STM32F103C8T6 Blue Pill Development Board

STM32F103C8T6 is one of the mid-range microcontroller units of the STM32F103x8 family based on RISC architecture. An integrated Blue Pill Development Board was introduced as a low-cost board as an alternative to STMicroelectronics STM discovery boards. The price of Blue Pill is around 2-3$.

STM32F103C8T6 microcontroller comes with GPIO pins, processor, memory, USB port, Analog to Digital Converters, and other peripherals. An ARM Cortex Core with an amazing speed of 72 MHz and remarkable power efficiency.

This tutorial is an introduction to the STM32F103C8T6 Blue Pill Development Board. All the features, specifications, pin configuration, GPIO pins and peripherals, and applications will be discussed here.

STM32F103C8T6 Introduction

STM32F103C8T6 Blue Pill Development Board contains a 32-bit Cortex-M3 RISC ARM core with an internal oscillator of 4 -16 MHz. It is a CMOS flash technology chip. This chip has 37 GPIO pins and 10 Analog pins. It has some modern communication interfaces like a CAN and a USB port. The peripherals give outstanding control of the board as it operates at very low voltage, so it is suitable for low-power applications. It also comes with an integrated watchdog and a window watchdog timer for the proper execution of instructions.

STM32F103C8T6 Blue Pill Development Board

STM32F103C8T6 Blue Pill Pinout

Following diagram shows the pinout of the STM32F103C8T6 Blue Pill Development Board:

STM32F103C8T6 Blue Pill pinout diagram

STM32F103C8T6 Blue Pill Pin Configuration

Let us discuss the pinout of the STM32F103C8T6 Blue Pill Development Board. The pin configuration detail in tabular is mentioned below:

TypePin NameFunction
Power– 3.3 Volts
– 5 Volts
1. Operational Output Voltage
2. Power Supply from USB or 5V external source pin
3. Ground Pin
Analog PinsPA0-PA7, PB0-PB110, 12-bit resolution ADC pins
I/O PinsPA0-PA15, PB0-PB15, PC13-PC1537 General Purpose I/O pins
External InterruptsPA0-PA15, PB0-PB15, PC13-PC15Interrupt pins
PWMPA0-PA3, PA6-PA10, PB0-PB1, PB6-PB915 Pulse-width Modulation pins
Serial Communication ( UART)TX1, RX1, TX2, RX2, TX3, RX3RTS, CTS USART pins
SPIMISO0, MOSI0, SCK0, MISO1, MOSI1, SCK1, CS02 Serial Peripheral Interface pins
CANCAN0TX, CAN0RXController Area Network Bus pins
I2CSCL1, SCL2, SDA1, SD2Inter-Integrated Circuit Serial Data and Clock pins
Built-in LEDPC13LED for Indication
  • External Interrupts: The hardware interrupts are operated to detect external signals.
  • PWM: A total of 15 pulse width modulations pins to generate analog voltage signals from digital PWM outputs.
  • RTS/CTS: Request-to-Send/Clear-to-Send is a protocol that tells about the transmission and reception of data to keep the flow of data and signals in check.
  • SPI: Serial Peripheral Interface to communicate between the Microcontroller Unit and peripherals.
  • CAN: A multi-serial bus also responsible for dual directional communication.
  • I2C: Another serial interface protocol for synchronized bit-wise data transmission.

Features and Specifications

Features and PeripheralsAvailability
Pin Count47
SRAM20 kiloBytes
Serial wire Debug1
Flash Memory64/128 KiloBytes
CPU speed72 MHz (max)
USB ConnectorMicro
Number of Timers7
Communication Interfaces9
USB moduleYes
Operational Temperature-400C – 1050C
Source/Sink Current6 mA
Operational Voltage2.0V – 3.6V
USART module3
Internal Oscillator4-16 MHz
Window watchdog timer (WWDT)Yes
JTAG debug Interface1

Some of the detailed features include :

  • A Cyclic Redundancy Check (CRC) for monitoring the data corruption
  • Three different boot options(through user flash or system memory or SRAM) to reorganize the Flash Memory through USART1
  • 7 different timers for different sampling rates for analog signals
  • A JTAG(Joint Test Action Group) serial protocol for debugging and testing the microcontroller unit
  • A Phase-Locked Loop(PLL) clock for stability by phasing output and input signals
  • A Window watchdog timer for observing the errors in signal reception and transmission

STM32F103C8T6 Blue Pill Schematic Diagram

Following picture shows the schematic diagram for your reference. In case your Blue Pill got damaged, you can refer to this schematic diagram to replace faulty components:

STM32F103C8T6 Blue Pill schematic diagram

How to Program STM32F103C8T6 Development Board

There are two ways to program an STM32F103C8T6 Development Board. By using the following methods :

  • STLink USBDongle
  • External USB or Serial Converter

Support Compilers

There are many options for compilers and IDEs are available to write programs and flash code to STM32F10C8T6 Blue Pill. But these are two the are the most popular and easy to use compilers.

Keil uvision

Softwares like Kiel/CubeMX and STLink’s software are also used to compile and upload programs. This is done through a single wire debug interface which is designed for ARM Cores for the transmissions and Memory access. You can refer to these getting started tutorials on Keil vision:

Arduino IDE

This MCU is compatible with Arduino Software. It can be programmed using Arduino Compilers. Arduino uses two compilers i.e. avr-g++ and arm-none-eabi-g++. The code can be burnt on the MCU using UART1 pins through the external USB.

To program the STM32F10C8T6 through Arduino Software, one must select the required board from the menu of boards provided by the software. Then download suitable files for the board to program efficiently. Sample sketches of Arduino, for example, Blink can be uploaded to the MCU as the development has an integrated LED. Check these Arduino IDE getting started tutorials:


  • Robotics
  • Medical systems
  • Home automation systems
  • Low-cost embedded systems
  • Consumers equipment
  • GPS systems
  • Industrial Applications

2D Diagram

STM32F103C8T6  comes in two packages, i.e. LQFP48, UFQFPN48. The following figure shows the 2d model of UFQFPN48. It shows us the physical dimensions of the components required when a PCB card is designed.

STM32F103C8T6 2D Diagram

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