Features: Brand new and high quality 1. Core board based on the most basic MCU circuit, 8M and 32768 crystal circuit, USB power supply circuit. 2. The core board is divided into two rows leading to all I/O ports. 3. With SWD simulation debugging download interface, simple and convenient, fast debugging speed. 4. Uses Mirco USB interface for USB communication and power supply, compatible with common Android phone charger interfaces. 6. Easy to start, more stable. Specifications: Chip: STM32F103C8T6 / STM32F103C6T6 (Optional) Core: ARM 32-bit Cortex-M3 CPU Size: Approx. 22.5mm x 53mm / 0.88 x 2.09in Debugging Mode: SWD Number of Pins: 48 Core: Cortex-M3 Operating Frequency: 72MHz Storage Resources: 64K Byte Flash, 20KByte SRAM Interface Resources: 2x SPI, 3x USART, 2x I2C, 1x CAN, 37x I/O ports Analog-to-Digital Conversion: 2x ADC (12-bit/16-channel) Timers: 3 general timers and 1 advanced timer Debug Download: Supports JTAG/SWD debugging interface for downloading, supports IAP. 2. RT9193: 3.3V regulator chip, maximum output of 300mA. CHIP 32F103C6T6 Descriptions: Interface Description: 1. SWD Interface: Supports simulation, download, and debugging. 2. Mirco USB Interface: Power supply and USB communication, does not support download. 3. USART1 Interface: USART1 can be used to download programs or for communication. 4. MCU Pin Interface: Leads out all I/O port pins, easy to connect to peripherals. 5. 5V and 3.3V Power Input and Output Interfaces: Widely used for external power supply or common ground processing with other modules. Note: Due to lighting effects and shooting angles, there may be slight variations in the product. Please understand. Please allow 0-1 cm error due to manual measurement. Package Includes: 1 PC x STM32F103 System Board