STM32F103 Microcontroller: Features, Applications & 'Blue Pill' Board

The STM32F103 is a microcontroller from STMicroelectronics based on the ARM Cortex-M3 core. It offers a range of features including up to 128KB of flash memory, up to 20KB of SRAM, up to 72MHz clock speed, and a variety of communication interfaces such as I2C, SPI, USART, and USB. The STM32F103 is widely used in applications such as industrial control, automotive, medical equipment, and consumer electronics. It is also known as the 'Blue Pill' due to the popular development board based on this microcontroller.