STM32  (Blue Pill) Minimum Development Board ARM STM32F103C8T6 Module:

Micro Controller:
CS32F103C8T6
Package Type: LQFP;
Number of pins: 48;
Kernel: ARM 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: Support JTAG / SWD debug interface to download, support for IAP.
RT9193: 3.3V regulator chip, the maximum output of 300mA.
Interface description:
SWD interface: Support for simulation, download and debug.
Mirco USB interface: power supply and USB communication, does not support the download.
USART1 interface: USART1 can be used to download the program, or use the USART1 for communication.
MCU pin interface: leads all I / O port pins, easy to connect with peripherals.
5V and 3.3V power input and output interface: commonly used in external power supply, or with other modules for common ground treatment

Other deviceice Description:
Power LED (PWR): Power indicator status, can determine whether the power supply is stable.
The user LED (PC13): to facilitate the I / O output test or indicate the program running.
Start jumping choose programming mode: (1, the user flash memory 2, SRAM 3, system memory).
Reset button: reset chip for the user program.
8M Crystal: The frequency can be set to make the system clocked at 72MHz.
32.768KHz Crystal: Available for built-in RTC, or for calibration.

Arduino compatible:
From Arduino Board manager => Select the desired boards series "Generic STM32F103C series"