The CH32V003 Nano Development Board RISC-V Type-C is an ultra-low-cost, entry-level microcontroller development board built around the WCH (WinChipHead) CH32V003F4P6 32-bit RISC-V microcontroller. Featuring an modern reversible USB Type-C connector for 5V power input and a compact breadboard-friendly form factor, it exposes all primary GPIOs, analog inputs, and serial communication buses onto dual 2.54mm pitch pin headers. Powered by the QingKe 32-bit RISC-V2A core operating at clock frequencies up to 48 MHz, the board integrates 16KB of Flash memory, 2KB of SRAM, a 10-bit ADC, a 1-Wire Single-Wire Serial Debug Interface (SDI), and multiple advanced timers. It serves as an ultra-economical, high-performance alternative to traditional 8-bit microcontrollers (like the STM8S003 or ATmega328P) for IoT nodes, sensor interfaces, DIY robotics, educational STEM kits, and high-volume embedded control systems.

Specifications

• Core Microcontroller: WCH CH32V003F4P6 (QingKe 32-bit RISC-V2A Core)
• Instruction Set Architecture: RV32EC (RV32E with Compressed Instructions and 2-level interrupt nesting)
• Maximum Clock Frequency: Up to 48 MHz (Internal high-speed HSI oscillator)
• Flash Program Memory: 16 KB Flash Memory
• SRAM Data Memory: 2 KB High-Speed Static RAM
• USB Interface: USB Type-C Female Port (Dedicated for 5V DC power supply)
• Input Operating Voltage: 5.0V DC via USB Type-C or 3.3V / 5.0V via Header Pins
• Operating Supply Voltage (MCU Core): 3.3V to 5.0V DC (Supports native 3.3V and 5.0V operation)
• Onboard Voltage Regulator: Low-Dropout (LDO) 3.3V linear regulator (AMS1117-3.3 or ME6211)
• General Purpose I/O (GPIO): Up to 18 Multiplexed I/O pins broken out onto standard headers
• Analog-to-Digital Converter (ADC): 10-bit Successive Approximation ADC with up to 8 multiplexed channels
• Timer Resources:
  • 1× 16-bit Advanced Control Timer (TIM1) with complementary PWM output, dead-time insertion, and emergency brake
  • 1× 16-bit General-Purpose Timer (TIM2) with Input Capture / Output Compare / PWM
  • Watchdog Timers (Independent Watchdog & Window Watchdog) and System Tick Timer
• Serial Communication Peripherals:
  • 1× USART (Universal Synchronous/Asynchronous Receiver-Transmitter) with hardware flow control
  • 1× I2C Interface (Supports Standard 100kHz and Fast 400kHz modes)
  • 1× SPI Interface (Master / Slave serial peripheral interface)
• Debug & Programming Interface: 1-Wire Single-Wire Debug Interface (SDI / SWIO via WCH-LinkE programmer)
• Onboard User Elements: Power Status LED (PWR), User Programmable LED (LED/PD6 or PD4), and Reset Push-Button (RST)
• Form Factor & Pin Pitch: Standard Dual-In-Line Breadboard Friendly Form Factor, 2.54 mm (0.1-inch) header pitch
• Operating Ambient Temperature: -40°C to +85°C
• Dimensions: Approximately 38.0 mm × 18.0 mm × 4.5 mm ±0.5 mm

Features

• High-Performance 32-bit RISC-V Processing: QingKe 32-bit RISC-V2A core executes instructions with high compute efficiency, easily outperforming standard 8-bit microcontrollers at a fraction of the hardware cost.
• Modern USB Type-C Power Input: Standard reversible Type-C connector allows convenient powering from computer USB ports, standard 5V phone chargers, or USB power banks without cable orientation hassle.
• Native 3.3V / 5V Wide Voltage Operation: Operates stably across 3.3V and 5.0V power rails, simplifying direct interfacing with both 5V legacy sensors/relays and modern 3.3V digital modules without logic level shifters.
• 1-Wire Fast SDI Programming: Features single-wire debug/programming (SWIO) protocol requiring only one data pin and ground to achieve hardware breakpointing, single-stepping, and flashing.
• Rich Peripheral Complement: Includes a 10-bit ADC, advanced complementary PWM timers, I2C, SPI, and high-speed USART channels for flexible analog and digital sensor integration.
• Extensive Software Ecosystem Support: Compatible with official MounRiver Studio IDE (GCC toolchain), Arduino IDE (via open-source ch32v003 core), and PlatformIO / VS Code for open-source embedded development.

Common Applications

• STEM & Educational Robotics Kits: Microcontroller platform for small obstacle-avoiding mobile robots, spider robots, and servo-controlled educational arms.
• Smart Home & IoT Sensor Nodes: Low-cost reading and preprocessing for digital temperature/humidity sensors (DHT11/DHT22), ultrasonic distance sensors, and light sensors.
• Motor & Actuator Control: Complementary PWM generation for small BLDC drivers, DC motor H-bridges, and multi-channel servo controllers.
• Replacement for Legacy 8-bit MCUs: Direct low-cost upgrade path for legacy applications using STM8S003, ATtiny series, or PIC16 series microcontrollers.
• Custom User Interface Panels: Button matrix scanners, rotary encoder interfaces, and multi-segment LED display drivers.

Usage Tips

• Programmer Requirement (WCH-LinkE): The onboard USB Type-C port is strictly for 5V power and does not feature a built-in USB-to-UART/JTAG chip. To upload code and debug, connect an external **WCH-LinkE (or compatible 1-wire SDI programmer)** to the board's **SWIO (Pin PD1)**, **GND**, and **3.3V/5V** pins.
• Enable SDI Multiplexing Carefully: Pin PD1 is dedicated as the Single-Wire Debug (SWIO) line. Avoid configuring Pin PD1 as a standard GPIO output in software unless you have implemented a delay at startup; disabling SDI on boot can prevent the programmer from establishing a debug connection without a hardware reset sequence.
• Arduino IDE Board Package Installation: In Arduino IDE, add the official open-source **CH32V (WCH)** third-party core URL into the Additional Boards Manager URLs settings to compile and upload standard Arduino sketches.
• Bypass & Decoupling Capacitors: When integrating the Nano board into custom sensor carrier boards or robotics platforms, place a 100nF ceramic capacitor close to external analog sensor input pins to stabilize 10-bit ADC sampling against motor electrical noise.
• Reset Pin (NRST / PD7): The NRST pin has an internal weak pull-up. If using external reset circuits or reset buttons, keep wiring traces short to avoid accidental system resets in high-EMI motor control environments.

Datasheet