is compatible with the Arduino Uno standard. It can be developed with Arduino IDE development environment. There are dual Micro USB ports onboard, one of which is a USB to UART serial port, which can be used as a serial port communication and debugging program. Another USB port is directly connected to the USB port of STM32. The board also provides a ST-LINK SWD 4-pin interface to connect to STLINK for quick download and debugging. The onboard RTC real-time clock backup battery can retain time and alarm wake-up functions after power off.