STM32 Blue Pill


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SKU: MCU-STM32-BLUEPILL Category: Tags: ,


The Blue Pill is a development board based on ST Microelectronics? STM32F103C9T6 microcontroller that has an ARM Cortex-M3 core that runs at 72MHz max. Software libraries are available that allow users to program the chip using the Arduino IDE. It is a 32-bit Arduino compatible development board that features the STM32F103C8T6, a member of the STM32 family of ARM Cortex-M3 core microcontrollers. This board aims to bring the 32-bit ARM core microcontrollers to the hobbyist market with the Arduino style form factor.

The Blue Pill has 37 GPIO pins spread across four ports ? A and B (16 pins), C (3 pins) and D (2 pins). Each pin has a current sink/source ability of 6mA. Pull-up and pull-down resistors can be enabled on each of the pins.

Most pins have extra functionality as well:

  • Serial ports ? receive and transmit data via the UART protocol
  • I2C ports ? two-wire communication via the IIC protocol
  • SPI ? serial communication
  • PWM
  • Pin 13 has a built-in LED



  • Input voltage : 5V
  • Operating voltage : 3.3V
  • 10 Analog inputs
  • 37 Digital IO pins
  • Maximum current per pin : 6mA
  • 64/128 KB Flash memory
  • 20KB SRAM memory
  • 72MHz clock speed
  • Support I2C, SPI, UART, CAN, USB communications


This is the comparison between Arduino Uno and STM32 blue pill.

Blue Pill vs. Arduino Uno

Parameter Arduino Uno Blue Pill
Processor ATMega328P STM32F103C8T6
Operating voltage 5 V 3.3 V
CPU speed 16 MHz 72 MHz
Analog pins 8 10
Digital IO pin 14 37
EEPROM / SRAM 1/2 -/20
Flash 32K 64/128K
USB Connector Type B Micro
UART 1 3
SPI 1 2
I2C 1 2



** The product images are for illustration purposes only, this module comes with unsoldered header pins, kindly contact us if you need soldering help **

Additional information

Weight 8 g
Dimensions 55 × 20 × 10 mm


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