If this product is out of stock, you may consider buying the original STM32F103C8T6 STM32 ARM Minimum System Development Board Blue Pill.

The HK32F103C8T6 is a high-performance, 32-bit development board based on the ARM Cortex-M3 core, produced by HsuanKa (HK). It is a widely used "clone" or functional equivalent of the STM32F103C8T6 "Blue Pill," designed to be pin-to-pin compatible while offering similar processing power and peripheral sets at a competitive price point.

Specifications

• Core: ARM 32-bit Cortex-M3 CPU.
• Clock Speed: 72MHz maximum frequency.
• Memory: 64KB Flash and 20KB SRAM.
• Operating Voltage: 2.0V to 3.6V DC (Onboard 3.3V regulator included).
• I/O Pins: 37 GPIO pins, many of which are 5V tolerant.
• Communication: 2x I2C, 2x SPI, 3x USART, 1x USB 2.0 Full Speed, and 1x CAN 2.0B.
• ADC: 2x 12-bit Analog-to-Digital Converters.
• Programming: Supports Serial Wire Debug (SWD) and JTAG interfaces.

Features

• Drop-in Compatibility: Features the same "Blue Pill" form factor and pinout as the STM32 version, making it compatible with existing PCB designs and breadboard projects.
• 32-Bit Performance: Provides a significant upgrade over 8-bit microcontrollers (like the ATmega328P) in terms of speed, memory, and peripheral availability.
• Onboard Connectivity: Includes a Micro-USB port for power and serial communication, and a hardware Reset button.
• Boot Selection: Equipped with BOOT0 and BOOT1 jumpers to control whether the device starts from Flash, System Memory, or SRAM.
• Low Power Modes: Supports Sleep, Stop, and Standby modes for battery-efficient applications.

Pin and Header Guide

• V3 / GND: 3.3V Power and Ground pins.
• 5V: 5V Power Input (regulated onboard to 3.3V).
• SWDIO / SWCLK: 4-pin header for programming via ST-Link V2.
• PA0–PA15 / PB0–PB15: Digital and Analog I/O pins supporting PWM, ADC, and communication protocols.
• VBAT: Power input for the internal Real-Time Clock (RTC) and backup registers.

Common Applications

• Embedded Control: Managing complex robotics, motor drivers, and industrial automation tasks.
• IoT Nodes: Acting as a high-speed controller for WiFi, LoRa, or Ethernet-connected sensors.
• USB Devices: Developing custom HID peripherals such as joysticks, keyboards, or MIDI controllers.
• Education: Serving as an affordable platform for learning ARM Cortex-M3 architecture and professional firmware development.

Usage Tips

• Programming Tools: Use an ST-Link V2 programmer for the most reliable experience via the SWD header.
• Software Compatibility: While largely compatible with STM32 libraries (including Arduino IDE support), some low-level registers or timing-specific code may require minor adjustments due to variations in the HK silicon.
• Power Warning: Ensure 5V is only applied to the 5V pin; applying 5V to the 3.3V rail will damage the microcontroller.
• Logic Levels: Most GPIO pins are 3.3V but can tolerate 5V signals, but always verify specific pin labels on the datasheet before connecting high-voltage inputs.